Dust removal arrangement optimization structure of dry quenching system

Abstract

The invention belongs to the technical field of dry quenching equipment, and particularly relates to a dust removal arrangement optimization structure of a dry quenching system, which is characterized in that the central axis of a closed-loop flue is always kept at equal height and continuous; an L-shaped flow channel is formed in an inner cavity of the primary dust remover and comprises a long first cavity section and a short second cavity section, an air inlet is formed in the end of the first cavity section, an air outlet is formed in the end of the second cavity section, a bias flow retaining wall is arranged at the joint of the first cavity section and the second cavity section, and the bias flow retaining wall is located on the inner angle side of the joint. And an air inlet and an air outlet of the secondary dust remover are positioned on the same axis. The invention has the following beneficial effects: after the primary dust remover is improved, the retention time of dust-containing gas is prolonged by more than 80%, the retaining wall increases the function of centrifugal dust removal, the separation efficiency of large-particle coke powder is improved from conventional 30% to about more than 60%, large-particle impurities entering the waste heat boiler and the secondary dust remover are greatly reduced, the pipe explosion frequency of the waste heat boiler is greatly reduced, and the service life of the waste heat boiler is prolonged. Meanwhile, the abrasion of the circulating fan is prevented.

Description

Technical Field

[0001] This invention belongs to the technical field of dry quenching equipment, and particularly relates to an optimized structure for dust removal arrangement in a dry quenching system. Background Technology

[0002] Dry quenching (CDQ) is currently the mainstream energy-saving and consumption-reducing technology in the coking industry. It cools red-hot coke with inert gas (usually nitrogen) and recovers the sensible heat of the coke to generate steam, offering both environmental protection and energy recovery benefits. In a dry quenching system, the primary dust collector is a crucial component. Dust-laden inert gas discharged from the dry quenching furnace undergoes coarse dust removal in the primary dust collector before entering the waste heat boiler. It then passes through a secondary dust collector for further dust removal before entering the circulating fan. The dust removal efficiency of the primary dust collector should ensure that the waste heat boiler tubes do not experience severe wear, and the dust removal efficiency of the secondary dust collector should ensure that the circulating fan does not experience severe wear.

[0003] In existing dry quenching systems, the primary and secondary dust collectors have the following shortcomings: 1) Limited dust removal efficiency of the primary dust collector: In conventional primary dust collectors, the residence time of dust-laden gas within the equipment is insufficient, preventing large coke particles from settling or separating sufficiently, thus failing to improve dust removal efficiency. This results in the dust concentration entering the waste heat boiler being difficult to reduce to a very low level, which is detrimental to preventing wear on the waste heat boiler. 2) Insufficient dust removal stability of the secondary dust collector: Existing secondary dust collectors are mostly of a "side-in, side-out" or "side-in, top-out" structure. After entering the equipment, the dust-laden gas needs to be redirected, which easily leads to uneven airflow distribution in the dust removal area, affecting the stability of fine dust removal efficiency. Therefore, optimizing the arrangement of the primary and secondary dust collectors in the dry quenching system to improve dust removal efficiency and better protect the waste heat boiler and circulating fan has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide an optimized dust removal arrangement structure for a dry quenching coke system, overcoming the shortcomings of the prior art, improving the initial dust removal efficiency of the primary dust collector, reducing large coke particles entering the waste heat boiler and secondary dust collector; ensuring uniform airflow distribution in the secondary dust collector, improving fine dust removal efficiency, and reducing the concentration of coke particles entering the circulating fan.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An optimized dust removal layout structure for a dry quenching coke system is disclosed. In this system, which comprises a dry quenching furnace, a primary dust collector, a waste heat boiler, a secondary dust collector, a circulating fan, and a heat pipe heat exchanger, the flue gas outlet of the heat pipe heat exchanger is connected to the air supply inlet of the dry quenching furnace. All equipment is connected end-to-end to form a closed-loop flue. The central axis of the closed-loop flue remains at the same height and is continuous. The inner cavity of the primary dust collector forms an L-shaped flow channel, including a long first cavity section and a short second cavity section. An air inlet is located at the end of the first cavity section, and an air outlet is located at the end of the second cavity section. A flow deflector is located at the connection between the first and second cavity sections, and the flow deflector is tightly connected to the inner corner of the connection. The air inlet and outlet of the secondary dust collector are located on the same axis.

[0006] Furthermore, the area of ​​the deflector wall is not less than 1 / 2 of the cross-sectional area at the connection between the first cavity segment and the second cavity segment.

[0007] Furthermore, the circulating gas inlet and outlet of the dry quenching furnace are bottom-inlet and top-outlet, with the angle between the inlet and outlet planes being ≥90°.

[0008] Furthermore, the circulating gas inlet and outlet of the waste heat boiler are top-inlet and bottom-outlet, with an angle of 90° between the inlet and outlet planes.

[0009] Furthermore, the circulating fan is a double-suction centrifugal fan with double supports.

[0010] Furthermore, the secondary dust collector is a multi-tube cyclone dust collector.

[0011] Furthermore, the primary dust collector is a gravity dust collector, with conical dust collection hoppers respectively provided at the bottom of the first and second chambers.

[0012] Furthermore, three or more process baffles are evenly arranged along the length of the flue in the first cavity section, with adjacent process baffles alternately arranged at the top and bottom of the flue, so that the flue gas in the flue forms a tortuous path when flowing through the process baffles.

[0013] Furthermore, the height of the process barrier is not less than 1 / 2 of the net height of the flue in the first cavity section.

[0014] Furthermore, the spacing between adjacent process retaining walls is 500-1500mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1) Improved dust removal efficiency and extended equipment life. After the primary dust collector was improved, the residence time of dust-laden gas was extended by more than 80%. The baffle wall added the function of centrifugal dust removal. The separation efficiency of large particles of coke powder was increased from the conventional 30% to about 60% or more. This greatly reduced the large particles of impurities entering the waste heat boiler and the secondary dust collector, significantly reduced the frequency of waste heat boiler tube rupture, and prevented the wear of the circulating fan. 2) The airflow distribution has been optimized to stabilize the dust removal effect. The coaxial air intake and exhaust design of the secondary dust collector improves the uniformity of airflow distribution in the cyclone dust removal area by 20-30%, ensuring that the fine dust removal efficiency is stable at over 98% (conventional layouts are prone to efficiency drops of about 3-4% due to uneven airflow). Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 yes Figure 1 The cross-sectional view along line AA shows the section of the first cavity segment; Figure 3 yes Figure 1 The cross-sectional view along line BB shows the section of the second cavity.

[0017] In the diagram: 1-Dry quenching furnace, 2-Primary dust collector, 3-First chamber section, 4-Second chamber section, 5-Deflection baffle wall, 6-Waste heat boiler, 7-Secondary dust collector, 8-Circulating fan, 9-Heat pipe heat exchanger, 10-Process baffle wall, 11-Ash hopper. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of the present invention. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0020] The components of the embodiments of the invention described and shown in the specific embodiments herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] See Figure 1-3This is a schematic diagram of an optimized dust removal layout embodiment of a dry quenching coke system according to the present invention. In the dust removal system, which consists of a dry quenching furnace 1, a primary dust collector 2, a waste heat boiler 6, a secondary dust collector 7, a circulating fan 8, and a heat pipe heat exchanger 9, the flue gas outlet of the heat pipe heat exchanger 9 is connected to the air supply port of the dry quenching furnace 1. All equipment is connected end-to-end to form a closed-loop flue, and the central axis of the closed-loop flue remains at the same height and continuous. The inner cavity of the primary dust collector 2 forms an L-shaped flow channel, including a long first cavity section 3 and a short second cavity section 4. The end of the first cavity section 3 has an air inlet, and the end of the second cavity section 4 has an air outlet. A flow deflector 5 is provided at the connection between the first cavity section 3 and the second cavity section 4. The flow deflector 5 is tightly connected to the inner corner of the connection, and the area of ​​the flow deflector 5 is not less than half the cross-sectional area of ​​the connection between the first cavity section 3 and the second cavity section 4. The air inlet and outlet of the secondary dust collector 7 are located on the same axis. The primary dust collector 2 is a gravity dust collector, with conical dust collection hoppers 11 at the bottom of the first chamber 3 and the second chamber 4, respectively.

[0022] In this embodiment, the circulating gas inlet and outlet of the dry quenching furnace 1 are bottom-in, top-out, with an angle ≥90° between the inlet and outlet planes. The circulating gas inlet and outlet of the waste heat boiler 6 are top-in, bottom-out, with an angle 90° between the inlet and outlet planes. The circulating fan 8 is a double-suction centrifugal fan with double supports. The secondary dust collector 7 is a multi-tube cyclone dust collector.

[0023] In the first section 3, three or more process baffles 10 are evenly arranged along the length of the flue. Adjacent process baffles 10 are alternately arranged at the top and bottom of the flue, so that the flue gas forms a tortuous path when flowing through the process baffles 10. The height of the process baffles 10 is not less than 1 / 2 of the net height of the flue in the first section 3. The spacing between adjacent process baffles 10 is 500-1500mm.

[0024] During operation, the dust concentration in this embodiment of the invention is approximately 30 g / Nm³. 3 The circulating gas enters the primary dust collector 2 from the dry quenching furnace 1. The primary dust collector 2 is a gravity dust collector. The principle of gravity dust collectors is that the longer the flow direction, the better the dust removal effect. Therefore, by arranging three process baffles 10 inside the first chamber section 3, the dust removal efficiency is further improved through the impact and centrifugal force of the three process baffles 3. The circulating gas enters the second chamber section 4 from the first chamber section 3. The deflection baffle 5 blocks part of the outlet of the first chamber section 3, and the opening is far away from the outlet of the second chamber section 4, preventing the circulating gas from flowing towards the outlet side of the second chamber section 4 in the first chamber section 3. Furthermore, the dust removal efficiency is increased through impact and centrifugal force. In this way, the dust concentration in the circulating gas entering the waste heat boiler 6 will be significantly reduced, which, as verified in practice, can be reduced from the conventional 12~18 g / Nm³. 3 Decreased to 6~9 g / Nm 3 This greatly reduces the frequency of tube rupture in waste heat boiler 6.

[0025] The circulating gas enters the secondary dust collector 7 after passing through the waste heat boiler 6. After dust removal by the secondary dust collector, the purified circulating gas enters the circulating fan 8. The inlet and outlet of the secondary dust collector 7 are linear, thus the dust removal efficiency can be improved by at least 3%. In addition, the dust concentration at the inlet is reduced, and the dust concentration of the gas exiting the secondary dust collector 7 can be reduced from <1g / Nm³ before the improvement. 3 Decreased to <0.5g / Nm 3 This can basically eliminate wear and tear on the fan.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optimized structure of a dedusting arrangement of a dry quenching system, in a dedusting system composed of a dry quenching furnace, a primary deduster, a waste heat boiler, a secondary deduster, a circulating fan and a heat pipe heat exchanger, a flue gas outlet of the heat pipe heat exchanger is in communication with a blast inlet of the dry quenching furnace, and the devices are connected in a head-to-tail manner to form a closed loop flue, characterized in that, The central axis of the closed loop flue is always kept at the same height and continuously; the inner cavity of the primary dust collector forms an L-shaped flow channel, including a long first cavity section and a short second cavity section, the end of the first cavity section is provided with an air inlet, the end of the second cavity section is provided with an air outlet, a deflection baffle wall is arranged at the connection between the first cavity section and the second cavity section, and the deflection baffle wall is tightly connected with the inner corner side of the connection; the air inlet and the air outlet of the secondary dust collector are located on the same axis.

2. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, The area of the deflection baffle wall is not less than 1 / 2 of the cross-sectional area of the connection between the first cavity section and the second cavity section.

3. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, The inlet and outlet of the circulating gas of the dry quenching furnace are arranged in a lower-in and upper-out mode, and the included angle between the inlet and the outlet plane is greater than or equal to 90°.

4. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, The inlet and outlet of the circulating gas of the waste heat boiler are arranged in an upper-in and lower-out mode, and the included angle between the inlet and the outlet plane is 90°.

5. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, The circulating fan is a double-suction centrifugal fan with double supports.

6. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, The secondary dust collector is a multi-tube cyclone dust collector.

7. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, The primary dust collector is a gravity dust collector, and a conical dust hopper is arranged at the bottom of the first cavity section and the second cavity section.

8. A dry quenching system dedusting arrangement optimization structure according to claim 1, characterized in that, More than three process baffle walls are uniformly arranged in the first cavity section along the length direction of the flue, and adjacent process baffle walls are alternately arranged at the top and the bottom of the flue, so that the flue gas forms a zigzag path when flowing through the process baffle walls.

9. A dry quenching system dedusting arrangement optimization structure according to claim 8, characterized in that, The height of the process baffle wall is not less than 1 / 2 of the net height of the flue in the first cavity section.

10. A dry quenching system dedusting arrangement optimization structure according to claim 8, characterized in that, The spacing between adjacent process baffle walls is 500-1500 mm.

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