Vertical circulating calcined petroleum coke high-temperature flue gas waste heat recovery system

Abstract

The utility model provides a vertical circulating calcined petroleum coke high-temperature flue gas waste heat recovery system which comprises a vertical hearth (1), a water-cooling cyclone dust collector (3) and a waste heat boiler (5), the inlet end of the vertical hearth (1) is arranged at the bottom, and the outlet end of the vertical hearth (1) is arranged at the top; the inlet end of the vertical hearth (1) is connected with a flue gas inlet, and the outlet end of the vertical hearth (1) is connected with the water-cooling cyclone dust collector (3); and a flue gas outlet (305) of the water-cooling cyclone dust collector (3) is connected to the waste heat boiler (5) through a water-cooling cyclone dust collector outlet flue (4). According to the utility model, the high-temperature flue gas is cooled below the bonding temperature of the flue gas, so that the flue gas becomes solid ash particles, the content of the flue gas is reduced, and favorable conditions are created for subsequent waste heat utilization.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, in particular to a vertical circulating calcined petroleum coke high-temperature flue gas waste heat recovery system. Background Art

[0002] Calcined petroleum coke is a product made by calcining petroleum coke at a high temperature of 1300 degrees without contact with oxygen. It is mainly used for prebaked anodes and cathodes for electrolytic aluminum, accounting for more than 65% of the total calcined coke consumption; followed by recarburizers and graphite electrodes for the metallurgical and steel industries, industrial silicon, yellow phosphorus, and carbon electrodes for ferroalloys.

[0003] Petroleum coke calcination is a critical step in the carbon production process. While the calcination process in a calciner generates heat from the combustion of the volatile components of the petroleum coke, it also produces a large amount of high-temperature flue gas, with temperatures reaching as high as 800-1200°C. Therefore, adding a waste heat steam boiler after the calciner can improve resource utilization during the calcination process, reduce the amount of electricity purchased by the carbon plant, and lower costs. This has extremely important practical and long-term significance for implementing the national energy conservation and emission reduction strategy.

[0004] However, due to the characteristics of petroleum coke calcination, the high-temperature flue gas will directly contact the material, resulting in a large amount of dust and low-ash melting point substances in the discharged high-temperature flue gas. The high-temperature flue gas from the calcination kiln is as high as 1100℃, and the impurities with low ash melting points are in a molten state. If left untreated, these substances will adhere to the heating surface, seriously affecting the heat transfer effect, and will also corrode the heating surface, shortening its service life. In more serious cases, it can cause the heating surface to become blocked, affecting the continuous and stable operation of the entire system. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art, which is achieved specifically through the following technical solutions:

[0006] A vertical circulating calcined petroleum coke high-temperature flue gas waste heat recovery system comprises a vertical furnace, a water-cooled cyclone dust collector and a waste heat boiler, wherein:

[0007] The inlet end of the vertical furnace is arranged at the bottom, and the outlet end is arranged at the top;

[0008] The inlet end of the vertical furnace is connected to the flue gas inlet, and the outlet end of the vertical furnace is connected to the water-cooled cyclone dust collector; the flue gas outlet of the water-cooled cyclone dust collector is connected to the waste heat boiler through the water-cooled cyclone dust collector outlet flue.

[0009] Optionally or preferably, it also includes a return device; the return device is arranged at the bottom of the water-cooled cyclone dust collector; the return device is connected to the bottom of the vertical furnace through an inclined channel; the bottom of the vertical furnace is also provided with an ash hopper, which is used to collect ash box particulate matter.

[0010] Optionally or preferably, the vertical furnace adopts a membrane water-cooled wall structure.

[0011] Optionally or preferably, the water-cooled cyclone dust collector includes an upper cylinder, a lower cylinder and a central cylinder; the upper cylinder is fixed on the top of the lower cylinder and is communicated with the lower cylinder; a flue gas inlet is provided on the upper part of the side wall of the upper cylinder; the central cylinder is fixed on the top of the upper cylinder and is coaxially arranged with the upper cylinder; a flue gas outlet is provided on the top of the central cylinder; and an ash outlet is provided on the bottom of the lower cylinder.

[0012] Optionally or preferably, the upper cylinder is a volute-shaped structure made of membrane water-cooling tube rows; the lower cylinder is a funnel-shaped structure with a larger top and a smaller bottom made of membrane water-cooling tube rows; the membrane water-cooling tube rows are composed of multiple cooling water pipes; and each cooling water pipe is sealed with a steel plate.

[0013] Optionally or preferably, a lower annular header for steam intake is provided at the bottom of the lower cylinder, and an upper annular header for outputting steam-steam mixture is provided at the top of the upper cylinder.

[0014] Optionally or preferably, pins are welded inside the upper cylinder and the lower cylinder, and refractory and wear-resistant castables are laid on the inner surfaces.

[0015] Optionally or preferably, it further includes a fan and a chimney; the fan is connected to the outlet end of the waste heat boiler and can discharge the flue gas passing through the waste heat boiler through the chimney.

[0016] Based on the above technical solution, the beneficial effects of the utility model include:

[0017] (1) The neutral furnace of the utility model can effectively absorb the heat in the high-temperature flue gas, cool the smoke to a temperature below the smoke solidification point, and collect large particles of smoke;

[0018] (2) The water-cooled cyclone dust collector has high collection efficiency. After the large particles of high-temperature dust are collected, the dust content in the flue gas entering the tail convection heating surface is greatly reduced, creating favorable conditions for the subsequent waste heat utilization.

[0019] (3) As part of the evaporation heating surface of the waste heat boiler, the water-cooled cyclone dust collector can reduce the flue gas temperature and absorb waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the system structure of the utility model;

[0022] Figure 2 This is a schematic structural diagram of the water-cooled cyclone dust collector in the utility model;

[0023] Figure 3 This is a flue gas flow diagram of the water-cooled cyclone dust collector in the utility model;

[0024] Figure 4 It is a top view of the upper cylinder in the utility model;

[0025] Description of the accompanying drawings:

[0026] 1- vertical furnace, 2- material return device, 3- water-cooled cyclone dust collector, 4- outlet flue of water-cooled cyclone dust collector, 5- waste heat boiler, 6- dust removal equipment, 7- fan, 8- chimney,

[0027] 101-ash bucket,

[0028] 301-upper cylinder, 302-lower cylinder, 303-center cylinder, 304-smoke inlet, 305-smoke outlet, 306-ash outlet, 307-lower annular header, 308-upper annular header. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0030] In a preferred embodiment, a vertical circulating calcined petroleum coke high temperature flue gas waste heat recovery system is provided, such as Figure 1 As shown, it includes a vertical furnace 1, a water-cooled cyclone dust collector 3 and a waste heat boiler 5, wherein:

[0031] The inlet end of the vertical furnace 1 is arranged at the bottom, and the outlet end is arranged at the top;

[0032] The inlet end of the vertical furnace 1 is connected to the flue gas inlet, and the outlet end of the vertical furnace 1 is connected to the water-cooled cyclone dust collector 3; the flue gas outlet 305 of the water-cooled cyclone dust collector 3 is connected to the waste heat boiler 5 through the water-cooled cyclone dust collector outlet flue 4.

[0033] Furthermore, in this embodiment, a return material device 2 is also included; the return material device 2 is arranged at the bottom of the water-cooled cyclone dust collector 3; the return material device 2 is connected to the bottom of the vertical furnace 1 through an inclined channel 201; the bottom of the vertical furnace 1 is also provided with an ash hopper 101, and the ash hopper 101 is used to collect ash box particulate matter.

[0034] Furthermore, in this embodiment, the vertical furnace 1 adopts a membrane water-cooled wall structure.

[0035] like Figure 2-4 As shown, the water-cooled cyclone dust collector 3 includes an upper cylinder 301, a lower cylinder 302 and a central cylinder 303; the upper cylinder 301 is installed and fixed on the top of the lower cylinder 302 and is connected to the lower cylinder 302; a flue gas inlet 304 is provided on the upper part of the side wall of the upper cylinder 301; the central cylinder 303 is installed and fixed on the top inside the upper cylinder 301 and is coaxially arranged with the upper cylinder; a flue gas outlet 305 is provided on the top of the central cylinder 303; and an ash outlet 306 is provided at the bottom of the lower cylinder 302.

[0036] Furthermore, in this embodiment, the upper cylinder 301 is a volute-shaped structure made of membrane steam cooling tube rows; the lower cylinder 302 is a funnel-shaped structure with a larger upper portion and a smaller lower portion made of membrane steam cooling tube rows; the membrane steam cooling tube rows are composed of multiple cooling steam pipes; and each of the cooling steam pipes is sealed with a steel plate.

[0037] Furthermore, in this embodiment, a lower annular header 307 for steam intake is provided at the bottom of the lower cylinder 302, and an upper annular header 308 for outputting steam-steam mixture is provided at the top of the upper cylinder 301.

[0038] Furthermore, in this embodiment, pins are welded inside the upper cylinder 301 and the lower cylinder 302, and refractory and wear-resistant castables are laid on the inner surfaces.

[0039] Furthermore, in this embodiment, a fan 7 and a chimney 8 are also included; the fan 7 is connected to the outlet end of the waste heat boiler 5 and can discharge the flue gas passing through the waste heat boiler 5 through the chimney 8.

[0040] The usage process and working principle of this embodiment are as follows:

[0041] The high-temperature flue gas at the outlet of calcined petroleum coke is about 1100℃. After being cooled to 850-900℃ by the vertical furnace 1, it enters the water-cooled cyclone dust collector 3. Through the separation effect of the water-cooled cyclone dust collector 3, large particles of dust in the flue gas are collected, and the dust is sent back to the vertical furnace 1 by the return device 2 for circulation cooling. The low-concentration dust flue gas after separation is led to the waste heat boiler 5 from the flue duct 4 at the outlet of the water-cooled cyclone dust collector, and enters the subsequent dust removal equipment 6 and chimney 8 after medium and low temperature heat exchange.

[0042] The vertical furnace 1 serves as the primary dust removal device, while the water-cooled cyclone dust collector 3 serves as the secondary dust removal device. High-temperature flue gas carrying dust enters the water-cooled cyclone dust collector 3 through the flue gas inlet 304, separating the dust and high-temperature flue gas. The separated high-temperature dust is discharged through the ash outlet 306, and the separated high-temperature flue gas is discharged through the flue gas outlet 305. The water-cooled cyclone dust collector is densely welded with three pins, and its inner surface is coated with refractory and wear-resistant castable to protect the water-cooled pipe banks within the water-cooled cyclone dust collector.

[0043] The water-cooled cyclone dust collector 3 is part of the evaporation heating surface of the waste heat boiler and shares the same steam-water system with the waste heat boiler 5. A lower annular header 307 for water inlet is provided at the bottom of the membrane water-cooled tube bank body, and an upper annular header 308 for outputting the steam-water mixture is provided at the top.

[0044] This embodiment includes the following technical effects:

[0045] 1) The vertical furnace can effectively absorb the heat in the high-temperature flue gas and cool the smoke to a temperature below the smoke solidification point, thereby collecting large particles of smoke. At the same time, it can also further cool the high-temperature large particles of dust sent into the water-cooled cyclone dust collector to ensure that it is fully solidified and can be collected.

[0046] 2) The water-cooled cyclone dust collector has high collection efficiency. After the large particles of high-temperature dust are collected, the dust content in the flue gas entering the tail convection heating surface is greatly reduced, creating favorable conditions for subsequent waste heat utilization.

[0047] 3) As part of the evaporation heating surface of the waste heat boiler, the water-cooled cyclone dust collector can reduce the flue gas temperature and absorb waste heat;

[0048] 4) The water-cooled cyclone dust collector body includes multiple cooling water pipes arranged longitudinally. The cooling water pipes are sealed with steel plates to form a membrane wall structure with high manufacturing precision and good sealing performance;

[0049] 5) The water-cooled cyclone dust collector and waste heat boiler share the same steam-water system, which is simple and reliable;

[0050] 6) After the large dust particles are separated, the dust concentration in the flue gas can be effectively reduced, and the wear characteristics of the flue gas on the heating surface can be greatly reduced, thereby increasing the flue gas flow rate entering the convection heating surface of the waste heat boiler, improving the heat transfer efficiency and reducing metal consumption;

[0051] 7) The water-cooled cyclone dust collector can also be used as a cooling device to reduce the temperature of the inner surface, protect the refractory and wear-resistant castables in the dust collector, and increase the service life of the castables;

[0052] 8) Vertical layout, compact structure, small footprint and low infrastructure investment.

[0053] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A vertical circulating calcined petroleum coke high temperature flue gas waste heat recovery system, characterized in that: It comprises a vertical furnace (1), a water-cooled cyclone dust collector (3) and a waste heat boiler (5), wherein: The inlet end of the vertical furnace (1) is arranged at the bottom, and the outlet end is arranged at the top; The inlet end of the vertical furnace (1) is connected to the flue gas inlet, and the outlet end of the vertical furnace (1) is connected to the water-cooled cyclone dust collector (3); the flue gas outlet (305) of the water-cooled cyclone dust collector (3) is connected to the waste heat boiler (5) through the water-cooled cyclone dust collector outlet flue (4).

2. The vertical circulation calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 1, characterized in that: The invention also includes a material return device (2); the material return device (2) is arranged at the bottom of the water-cooled cyclone dust collector (3); the material return device (2) is connected to the bottom of the vertical furnace (1) through an inclined channel (201); the bottom of the vertical furnace (1) is also provided with an ash hopper (101), and the ash hopper (101) is used to collect ash box particulate matter.

3. A vertical circulation calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 1 or 2, characterized in that: The vertical furnace (1) adopts a membrane-type water-cooled wall structure.

4. The vertical circulation calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 1, characterized in that: The water-cooled cyclone dust collector (3) comprises an upper cylinder (301), a lower cylinder (302) and a central cylinder (303); the upper cylinder (301) is fixedly mounted on the top of the lower cylinder (302) and is in communication with the lower cylinder (302); a flue gas inlet (304) is provided at the upper portion of the side wall of the upper cylinder (301); the central cylinder (303) is fixedly mounted on the top of the upper cylinder (301) and is coaxially arranged with the upper cylinder; a flue gas outlet (305) is provided at the top of the central cylinder (303); and an ash outlet (306) is provided at the bottom of the lower cylinder (302).

5. The vertical circulation calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 4, characterized in that: The upper cylinder (301) is a volute-shaped structure made of membrane-type water-cooling tube banks; the lower cylinder (302) is a funnel-shaped structure with a larger top and a smaller bottom made of membrane-type water-cooling tube banks; the membrane-type water-cooling tube banks are composed of a plurality of cooling water pipes; and each of the cooling water pipes is sealed with a steel plate.

6. The vertical circulation calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 4, characterized in that: A lower annular header (307) for steam intake is provided at the bottom of the lower cylinder (302), and an upper annular header (308) for outputting steam-steam mixture is provided at the top of the upper cylinder (301).

7. The vertical circulating calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 5, characterized in that: Pins are welded inside the upper cylinder (301) and the lower cylinder (302), and fire-resistant and wear-resistant castables are laid on the inner surfaces.

8. The vertical circulation calcined petroleum coke high-temperature flue gas waste heat recovery system according to claim 1, characterized in that: It also includes a fan (7) and a chimney (8); the fan (7) is connected to the outlet end of the waste heat boiler (5) and can discharge the smoke passing through the waste heat boiler (5) through the chimney (8).

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