Calcined petroleum coke high-temperature flue gas waste heat recovery system with water-cooling cyclone dust removal function
By introducing a radiation cooling chamber and a water-cooled cyclone dust collector into the calcined petroleum coke high-temperature flue gas waste heat recovery system, the problem of dust adhesion and corrosion of the heated surface in the high-temperature flue gas is solved, and efficient waste heat recovery and heat transfer efficiency are achieved.
Patent Information
- Application Number
- CN202422098985.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-28
AI Technical Summary
Dust and low ash melting point substances in high-temperature flue gas tend to adhere to and corrode the heated surface during heat transfer, resulting in a decrease in heat transfer efficiency and a shortened life of the heated surface. In severe cases, it may lead to blockage of the heated surface, affecting the stable operation of the system.
The calcined petroleum coke high-temperature flue gas waste heat recovery system with water-cooled cyclone dust removal is adopted, including a radiation cooling chamber and a water-cooled cyclone dust collector. Large particles of dust are separated by radiation cooling and water-cooled cyclone dust collector, the flue gas temperature is reduced and the dust is collected, and the water-cooled cyclone dust collector is used as the evaporation heating surface of the waste heat boiler.
Effectively reduce the flue gas temperature and dust concentration, improve heat transfer efficiency, reduce wear on the heated surface, extend service life, and ensure stable operation of the system.
Smart Images
Figure CN223091060U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waste heat utilization, and particularly relates to a high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal. Background Art
[0002] Calcined petroleum coke is a product obtained by calcining petroleum coke at a high temperature of 1300 degrees without contacting oxygen. It is mainly used for pre-baked anodes and cathodes used in electrolytic aluminum, accounting for more than 65% of the total consumption of calcined coke. Secondly, it is used as carbon additive, graphite electrode for metallurgical steel industry production, carbon electrodes for industrial silicon, yellow phosphorus and ferroalloy, etc.
[0003] As an important process in the carbon production process, when using a calciner to calcine raw materials, the heat generated by the combustion of the volatile components of petroleum coke can not only meet the needs of calcining petroleum coke, but also a large amount of high-temperature flue gas will be generated during the calcination process, and the flue gas temperature can even reach 800 - 1200 °C. Therefore, adding a waste heat steam boiler behind the calciner can improve the resource utilization rate of the calcination process, reduce the externally purchased electricity of the carbon plant, and reduce the cost of the carbon plant. It has extremely important practical and long-term significance for implementing the national energy conservation and emission reduction strategy.
[0004] However, based on the calcination characteristics of petroleum coke, the high-temperature flue gas will be in direct contact with the material, resulting in a large amount of dust and substances with low ash melting point in the discharged high-temperature flue gas. The temperature of the high-temperature flue gas coming out of the calcination kiln is above 1100 °C, and the impurities with low ash melting point are in a molten state. If not treated, these substances will adhere to the heating surface, seriously affecting the heat transfer effect. At the same time, it will also corrode the heating surface and affect the service life of the heating surface. More seriously, it will even cause the blockage of the heating surface and affect the continuous and stable operation of the entire system. Content of the Utility Model
[0005] The purpose of the utility model is to overcome the shortcomings of the prior art, and specifically achieve the purpose through the following technical solutions:
[0006] A high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal, including a radiation cooling chamber, a water-cooled cyclone dust collector and a waste heat boiler, wherein:
[0007] The inlet end of the radiation cooling chamber is connected to the flue gas inlet, and the outlet end of the radiation cooling chamber 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.
[0008] Optionally or preferably, the radiation cooling chamber is of a horizontal cylindrical structure; a plurality of ash hoppers are provided at the bottom of the radiation cooling chamber.
[0009] Optionally or preferably, the radiation cooling chamber adopts a membrane water wall structure.
[0010] Optionally or preferably, the water-cooled cyclone dust collector includes an upper cylinder body, a lower cylinder body and a central cylinder body; the upper cylinder body is fixedly installed on the top of the lower cylinder body and is communicated with the lower cylinder body; a flue gas inlet is arranged at the upper part of the side wall of the upper cylinder body; the central cylinder body is fixedly installed at the top inside the upper cylinder body and is coaxially arranged with the upper cylinder body; a flue gas outlet is arranged at the top of the central cylinder body; an ash outlet is arranged at the bottom of the lower cylinder body.
[0011] Optionally or preferably, the upper cylinder body is a volute-shaped structure made of membrane water-cooled tube rows; the lower cylinder body is a funnel-shaped structure with a large upper part and a small lower part made of membrane water-cooled tube rows; the membrane water-cooled tube rows are composed of multiple cooling water pipes; each of the cooling water pipes is sealed with a steel plate.
[0012] Optionally or preferably, a lower annular header for steam inlet is arranged at the bottom of the lower cylinder body, and an upper annular header for outputting steam-water mixture is arranged at the top of the upper cylinder body.
[0013] Optionally or preferably, pins are welded inside both the upper cylinder body and the lower cylinder body, and refractory wear-resistant castable is laid on the inner surface.
[0014] Optionally or preferably, a fan and a chimney are further included; 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.
[0015] Based on the above technical solutions, the beneficial effects of the present utility model include:
[0016] (1) The radiation cooling chamber of the present utility model can cool the high-temperature flue gas below the adhesion temperature of the soot, turning the soot into solid ash particles;
[0017] (2) By adopting the water-cooled cyclone dust collector, the collection efficiency is high; after the large-particle high-temperature dust is collected, the soot content in the flue gas entering the tail convection heating surface is greatly reduced, creating favorable conditions for subsequent waste heat utilization;
[0018] (3) As a part of the evaporation heating surface of the waste heat boiler, the water-cooled cyclone dust collector can play the role of reducing the flue gas temperature and absorbing waste heat. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0020] Figure 1 Schematic diagram of the system structure of the present utility model;
[0021] Figure 2 Schematic diagram of the structure of the water-cooled cyclone dust collector in the present utility model;
[0022] Figure 3 Flue gas flow chart of the water-cooled cyclone dust collector in the present utility model;
[0023] Figure 4 Top view of the upper cylinder body in the present utility model;
[0024] Explanation of the attached drawings in the figure:
[0025] 1 - Radiation cooling chamber, 2 - Ash removal equipment, 3 - Water-cooled cyclone dust collector, 4 - Outlet flue of the water-cooled cyclone dust collector, 5 - Waste heat boiler, 6 - Dust removal equipment, 7 - Fan, 8 - Chimney,
[0026] 101 - Ash collection hopper,
[0027] 301 - Upper cylinder body, 302 - Lower cylinder body, 303 - Central cylinder body, 304 - Flue gas inlet, 305 - Flue gas outlet, 306 - Ash outlet, 307 - Lower annular header, 308 - Upper annular header. Detailed implementation manners
[0028] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0029] In a preferred embodiment, a waste heat recovery system for high-temperature flue gas of calcined petroleum coke with water-cooled cyclone dust removal is provided. As Figure 1 shown, it includes a radiation cooling chamber 1, a water-cooled cyclone dust collector 3 and a waste heat boiler 5, wherein:
[0030] The inlet end of the radiation cooling chamber 1 is connected to the flue gas inlet, and the outlet end of the radiation cooling chamber 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 outlet flue 4 of the water-cooled cyclone dust collector.
[0031] Furthermore, in this embodiment, the radiation cooling chamber 1 is of a horizontal cylinder structure; a plurality of ash collection hoppers are provided at the bottom of the radiation cooling chamber 1.
[0032] Furthermore, in this embodiment, the radiation cooling chamber 1 adopts a membrane water wall structure.
[0033] As Figures 2 - 4 shown, the water-cooled cyclone dust collector 3 includes an upper cylinder body 301, a lower cylinder body 302 and a central cylinder body 303; the upper cylinder body 301 is installed and fixed at the top of the lower cylinder body 302 and is communicated with the lower cylinder body 302; an upper part of the side wall of the upper cylinder body 301 is provided with a flue gas inlet 305; the central cylinder body 303 is installed and fixed at the top inside the upper cylinder body 301 and is coaxially arranged with the upper cylinder body; a top of the central cylinder body 303 is provided with a flue gas outlet 305; a bottom of the lower cylinder body 302 is provided with an ash outlet 306.
[0034] Further, in this embodiment, the upper cylinder body 301 is a volute-shaped structure made of membrane-type steam-cooled tube rows; the lower cylinder body 302 is a funnel-shaped structure with a larger upper part and a smaller lower part made of membrane-type steam-cooled tube rows; the membrane-type steam-cooled tube rows are composed of multiple cooling steam tubes; each of the cooling steam tubes is sealed by a steel plate.
[0035] Further, in this embodiment, a lower annular header 307 for admitting steam is arranged at the bottom of the lower cylinder body 302, and an upper annular header 308 for outputting steam-air mixture is arranged at the top of the upper cylinder body 301.
[0036] Further, in this embodiment, pins are welded in both the upper cylinder body 301 and the lower cylinder body 302, and refractory wear-resistant castable is laid on the inner surface.
[0037] Further, in this embodiment, it further 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 flue gas passing through the waste heat boiler 5 through the chimney 8.
[0038] The usage process and working principle of this embodiment are as follows:
[0039] The high-temperature flue gas at the outlet of the calcined petroleum coke is about 1100 °C. After being cooled to 850 - 900 °C in the radiation cooling chamber 1, it enters the water-cooled cyclone dust collector 3. Through the separation effect of the water-cooled cyclone dust collector 3, large particulate dust in the flue gas is collected, and the dust is discharged by the ash removal device 2. The separated low-concentration dust flue gas is led from the outlet flue of the water-cooled cyclone dust collector 4 to the waste heat boiler 5, and after medium and low-temperature heat exchange, it enters the subsequent dust removal device 6 and the chimney 8.
[0040] Among them, the radiation cooling chamber 1 is a primary dust removal device, and the water-cooled cyclone dust collector 3 is a secondary dust removal device; the high-temperature flue gas carrying dust enters the water-cooled cyclone dust collector 3 from the flue gas inlet 304, so that the dust and the high-temperature flue gas are separated. The separated high-temperature dust is discharged from the ash outlet 306, and the separated high-temperature flue gas is discharged from the flue gas outlet 305. Dense pins are welded inside the water-cooled cyclone dust collector 3, and refractory wear-resistant castable is laid on its inner surface to protect the water-cooled tube rows inside the water-cooled cyclone dust collector.
[0041] The water-cooled cyclone dust collector 3, as a part of the evaporative heating surface of the waste heat boiler, 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.
[0042] This embodiment has the following technical effects:
[0043] 1) The setting of the radiation cooling chamber can effectively absorb the heat in the high-temperature flue gas, cool the soot below the soot solidification point temperature, and collect the large-particle soot.
[0044] 2) By adopting the water-cooled cyclone dust collector, the collection efficiency is high; after the large-particle high-temperature dust is collected, the soot content in the flue gas entering the tail convection heating surface is greatly reduced, creating favorable conditions for subsequent waste heat utilization.
[0045] 3) As a part of the evaporative heating surface of the waste heat boiler, the water-cooled cyclone dust collector can play the role of reducing the flue gas temperature and absorbing waste heat.
[0046] 4) The water-cooled cyclone dust collector body includes a plurality of longitudinally arranged cooling water pipes, and the cooling water pipes are sealed with steel plates to form a membrane wall structure, which has high manufacturing precision and good sealing performance.
[0047] 5) The water-cooled cyclone dust collector and the waste heat boiler share the same steam-water system, and the system is simple and reliable.
[0048] 6) After the large-particle dust is separated, the dust concentration in the flue gas can be effectively reduced, and the abrasion 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 the metal consumption.
[0049] 7) The water-cooled cyclone dust collector can also be used as a cooling device, which can reduce the temperature of the inner surface, protect the refractory and wear-resistant castable in the dust collector, and improve the service life of the castable.
[0050] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in the relevant field. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.
Claims
1. A post-calcined petroleum coke high-temperature flue gas waste heat recovery system with water-cooled cyclone dust removal, characterized in that, It includes a radiation cooling chamber (1), a water-cooled cyclone dust collector (3) and a waste heat boiler (5), wherein: The inlet end of the radiation cooling chamber (1) is connected to a flue gas inlet, and the outlet end of the radiation cooling chamber (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 a water-cooled cyclone dust collector outlet flue (4).
2. The high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal according to claim 1, wherein: The radiation cooling chamber (1) is of a horizontal cylindrical structure; a plurality of ash hoppers (101) are provided at the bottom of the radiation cooling chamber (1).
3. A high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal according to claim 1 or 2, characterized in that: The radiation cooling chamber (1) adopts a membrane water-cooled wall structure.
4. A high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal according to claim 1, characterized in that: 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 communicated with the lower cylinder (302); a flue gas inlet (304) is provided at the upper part of the side wall of the upper cylinder (301); the central cylinder (303) is installed and fixed at the top inside 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); an ash outlet (306) is provided at the bottom of the lower cylinder (302).
5. The high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal according to claim 4, characterized in that: The upper cylinder (301) is of a volute-shaped structure made of membrane water-cooled tube rows; the lower cylinder (302) is of a funnel-shaped structure with a larger upper part and a smaller lower part made of membrane water-cooled tube rows; the membrane water-cooled tube rows are composed of multiple cooling water pipes; each of the cooling water pipes is sealed with a steel plate.
6. The high-temperature flue gas waste heat recovery system for calcined petroleum coke with water-cooled cyclone dust removal according to claim 4, characterized in that: A lower annular header (307) for steam inlet is provided at the bottom of the lower cylinder (302), and an upper annular header (308) for outputting steam-water mixture is provided at the top of the upper cylinder (301).
7. A post-calcined petroleum coke high-temperature flue gas waste heat recovery system with water-cooled cyclone dust removal according to claim 5, characterized in that: Pins are welded in both the upper cylinder (301) and the lower cylinder (302), and refractory wear-resistant castable is laid on the inner surface.
8. A post-calcined petroleum coke high-temperature flue gas waste heat recovery system with water-cooled cyclone dust removal 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 flue gas passing through the waste heat boiler (5) through the chimney (8).