Sintering flue gas waste heat recovery system

Abstract

The utility model provides a sintering flue gas waste heat recovery system. A flue gas outlet of a sintering circular cooler (1) is connected with a separator flue gas inlet (304) of a water-cooling cyclone separator (3) through a connecting flue (2); a separator flue gas outlet (305) of the water-cooling cyclone separator (3) is connected with a flue gas inlet of the waste heat boiler (5) through a separator outlet flue (4); a flue gas outlet of the waste heat boiler (5) is connected with a recirculation fan (7) through a waste heat boiler outlet flue (6); and the other end of the recirculating fan (7) is connected with an inlet of the sintering circular cooler (1). The sintering ring cooling waste heat flue gas recovery system can completely and fully recover sintering ring cooling waste heat flue gas, and can also guarantee stable and reliable operation of the waste heat recovery system.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering waste heat boilers, in particular to a sintering fume waste heat recovery system. Background Art

[0002] my country is a steel-producing country. Blast furnace ironmaking consumes a lot of energy, especially the sintering process, which accounts for about 15% of the total energy consumption of the enterprise. The waste heat resources of the sintering process account for about 30% of the waste heat of blast furnace ironmaking. If the operating efficiency of the waste heat recovery system can be fully improved and the energy consumption index can be reduced, it can not only save a lot of energy for society and enterprises, but also reduce carbon emissions and thermal pollution.

[0003] At present, the waste heat recovery rate of sintering process in my country is not high. In addition, the average energy consumption of sintering process in my country is 7.2% higher than that of foreign advanced technology. Therefore, there is a lot of room for reducing energy consumption in the sintering process.

[0004] With the research on sintering energy-saving technology, some patent technologies have been developed. The Chinese patent "Combined recovery and power generation system and method of waste heat from sintering machine flue gas and cooler waste gas" (patent number ZL201010523625.8) discloses a combined recovery and power generation system of waste heat from sintering machine flue gas and cooler waste gas, which uses a double-pressure waste heat boiler to recover the waste heat of the ring cooler waste gas to produce medium-pressure main steam and low-pressure supplementary steam, and a single-pressure waste heat boiler to recover the high-temperature section of the sintering machine flue gas to produce medium-pressure main steam with the same parameters as the ring cooler waste heat boiler, and uses a condensing steam supplementary steam turbine generator set to generate power. This method recycles and utilizes the waste heat resources in the sintering process to a certain extent. However, there are still a series of problems caused by the high dust content in the sintering ring cooling flue gas: (1) The flue gas resistance is large during operation and the fan energy consumption is high; (2) The heat exchange device is severely worn, affecting its service life and operational stability; (3) The recirculation fan is severely worn, affecting its service life and operational reliability; (4) Conventional flue gas dust removal devices have large resistance and the sensible heat of the dust is not recovered.

[0005] Therefore, it is necessary to provide a sintering flue gas waste heat recovery system to achieve both complete and sufficient recovery of the sintering ring cooling waste heat flue gas and ensure stable and reliable operation of the waste heat recovery system. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a sintering flue gas waste heat recovery system, which can not only fully recover the sintering ring cooling waste heat flue gas, but also ensure the stable and reliable operation of the waste heat recovery system. The purpose of the utility model is achieved through the following technical solutions:

[0007] A sintering flue gas waste heat recovery system, comprising a sintering ring cooler, a connecting flue, a water-cooled cyclone separator, a separator outlet flue, a waste heat boiler, and a recirculation fan, wherein:

[0008] The flue gas outlet of the sintering ring cooler is connected to the separator flue gas inlet of the water-cooled cyclone separator through a connecting flue; the separator flue gas outlet of the water-cooled cyclone separator is connected to the flue gas inlet of the waste heat boiler through the separator outlet flue; the flue gas outlet of the waste heat boiler is connected to the recirculation fan through the waste heat boiler outlet flue; the other end of the recirculation fan is connected to the inlet of the sintering ring cooler.

[0009] Optionally or preferably, the water-cooled cyclone separator comprises an upper cylinder, a lower cylinder, a central cylinder, a separator smoke inlet, a separator smoke outlet, an ash outlet, a lower annular header, and an upper annular header;

[0010] The separator smoke inlet is arranged at the upper part of the upper cylinder; the central cylinder and the separator smoke outlet are both arranged at the center of the top of the upper cylinder; and the ash outlet is arranged at the bottom of the lower cylinder.

[0011] Optionally or preferably, the upper cylinder and the lower cylinder are both composed of membrane water-cooled tube rows; the upper cylinder is a cylindrical structure; and the lower cylinder is a funnel structure.

[0012] Optionally or preferably, dense pins are welded inside the water-cooled cyclone separator, and a fire-resistant and wear-resistant castable is laid on the inner surface thereof to protect the water-cooled tube row in the water-cooled cyclone separator.

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

[0014] Optionally or preferably, the sintering ring cooler is also connected to a plurality of blowers.

[0015] Optionally or preferably, a mineral material discharge port is provided at one end of the bottom of the sintering ring cooler away from the flue gas outlet.

[0016] Based on the above technical solution, the utility model provides a sintering flue gas waste heat recovery system, which can produce the following technical effects:

[0017] (1) The utility model adopts a water-cooled cyclone separator, which can separate large dust particles in the sintering ring cooling flue gas with high separation efficiency;

[0018] (2) The water-cooled cyclone separator of the utility model can reduce the temperature of the waste heat flue gas and absorb the waste heat of the high-temperature dust after separation;

[0019] (3) The utility model can effectively reduce the dust concentration in the flue gas and significantly reduce the wear characteristics of the flue gas on the heating surface, 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 2 This is a front view of the water-cooled cyclone separator in the utility model;

[0023] Figure 3 It is a top view of the water-cooled cyclone separator in the utility model;

[0024] Figure 4 This is the furnace wall installation diagram of the water-cooled cyclone separator in the utility model;

[0025] Description of the accompanying drawings:

[0026] 1-sintering ring cooler, 2-connecting flue, 3-water-cooled cyclone separator, 4-separator outlet flue, 5-waste heat boiler, 6-waste heat boiler outlet flue, 7-recirculation fan, 8-ash removal equipment, 301-upper cylinder, 302-lower cylinder, 303-center cylinder, 304-separator flue gas inlet, 305-separator flue gas outlet, 306-ash outlet, 307-lower annular header, 308-upper annular header, 309-refractory and wear-resistant castable. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, 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.

[0028] In a preferred embodiment:

[0029] like Figure 1 As shown:

[0030] This embodiment provides a sintering flue gas waste heat recovery system, including a sintering ring cooler 1, a connecting flue 2, a water-cooled cyclone separator 3, a separator outlet flue 4, a waste heat boiler 5, and a recirculation fan 7, wherein:

[0031] The flue gas outlet of the sintering ring cooler 1 is connected to the separator flue gas inlet 304 of the water-cooled cyclone separator 3 through the connecting flue 2; the separator flue gas outlet 305 of the water-cooled cyclone separator 3 is connected to the flue gas inlet of the waste heat boiler 5 through the separator outlet flue 4; the flue gas outlet of the waste heat boiler 5 is connected to the recirculation fan 7 through the waste heat boiler outlet flue 6; the other end of the recirculation fan 7 is connected to the inlet of the sintering ring cooler 1.

[0032] Furthermore, in this embodiment, if Figure 2 and Figure 3 As shown, the water-cooled cyclone separator 3 includes an upper cylinder 301, a lower cylinder 302, a central cylinder 303, a separator smoke inlet 304, a separator smoke outlet 305, an ash outlet 306, a lower annular header 307, and an upper annular header 308;

[0033] The separator flue gas inlet 304 is arranged at the upper part of the upper cylinder 301; the central cylinder 303 and the separator flue gas outlet 305 are both arranged at the center of the top of the upper cylinder 301; the ash outlet 306 is arranged at the bottom of the lower cylinder 302. The sintering ring cooling waste heat flue gas carrying dust enters the water-cooled cyclone separator 3 to separate the dust and high-temperature flue gas. The sensible heat of the separated high-temperature dust is absorbed and cooled by the water-cooled cyclone separator 3, and then discharged from the ash outlet 306. The separated high-temperature flue gas is discharged from the separator flue gas outlet 305 and enters the waste heat boiler.

[0034] Furthermore, in this embodiment, the upper cylinder 301 and the lower cylinder 302 are both composed of membrane water-cooled tube banks; the upper cylinder 301 is a cylindrical structure; and the lower cylinder 302 is a funnel structure.

[0035] Furthermore, in this embodiment, if Figure 4 As shown, dense pins are welded inside the water-cooled cyclone separator 3, and a fire-resistant and wear-resistant castable 309 is laid on the inner surface thereof to protect the water-cooled pipe row in the water-cooled cyclone separator.

[0036] Furthermore, in this embodiment, a lower annular header 307 is provided at the bottom of the water-cooled cyclone separator 3; an upper annular header 308 is provided at the top of the water-cooled cyclone separator 3; the lower annular header 307 is used for water intake; and the upper annular header 308 is used for outputting a steam-water mixture.

[0037] Furthermore, in this embodiment, the sintering ring cooler 1 is also connected to a plurality of blowers.

[0038] Furthermore, in this embodiment, a mineral material discharge port is provided at one end of the bottom of the sintering ring cooler 1 away from the flue gas outlet.

[0039] The use process and working principle of this embodiment are as follows:

[0040] The flue gas (about 450°C) flowing out of the sintering ring cooler 1 is dust-removed and cooled to about 400°C by a water-cooled cyclone separator. The large particles of dust in the flue gas are collected by the separation action of the water-cooled cyclone separator 3, and the dust is discharged by the ash removal equipment 8 at the bottom of the water-cooled cyclone separator 3. The low-concentration dusty flue gas after separation is led to the waste heat boiler from the separator flue gas outlet 305, and after medium and low temperature heat exchange, it enters the sintering ring cooler 1 for recycling by the recycling fan 7.

[0041] The beneficial effects of this embodiment include:

[0042] (1) The water-cooled cyclone separator can separate large dust particles from the sintering ring cooling flue gas with high separation efficiency;

[0043] (2) As part of the evaporation heating surface of the waste heat boiler, the water-cooled cyclone separator can reduce the temperature of the waste heat flue gas and absorb the waste heat of the high-temperature dust after separation;

[0044] (3) The water-cooled cyclone separator body includes a plurality of cooling water pipes arranged longitudinally, 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;

[0045] (4) The water-cooled cyclone separator and the waste heat boiler share the same steam-water system, which is simple and reliable;

[0046] (5) After the large dust particles are separated, the dust concentration in the flue gas can be effectively reduced, which greatly reduces the wear characteristics of the flue gas on the heating surface, 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;

[0047] (6) After the large dust particles are separated, the dust concentration in the flue gas can be effectively reduced, which greatly reduces the wear of the flue gas on the recirculation fan, thereby improving its operating stability and service life;

[0048] (7) The water-cooled cyclone separator can also be used as a cooling device to reduce the temperature of the inner surface, protect the refractory and wear-resistant castable in the separator, and increase the service life of the castable.

[0049] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but 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 the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A sintering flue gas waste heat recovery system, Features: It comprises a sintering ring cooler (1), a connecting flue (2), a water-cooled cyclone separator (3), a separator outlet flue (4), a waste heat boiler (5), and a recirculation fan (7), wherein: The flue gas outlet of the sintering ring cooler (1) is connected to the separator flue gas inlet (304) of the water-cooled cyclone separator (3) through a connecting flue (2); the separator flue gas outlet (305) of the water-cooled cyclone separator (3) is connected to the flue gas inlet of the waste heat boiler (5) through a separator outlet flue (4); the flue gas outlet of the waste heat boiler (5) is connected to a recirculation fan (7) through a waste heat boiler outlet flue (6); the other end of the recirculation fan (7) is connected to the inlet of the sintering ring cooler (1).

2. A sintering flue gas waste heat recovery system according to claim 1, Features: The water-cooled cyclone separator (3) comprises an upper cylinder (301), a lower cylinder (302), a central cylinder (303), a separator smoke inlet (304), a separator smoke outlet (305), an ash outlet (306), a lower annular header (307), and an upper annular header (308); The separator smoke inlet (304) is arranged at the upper part of the upper cylinder (301); the central cylinder (303) and the separator smoke outlet (305) are both arranged at the center of the top of the upper cylinder (301); and the ash outlet (306) is arranged at the bottom of the lower cylinder (302).

3. A sintering flue gas waste heat recovery system according to claim 2, Features: The upper cylinder (301) and the lower cylinder (302) are both composed of membrane water-cooled tube rows; the upper cylinder (301) is a cylindrical structure; and the lower cylinder (302) is a funnel structure.

4. A sintering flue gas waste heat recovery system according to claim 2, Features: The water-cooled cyclone separator (3) is internally welded with dense pins, and its inner surface is coated with fire-resistant and wear-resistant castable material to protect the water-cooled pipe row in the water-cooled cyclone separator.

5. A sintering flue gas waste heat recovery system according to claim 2, Features: A lower annular header (307) is provided at the bottom of the water-cooled cyclone separator (3); an upper annular header (308) is provided at the top of the water-cooled cyclone separator (3); the lower annular header (307) is used for water intake; and the upper annular header (308) is used for outputting a steam-water mixture.

6. A sintering flue gas waste heat recovery system according to claim 1, Features: The sintering ring cooler (1) is also connected to a plurality of blowers.

7. The sintering flue gas waste heat recovery system according to claim 1, Features: A mineral material discharge port is provided at one end of the bottom of the sintering ring cooler (1) away from the flue gas outlet.

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