Flue gas waste heat utilization system of sintering circular cooler

Abstract

The invention relates to the technical field of sintering circular cooler flue gas waste heat utilization, in particular to a sintering circular cooler flue gas waste heat utilization system. Comprising a sintering circular cooler, a coke heating device and an air inducing device, chimneys are arranged at the tops of a third-section air bellow and a fourth-section air bellow of the sintering circular cooler respectively, and flue gas recovery branch pipes are arranged on the chimneys and communicate with a flue gas recovery header pipe; an outlet of the flue gas recovery header pipe is connected with the air inducing device, and an outlet of the air inducing device is connected with the coke heating device through an air outlet pipe. According to the system provided by the invention, the flue gas recovery branch pipes are arranged on the chimneys of the third-section air bellow and the fourth-section air bellow of the sintering circular cooler, and the flue gas of the third-section air bellow and the fourth-section air bellow is conveyed into the coke heating device through the flue gas recovery main pipe and the air inducing device and is used for drying the iron-making coke, so that the moisture of the coke is reduced by 3-5%; waste heat of flue gas exhausted by the third-section air bellow and the fourth-section air bellow is recycled, energy is saved, and thermal pollution to the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sintering ring cooler flue gas waste heat utilization, in particular to a sintering ring cooler flue gas waste heat utilization system. Background Art

[0002] Sintering ring cooler is a kind of equipment commonly used in the metallurgical industry. It is mainly used to cool and solidify sintered balls (also called sintered ore), as well as to process other powdered materials. Sintered balls are spherical materials made by sintering iron ore or other powdered raw materials. They are used for iron ore reduction, smelting and other metallurgical processes. In steel production, the sintering process is an indispensable part, and the ring cooling process of the sintering machine will generate a lot of waste heat. At present, the high-temperature gas generated by the third and fourth stages of the sintering ring cooler is usually not fully utilized, resulting in energy waste and environmental thermal pollution. Therefore, the development of an effective third and fourth stage waste heat utilization system for the sintering ring cooler has important economic value and environmental significance. Summary of the invention

[0003] The first purpose of the present invention is to provide a sintering ring cooler flue gas waste heat utilization system, which can recycle the three-stage and four-stage flue gas waste heat of the sintering ring cooler, save energy, and reduce environmental thermal pollution.

[0004] The present invention provides a sintering ring cooler flue gas waste heat utilization system, comprising a sintering ring cooler, a coke heating device, and an induced draft device. The tops of the upper wind hoods corresponding to the three-stage wind boxes and the four-stage wind boxes of the sintering ring cooler are respectively provided with chimneys, and the chimneys are provided with flue gas recovery branches, which are connected to the flue gas recovery main pipe; the outlet of the flue gas recovery main pipe is connected to the induced draft device, and the outlet of the induced draft device is connected to the coke heating device through an air outlet pipe.

[0005] Furthermore, a first regulating valve is respectively provided on the chimney of the three-stage wind box and the four-stage wind box, and a second regulating valve is respectively provided on the two flue gas recovery branch pipes.

[0006] Furthermore, the smoke recovery main pipe and the air outlet pipe are both provided with a temperature sensor and a smoke flow sensor.

[0007] Furthermore, the induced draft device includes an induced draft fan, an electric damper and a filtering device.

[0008] Furthermore, the coke heating device comprises an ironmaking coke silo and a blast furnace, and a vibrating screen is provided below the discharge port of the ironmaking coke silo.

[0009] Furthermore, the outlet of the air outlet pipe is provided with a plurality of air outlet branches, and the air outlet branches are provided with a plurality of air outlet holes, and the air outlet holes face the interior of the ironmaking coke silo.

[0010] Furthermore, the air outlet branch pipe is connected to the air outlet pipe via a rotary expansion joint.

[0011] Furthermore, the diameter of the air outlet is 25-35 mm.

[0012] Furthermore, the temperature of the flue gas entering the ironmaking coke silo is adjusted by adjusting the rotation speed of the induced draft fan and the opening of the second regulating valve, so that the heating temperature of the coke is controlled not to exceed 120°C.

[0013] Furthermore, the temperature of the three-stage wind box and the four-stage wind box is not less than 180°C.

[0014] In summary, compared with the prior art, the present invention has the following advantages:

[0015] The technical solution provided by the present invention is to set a flue gas recovery branch pipe on the chimney of the three-stage bellows and the four-stage bellows of the sintering ring cooler, merge the flue gas of the three-stage bellows and the four-stage bellows into the flue gas recovery main pipe through the flue gas recovery branch pipe, and introduce it into the coke heating device through the induced draft device, so as to dry the ironmaking coke and reduce the moisture content of the coke by 3-5%, and recycle the waste heat of the flue gas discharged from the three-stage bellows and the four-stage bellows, so as to save energy and reduce environmental thermal pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a process flow chart of the sintering ring cooler flue gas waste heat utilization system in Example 1 of the present invention.

[0018] Explanation of the reference numerals: 1-sintering ring cooler; 101-three-stage bellows; 102-four-stage bellows; 103-five-stage bellows; 2-chimney; 201-first regulating valve; 3-flue gas recovery branch pipe; 301-second regulating valve; 4-flue gas recovery main pipe; 5-induced draft fan; 6-electric damper; 7-filtering device; 8-air outlet pipe; 9-ironmaking coke silo; 10-vibrating screen. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example

[0023] A sintering ring cooler flue gas waste heat utilization system, such as Figure 1As shown, the sintering ring cooler 1 includes a first-stage bellows, a second-stage bellows, a third-stage bellows 101, a fourth-stage bellows 102, and a fifth-stage bellows 103; wherein the top of the upper wind hood corresponding to the third-stage bellows 101, the fourth-stage bellows 102, and the fifth-stage bellows 103 is respectively provided with a chimney 2, and the flue gas temperature in the third-stage bellows 101 and the fourth-stage bellows 102 is not less than 180°C, and the chimneys 2 of the third-stage bellows 101 and the fourth-stage bellows 102 are respectively provided with a flue gas recovery branch pipe 3, the flue gas recovery branch pipe 3 is connected to the flue gas recovery main pipe 4, the outlet of the flue gas recovery main pipe 4 is connected to the induced draft device, and the outlet of the induced draft device is connected to the coke heating device through the outlet pipe 8. The flue gas recovery main pipe 4 and the outlet pipe 8 are equipped with a temperature sensor and a flue gas flow sensor for detecting the flue gas temperature and flow in the flue gas recovery main pipe 4 and the outlet pipe 8.

[0024] The chimneys 2 of the three-stage wind box 101, the four-stage wind box 102 and the five-stage wind box 103 of the sintering ring cooler 1 are respectively equipped with first regulating valves 201. The first regulating valves 201 of the three-stage wind box 101 and the four-stage wind box 102 are located above the flue gas recovery branch pipe 3. The two flue gas recovery branch pipes 3 are respectively equipped with second regulating valves 301.

[0025] The induced draft device includes an induced draft fan 5, an electric damper 6 and a filter device 7. The filter device 7 is arranged at the front end of the air inlet of the induced draft fan 5, and the electric damper 6 is arranged at the rear end of the air outlet of the induced draft fan 5. The flue gas is introduced into the coke heating device through the induced draft fan 5; the filter device 7 can be a bag filter, an electrostatic precipitator, etc., for removing dust and particulate matter in the flue gas.

[0026] The coke heating device includes an ironmaking coke silo 9 and a blast furnace. The discharge port of the ironmaking coke silo 9 is connected to the blast furnace through a pipeline, and a vibrating screen 10 is also provided at the discharge port of the ironmaking coke silo 9. Several outlet branches are installed at the outlet of the air outlet pipe 8. The outlet branches are installed on the top of the ironmaking coke silo 9. A plurality of air outlet holes are arranged on the outlet branches. The air outlet holes face the inside of the ironmaking coke silo 9. The outlet branches and the air outlet holes are evenly arranged on the top of the ironmaking coke silo 9 to ensure that the flue gas is evenly distributed inside. The aperture of the air outlet hole is maintained at 25-35mm by non-standard drilling. The outlet branch pipe is a mobile structure, and the connection between the outlet branch pipe and the outlet pipe 8 is connected by a rotatable expansion joint.

[0027] First, the temperature requirement for preheating the ironmaking coke is considered to be met. When the temperature exceeds the set parameters, the temperature of the flue gas entering the ironmaking coke silo 9 is adjusted by adjusting the speed of the induced draft fan 5 and the opening of the second regulating valve 301, and the heating temperature of the coke is controlled to remain stable and not exceed 120°C.

[0028] The flue gas from the three-stage bellows 101 and the four-stage bellows 102 of the sintering ring cooler 1 is collected into the flue gas recovery main pipe 4 through the flue gas recovery branch pipe 3, and the flue gas is introduced into the air outlet pipe 8 through the induced draft fan 5, and enters the inside of the ironmaking coke silo 9 through the air outlet hole of the air outlet pipe 8, and dries the coke entering the blast furnace, reducing the moisture content of the coke by 3-5%. When the utilization coefficient of the sintering ring cooler 1 is high and the temperature is high in summer, the air volume sent to the ironmaking coke silo 9 can be adjusted by the electric damper 6 to avoid the risk of silo fire caused by excessive temperature. At the same time, the opening of the first regulating valve 201 is adjusted to appropriately increase the flue gas emission to meet the cooling of the sintered ore to a reasonable temperature.

[0029] The sintering ring cooler flue gas waste heat utilization system provided by the present invention uses the high-temperature flue gas from the third and fourth stages of the sintering ring cooler to dry ironmaking coke, thereby reducing the moisture content of the coke entering the blast furnace by 3-5%, improving the utilization rate of the waste flue gas of the sintering ring cooler, saving energy, and reducing environmental thermal pollution.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sintering ring cooler flue gas waste heat utilization system, characterized in that: The invention comprises a sintering ring cooler (1), a coke heating device and an induced draft device. The tops of the upper wind hoods corresponding to the three-stage wind box (101) and the four-stage wind box (102) of the sintering ring cooler (1) are respectively provided with chimneys (2). The chimneys (2) are provided with smoke recovery branches (3). The smoke recovery branches (3) are connected to a smoke recovery main pipe (4). The outlet of the smoke recovery main pipe (4) is connected to the induced draft device, and the outlet of the induced draft device is connected to the coke heating device via an air outlet pipe (8).

2. The sintering ring cooler flue gas waste heat utilization system according to claim 1 is characterized in that: A first regulating valve (201) is respectively provided on the chimney (2) of the three-stage wind box (101) and the four-stage wind box (102), and a second regulating valve (301) is respectively provided on the two smoke recovery branch pipes (3).

3. The sintering ring cooler flue gas waste heat utilization system according to claim 1 is characterized in that: The smoke recovery main pipe (4) and the air outlet pipe (8) are both provided with a temperature sensor and a smoke flow sensor.

4. The sintering ring cooler flue gas waste heat utilization system according to claim 2 is characterized in that: The air induced device comprises an air induced fan (5), an electric damper (6) and a filtering device (7).

5. The sintering ring cooler flue gas waste heat utilization system according to claim 4 is characterized in that: The coke heating device comprises an ironmaking coke silo (9) and a blast furnace. A vibrating screen (10) is provided below the discharge port of the ironmaking coke silo (9).

6. The sintering ring cooler flue gas waste heat utilization system according to claim 5 is characterized in that: The outlet of the air outlet pipe (8) is provided with a plurality of air outlet branches, and the air outlet branches are provided with a plurality of air outlet holes, and the air outlet holes face the interior of the ironmaking coke silo (9).

7. The sintering ring cooler flue gas waste heat utilization system according to claim 6 is characterized in that: The air outlet branch pipe is connected to the air outlet pipe (8) via a rotary expansion joint.

8. The sintering ring cooler flue gas waste heat utilization system according to claim 6, characterized in that: The diameter of the air outlet is 25-35 mm.

9. The sintering ring cooler flue gas waste heat utilization system according to claim 6, characterized in that: The temperature of the flue gas entering the ironmaking coke silo (9) is adjusted by adjusting the rotation speed of the induced draft fan (5) and the opening of the second regulating valve (301), and the heating temperature of the coke is controlled not to exceed 120°C.

10. The sintering ring cooler flue gas waste heat utilization system according to claim 1, characterized in that: The temperatures of the three-stage wind box (101) and the four-stage wind box (102) are not lower than 180°C.

Images