WO2023138040A1 - Flue of converter waste heat boiler - Google Patents

Abstract

A flue of a converter waste heat boiler, the flue comprising a furnace mouth section flue (3), a skirt (1) and a water cooling ring (2), wherein the furnace mouth section flue (3) is mounted in a high-rise frame above a converter, the water cooling ring (2) has a heating tube I (18), which is annularly arranged, the bottom of the furnace mouth section flue (3) is nested in the heating tube I (18) of the water cooling ring, and a certain gap is reserved between an outer side wall of the furnace mouth section flue (3) and an inner side wall of the heating tube I (18); and the skirt (1) has a heating tube II (8) in the shape of a horn mouth, the heating tube II (8) is arranged in the gap reserved between the furnace mouth section flue (3) and the heating tube I (18), and the heating tube II (8) is vertically movable in the gap. In the present invention, the structure of the flue of a converter waste heat boiler is simple, the skirt (1) is movably arranged between an inner wall of the water cooling ring (2) and an outer wall of the furnace mouth section flue (3), and by means of the inner wall of the water cooling ring (2) and the outer wall of the furnace mouth section flue (3), a guide function during the lifting of the skirt (1) can be achieved, and the aim of sealing flue gas to a certain extent can also be achieved, thereby reducing overflow of the flue gas, and greatly reducing the maintenance workload.

Description

A converter waste heat boiler flue technical field

The invention belongs to the technical field of waste heat boilers, and in particular relates to a waste heat boiler flue of a converter.

Background technique

The converter vaporization flue is to recover the sensible heat of the high-temperature flue gas generated in the converter steelmaking process, and to reduce the flue gas to a certain temperature before sending it to the subsequent dust removal system. Due to the large amount of high-temperature flue gas generated during the converter blowing process, the flue gas temperature is usually as high as 2000 ° C, and the reaction in the converter is intense, and there is a risk of slag splashing. When the converter is blowing oxygen, it is necessary to lower the skirt cover to prevent gas combustion caused by inhaling air, and to lift the skirt cover when the converter is shaking. In order to prevent the skirt cover from being burned and recover the waste heat of the flue gas, the skirt cover adopts a water-cooled structure. Traditionally, the skirt cover and the flue of the furnace mouth section adopt steam seal, nitrogen seal or mechanical seal. Among them, steam seal and nitrogen seal will cause waste of energy. The mechanical seal structure is complex, and the seal is a vulnerable part, and the maintenance workload is heavy.

Contents of the invention

The purpose of the present invention is to provide a converter waste heat boiler flue, which can at least solve some of the defects in the prior art.

To achieve the above object, the present invention adopts the following technical solutions:

A converter waste heat boiler flue, comprising a flue mouth section flue, a skirt cover and a water cooling ring. The mouth section flue is installed in a high-rise frame above the converter. The water cooling ring has a heat receiving tube 1 arranged in a ring shape. In the gap space reserved between the channel and the first heating tube, the second heating tube can move up and down in the gap space.

Further, the water-cooling ring includes a heat receiving pipe 1, a water inlet header 1 and a water outlet header 1, the water inlet header 1 and the water outlet header 1 are arranged outside the heat receiving pipe 1, and the water inlet header 1 and the water outlet header 1 are arranged symmetrically.

Further, the heat receiving pipe 1 is an annular structure with the same inner diameter in the height direction, and the inner and outer walls of the heat receiving pipe 1 are smooth walls.

Further, the skirt cover includes heating pipe 2, water inlet header 2, water outlet header 2 and a lifting guide assembly. The outlet water header 2 and water inlet header 2 are arranged at intervals up and down, and the diameter of the water inlet header 2 is larger than the diameter of the water outlet header 2. Both the outlet water header 2 and the water inlet header 2 are located outside the heating pipe 1 of the water cooling ring. The heating pipe 2 is arranged vertically. Header two connections.

Further, there are multiple sets of lifting guide assemblies arranged at equal intervals along the two circumferential directions of the heat receiving tube.

Further, the lifting guide assembly includes a fixed bracket, a lifting driving part and a lifting power transmission part, the heat receiving pipe 2, the water inlet header 2 and the water outlet header 2 are all fixedly connected to the fixing bracket, and the lifting driving part drives the fixed bracket to move up and down along the height direction of the water cooling ring through the lifting power transmission part.

Further, the lifting guide assembly further includes a guide wheel, the guide wheel is fixedly installed on the fixed bracket, and the guide wheel is arranged close to the outer wall of the water cooling ring.

Further, the top of the heat receiving tube 2 has an outward expansion section extending gradually outward.

Further, the flue at the furnace mouth section includes a heating pipe 3, a water inlet header 3 and a water outlet header 3, and the water inlet header 3 and the water outlet header 3 are respectively connected to the lower part and the upper part of the heating pipe 3.

Further, the heat receiving pipe three includes a vertical section and an inclined section, the vertical section is located outside the heat receiving pipe one, the inclined section is located inside the heat receiving pipe one, the inclined section has a bell mouth structure, and the inclined section has double walls arranged inside and outside, the outer wall of which is a vertical surface, and the inner wall is an inclined surface.

Compared with prior art, the beneficial effect of the present invention:

The converter waste heat boiler flue provided by the present invention has a simple structure. The skirt cover is movably arranged between the inner wall of the water cooling ring and the outer wall of the flue mouth section flue. The inner wall of the water cooling ring and the outer wall of the flue mouth section flue can guide the skirt when it is lifted, and can also play a certain role in sealing the flue gas, reducing the overflow of flue gas, and greatly reducing the maintenance workload.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of the flue structure of the converter waste heat boiler when the skirt cover is in the down cover position in the embodiment of the present invention;

Fig. 2 is a schematic diagram of the flue structure of the converter waste heat boiler when the skirt is in the raised position in the embodiment of the present invention;

Fig. 3 is the structural representation of skirt cover in the embodiment of the present invention;

Fig. 4 is the enlarged schematic diagram of part I in Fig. 3;

Fig. 5 is the top view of skirt cover in the embodiment of the present invention;

Fig. 6 is a schematic structural view of a water cooling ring in an embodiment of the present invention;

Figure 7 is an enlarged schematic view of part A in Figure 6;

Fig. 8 is an enlarged schematic diagram of part B in Fig. 6;

Fig. 9 is a top view of the water cooling ring in the embodiment of the present invention.

Explanation of reference numerals: 1, skirt cover; 2, water cooling ring; 3, flue of furnace mouth section; 4, water outlet header three; 5, heating pipe three; 6, water inlet header three; 7, converter mouth; 8, heating pipe two; One water header; 18, one heating pipe; 19, one water outlet header.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention.

The terms "a", "two", and "three" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Therefore, the features defined as "a", "two", and "three" may explicitly or implicitly include one or more of these features; in the description of the present invention, unless otherwise specified, "plurality" means two or more than two.

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 6, the present embodiment provides a converter waste heat boiler flue, which includes a flue mouth section flue 3, a skirt cover 1 and a water cooling ring 2. The bottom of the flue 3 is nested in the heat receiving pipe 18 of the water cooling ring 2, and there is a certain gap between the outer wall of the furnace mouth section flue 3 and the inner wall of the heat receiving pipe 18. The skirt cover 1 has a bell-shaped heat receiving pipe 2 8. 1), the bottom of the skirt 1 is covered on the converter mouth 7, which can seal the flue gas to a certain extent, and reduce the overflow of flue gas during the converter smelting process; when the furnace needs to be shaken, the skirt 1 is lifted to the cover position (as shown in Figure 2). The converter waste heat boiler flue provided by this embodiment has a simple structure. Through the design of the skirt structure and arrangement, the sealing problem between the skirt and the flue mouth section is effectively solved, and the maintenance workload is small, safe and reliable.

Refined embodiments, as shown in Figure 1 and Figure 2, the furnace port camlet 3 includes heating tube 3 5, water entry box 3: 6, and outlets. The water connected box 3: 6 and the outlet box three 4 are connected to the lower and upper parts of the heating tube 3 5 respectively; optimized, the oxygen gun plug in the furnace of the furnace section, the inlet of the vice oxygen gun input, and the addition of the water -cooled fixture can be set to use it. Ensure the cooling effect of oxygen guns, auxiliary oxygen guns and feeding mouths. Specifically, the third heated pipe 5 includes a vertical section and an inclined section, the vertical section is located outside the heated pipe one 18, the inclined section is located inside the heated pipe one 18, and the inclined section has a bell mouth structure, and the inclined section has double walls arranged inside and outside, the inner wall of which is an inclined surface, and the outer wall is a vertical surface, and a concentric annular chamber is formed between the outer wall and the inner wall of the water cooling ring 2.

A specific embodiment, as shown in Fig. 6, Fig. 7, Fig. 8 and Fig. 9, the water cooling ring 2 includes a heated pipe-18, a water inlet header-17 and a water outlet header-19, the heated pipe-18 is arranged in a ring shape, the inner wall of the heated pipe-18 is vertical, and a concentric annular chamber is formed between the heated pipe-18 and the outer wall of the heated pipe 35 of the flue 3 of the furnace mouth section, and the water inlet-17 and the water outlet-19 are arranged on the heated pipe The outer side of the first 18, and the water inlet header 17 and the water outlet header 19 are arranged symmetrically, the water inlet end of the heating pipe 18 is connected to the water inlet header 17, and the water outlet end of the heating pipe 18 is connected to the water outlet header 19; further, the heating pipe 18 is a ring structure with the same inner diameter in the height direction, and the inner and outer walls of the heating pipe 18 are smooth walls.

As a specific embodiment, as shown in Figure 3, Figure 4, and Figure 5, the skirt 1 includes heating pipe 2 8, water inlet box 2 9, outlets 2 11, and promoting guidance components 10. The interval between the water connecting box 2 11 and the water inlet box 2 9, and the diameter of the water inlet box 2 9 is larger than the diameter of the water joint box 2 11 and the water pilot box 2 9. The outside of the heating tube 1 18, which is located in the water -cooled ring 2. The water connection box 29 is connected, and the output end of the heating tube 28 is connected to the water connection box 2 11. The promotion of the guidance component 10 is used to control the improvement and decline of the skirt 1.

Optimally, the water inlet end and the water outlet end of the heating pipe 2 8 are located at the bottom of the heating pipe 2 8, and the water inlet end and the water outlet end of the heating pipe 2 8 are provided with an outwardly extending bending section 16, which is connected to the water inlet header 9 and the water outlet header 2 11 through the bending section 16, so that the cooling water in the heating pipe 8 of the skirt cover adopts a way of running up and down to use the waste heat of the high-temperature flue gas, which improves the waste heat utilization rate. The structural design further improves the effect of the skirt cover 1 in sealing smoke.

Optimally, the top of the heat receiving pipe 2 8 has an outward expansion section 15 that gradually expands to the outside. Through the design of the external expansion section 15, a certain distance can be maintained between the heat receiving pipe 2 8 and the inner wall of the water cooling ring 2 and the outer wall of the flue 3 of the furnace mouth section, which further plays a guiding role when the skirt cover 1 is raised and lowered.

Specifically, as shown in Figure 5, the lifting guide assembly 10 can be designed into multiple groups, which are arranged at equal intervals along the two to eight circumferential directions of the heat receiving pipes. In this embodiment, four groups of lifting guide assemblies 10 are provided; during the lifting or lowering process of the skirt cover 1, multiple groups of lifting guide assemblies 10 simultaneously provide an active force to the skirt cover 1 to ensure the stability of the skirt cover 1 in the process of lifting or lowering.

In an optional embodiment, the lifting guide assembly 10 includes a fixed bracket 12, a lifting driver (not shown in the figure) and a lifting power transmission member 13. The heating pipe 2 8, the water inlet header 9 and the water outlet header 11 are all fixedly connected to the fixing bracket 12, and the lifting driver drives the fixing bracket 12 to move up and down along the height direction of the water cooling ring 2 through the lifting power transmission part 13, thereby controlling the lifting and lowering of the skirt 1. Wherein, the hoisting device or hydraulic device can be selected as the lifting driving part, and the lifting guide chain or lifting rod can be selected as the lifting power transmission part 13, but the specific selection is not limited thereto.

Preferably, the lifting guide assembly 10 further includes a guide wheel 14, the guide wheel 14 is fixedly installed on the fixed bracket 12, and the guide wheel 14 is arranged close to the outer wall of the water cooling ring 2, and the setting of the guide wheel 14 further ensures the stability of the skirt 1 during lifting.

To sum up, the converter waste heat boiler flue provided by the present invention has a simple structure, and the skirt is movably arranged between the inner wall of the water cooling ring and the outer wall of the flue at the furnace mouth section. The inner wall of the water cooling ring and the outer wall of the flue mouth of the furnace mouth section can guide the skirt when it is lifted, and can also play a certain role in sealing the flue gas, reducing the overflow of flue gas, and greatly reducing the maintenance workload.

The above examples are only illustrations of the present invention, and do not constitute a limitation to the protection scope of the present invention. All designs that are the same as or similar to the present invention fall within the protection scope of the present invention.

Claims (10)

A converter waste heat boiler flue, characterized in that it includes a furnace mouth section flue, a skirt cover and a water cooling ring, the furnace mouth section flue is installed in a high-rise frame above the converter, the water cooling ring has a heat receiving pipe 1 arranged in a ring, the bottom of the furnace mouth section flue is nested in the water cooling ring heat receiving pipe 1, and there is a certain gap between the furnace mouth section flue outer wall and the heat receiving pipe 1 inner wall, the skirt has a trumpet shaped heat receiving pipe 2, and the heat receiving pipe 2 is arranged on the In the gap space left between the flue of the furnace mouth section and the first heating tube, and the second heating tube can move up and down in the gap space. The flue of a converter waste heat boiler according to claim 1, wherein the water-cooling ring includes a heat receiving pipe 1, an inlet water header 1 and an outlet water header 1, and the water inlet header 1 and the water outlet header 1 are arranged outside the heat receiving pipe 1, and the water inlet header 1 and the water outlet header 1 are arranged symmetrically. A converter waste heat boiler flue as claimed in claim 1 or 2, characterized in that: the heat receiving tube 1 is a ring structure with a uniform inner diameter in the height direction, and the inner and outer walls of the heat receiving tube 1 are smooth walls. The flue of a converter waste heat boiler according to claim 1, characterized in that: the skirt cover includes heating tube 2, water inlet header 2, water outlet header 2 and a lifting guide assembly, the outlet water header 2 and water inlet header 2 are spaced up and down, and the diameter of the water inlet header 2 is larger than the diameter of the water outlet header 2, and the outlet water header 2 and the water inlet header 2 are located outside the heated pipe 1 of the water cooling ring. The second box is connected, and the water outlet end of the second heating pipe is connected with the second water outlet header. A converter waste heat boiler flue according to claim 1, characterized in that there are multiple sets of lifting guide assemblies arranged at equal intervals along the two circumferential directions of the heat receiving tube. A converter waste heat boiler flue as claimed in claim 4, characterized in that: the lifting guide assembly includes a fixed bracket, a lifting drive part and a lifting power transmission part, the heat receiving pipe 2, the water inlet header 2 and the water outlet header 2 are all fixedly connected to the fixed bracket, and the lifting drive part drives the fixed bracket to move up and down along the height direction of the water cooling ring through the lifting power transmission part. A converter waste heat boiler flue according to claim 6, characterized in that: said lifting guide assembly further includes a guide wheel, said guide wheel is fixedly installed on a fixed bracket, and the guide wheel is arranged close to the outer wall of said water cooling ring. A converter waste heat boiler flue as claimed in claim 1 or 4, characterized in that: the top of the heat receiving tube 2 has an outward expansion section extending outwards in a gradually expanding shape. The flue of a converter waste heat boiler according to claim 1, characterized in that: the flue at the mouth of the furnace includes a heating pipe 3, a water inlet header 3 and a water outlet header 3, and the water inlet header 3 and the water outlet header 3 are respectively connected to the lower part and the upper part of the heating pipe 3. A converter waste heat boiler flue as claimed in claim 9, characterized in that: said heating tube three includes a vertical section and an inclined section, said vertical section is located outside heating tube one, said inclined section is located inside heating tube one, and the inclined section has a trumpet structure, said inclined section has double-layer walls arranged inside and outside, the outer wall of which is a vertical surface, and the inner wall is an inclined plane.

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