CN210426099U

CN210426099U - Vertical pipe air single-preheating ignition heat preservation furnace

Info

Publication number: CN210426099U
Application number: CN201921618026.7U
Authority: CN
Inventors: 周建二; 周元生; 徐绍春
Original assignee: WUHU MINGCHENG FURNACE INDUSTRY CO LTD
Current assignee: WUHU MINGCHENG FURNACE INDUSTRY CO LTD
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-04-28
Anticipated expiration: 2029-09-26

Abstract

The utility model discloses a single preheating of riser air ignition heat preservation stove relates to and smelts technical field. The utility model discloses an ignition region and heat preservation district, the ignition region includes a plurality of ignition furnace nozzles that link to each other with gas pipe and hot air pipe, the heat preservation district includes the air preheater, be provided with the heat exchanger in the air preheater, the heat exchanger is including the bellows that is located the cold air entrance of heat exchanger, the cold air entry of heat exchanger links to each other with the cold air pipe, the hot air export of heat exchanger links to each other with the hot air pipe, be provided with the heat exchange tube of a plurality of vertical settings in this heat exchanger, this heat exchange tube includes inner tube and outer tube, just be provided with the first punchhole of many rings along its axial equidistant on the side of inner tube, the first punchhole staggered arrangement of adjacent two rings, in the during operation, waste gas in the air preheater is in the. The utility model discloses a predominant use can be under the prerequisite that does not influence the velocity of flow effectively increase heat exchange efficiency to satisfy the sintering process requirement.

Description

Vertical pipe air single-preheating ignition heat preservation furnace

Technical Field

The utility model relates to a smelt technical field, more specifically say, relate to a riser air singly preheats ignition heat preservation stove.

Background

Sintering is an important component of the ore preparation process in the metallurgical industry, particularly in steel smelting, and is also one of the key operations that affect the energy consumption index of the whole smelting process. At present, most of ignition furnaces of sintering plants adopt blast furnace gas as fuel, and because the heat value of the blast furnace gas is too low, the ignition temperature required by a sintering process can be met only by preheating the gas or air, a low-heat-value gas ignition furnace is built, and a preheating furnace is required to be built for preheating the gas or air, and if a double-preheating form is adopted, the structure is complex, the cost is high, the condition of heat exchange damage is easy to occur when the blast furnace gas is preheated, and a large potential safety hazard exists, so that the technical problem is solved by adopting the preheating furnace to preheat the air independently, but the problem is that the preheating furnace cannot produce independently when the preheating furnace fails, equipment can only be stopped to be overhauled, meanwhile, the number of burners of the preheating furnace is unreasonable, high-temperature flue gas and dust generated by combustion are discharged arbitrarily, the manufacturing cost is increased, and energy consumption waste. In addition, the heat exchanger used in the prior art has low heat exchange efficiency, and the heat exchange tubes in the heat exchanger are horizontally arranged, so that the quantity of the heat exchange tubes is small, the quantity of preheated air is small, the use of an ignition furnace cannot be met, and meanwhile, the quantity of the heat exchange tubes is small, so that the heat exchange area is small, and the heat waste is caused.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

An object of the utility model is to overcome prior art's defect, a riser air is single preheats ignition heat preservation stove is provided, adopt the technical scheme of the utility model, can effectively increase heat exchange efficiency under the prerequisite that does not influence the velocity of flow, thereby satisfy the sintering process requirement, reduce the contribution rate of sintering ignition stove to the atmosphere pollution, simultaneously, can solve among the prior art because of receiving the restriction of the horizontal setting of heat exchange tube and lead to the heat exchange tube in the heat exchanger small in quantity, make the preheating air volume few, can't satisfy the use of ignition stove, and the heat exchange tube is small in quantity, lead to heat transfer area few, cause the extravagant scheduling problem of heat.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a single preheating ignition heat preservation stove of riser air, including the platform truck, along the advancing direction of platform truck has set gradually ignition region and heat preservation district, ignition region and heat preservation district all lie in the top of platform truck, wherein, the ignition region includes a plurality of ignition furnace nozzles, the ignition furnace nozzle links to each other with gas pipe and hot air pipe, the heat preservation district includes the air preheating stove, be provided with the heat exchanger in the air preheating stove, the heat exchanger includes the bellows that is located the cold air entrance of heat exchanger, and the cold air entrance of this heat exchanger links to each other with the cold air pipe, the hot air export of heat exchanger links to each other with the hot air pipe, is provided with a plurality of heat exchange tubes that set up in parallel in this heat exchanger, the heat exchange tube is vertical setting, and this heat exchange tube includes inner tube and the outer tube of cover locating the outer tube, the inner tube communicates with the cold, the annular opening between the inner pipe and the outer pipe is communicated with a hot air outlet of the heat exchanger, a plurality of circles of first holes are arranged on the side surface of the inner pipe at equal intervals along the axial direction, each circle of first holes are arranged along the circumferential direction, the first holes of two adjacent circles are arranged in a staggered mode, and during work, waste gas generated in the air preheating furnace is pumped into an air pumping box below the trolley through a charge level on the trolley.

Furthermore, the number of the first holes in each circle is two, the central connecting line of the two first holes is intersected with the central axis of the inner tube, and the central connecting lines of the two first holes in two adjacent circles are vertical to each other.

Further, the central axis of the first hole intersects the central axis of the inner tube.

Furthermore, the central axis of the first hole and the central connecting line of the two first holes on the circumference where the central axis is located form a certain included angle.

Further, the included angle is 30-60 degrees.

Furthermore, a certain distance is reserved between the bottom of the inner pipe and the bottom of the outer pipe, a plurality of second holes are formed in the bottom of the inner pipe, and the distance from the center of each second hole to the center of the end face of the bottom of the inner pipe is equal.

Furthermore, four second holes are formed in the end face of the bottom of the inner pipe, and the distances between the adjacent second holes are equal.

Further, the air preheating furnace comprises a preheating furnace burner, and the preheating furnace burner is connected with a gas pipe and a cold air pipe.

Furthermore, the ignition furnace burner is connected with a cold air pipe through a bypass pipe, and valves are arranged in the bypass pipe and at a cold air inlet of the heat exchanger.

Furthermore, the bottom of the outer pipe is provided with a pouring material.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) the utility model discloses a riser air is single preheats ignition heat preservation stove through the multiplicable gas resistance of setting up of first punchhole, prolongs gaseous dwell time in the heat transfer pipe to increase and preheat the effect, and through first punchhole staggered arrangement, can avoid gaseous mutual interference, reduce the gas resistance in the intangible, guarantee that the velocity of flow satisfies the user demand.

(2) The utility model discloses a riser air singly preheats ignition heat preservation stove, the vertical setting of its heat exchange tube, can solve among the prior art because of the restriction that receives the horizontal setting of heat exchange tube leads to the heat exchange tube in the heat exchanger small in quantity, make the preheating air volume few, can't satisfy the use of ignition stove, and heat exchange tube small in quantity, lead to heat transfer area few, cause the extravagant scheduling problem of heat, and simultaneously, through the vertical setting of heat exchange tube, both can prevent the smoke and dust deposit on the heat exchange tube outer wall, can solve again and lead to the heat exchange tube to be heated unable free expansion because of the horizontal setting of heat exchange tube, and receive the yielding scheduling problem behind the gravity, thereby improve the life.

(3) The utility model discloses a single preheating of riser air ignition heat preservation stove, its ignition stove nozzle still link to each other with the cold air pipe through the bypass pipe, in the bypass pipe to and the cold air entrance of heat exchanger all is provided with the valve. It should be noted that: the utility model discloses a setting of bypass pipe for but the air preheater ignition heat preservation stove independent production when breaking down, the solution is because of the shutdown maintenance that the trouble of air preheater leads to, thereby has reduced the negative effects because of overhauing and bringing.

(4) The utility model discloses a single preheating of riser air ignition heat preservation stove, through the quantity and the position design of every circle first punchhole and the design of the first punchhole position relation on the adjacent two circles, can the gaseous dwell time in the heat exchange tube of at utmost extension, can avoid the mutual interference between the gas again to the at utmost, simultaneously, through seting up the second punchhole in the bottom of inner tube, can further increase heat exchange efficiency.

(5) The utility model discloses a single preheating of riser air ignition heat preservation stove, its structural design is reasonable, and the principle is simple, convenient to popularize and use.

Drawings

FIG. 1 is a schematic structural view of a single preheating ignition holding furnace with stand pipe and air;

FIG. 2 is a schematic structural view of a heat exchange tube of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

FIG. 4 is a schematic structural view of the inner tube of the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 4;

FIG. 6 is a cross-sectional view taken along line a-a of FIG. 5;

fig. 7 is a bottom view of the inner tube of the present invention.

The reference numerals in the schematic drawings illustrate:

1. an ignition furnace burner; 2. a gas pipe; 3. a hot air pipe; 4. a cold air pipe; 5. a preheating furnace burner; 6. an air preheating furnace; 7. a heat exchange pipe; 8. material level;

71. an outer tube; 711. pouring a material; 72. an inner tube; 721. a first eyelet; 722. a second eyelet.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

Example 1

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, the single-preheating ignition heat preservation furnace of the embodiment includes a trolley, an ignition region and a heat preservation region are sequentially arranged along the advancing direction of the trolley, the ignition region and the heat preservation region are both located above the trolley, wherein the ignition region includes a plurality of ignition furnace burners 1, the ignition furnace burners 1 are connected with a gas pipe 2 and a hot air pipe 3, the heat preservation region includes an air preheating furnace 6, a heat exchanger is arranged in the air preheating furnace 6, the heat exchanger includes an air box located at a cold air inlet of the heat exchanger, a cold air inlet of the heat exchanger is connected with the cold air pipe 4, a hot air outlet of the heat exchanger is connected with the hot air pipe 3, a plurality of heat exchange pipes 7 arranged in parallel are arranged in the heat exchanger, the heat exchange pipes 7 are arranged vertically, the heat exchange pipes 7 include an inner pipe 72 and an outer pipe 71 sleeved outside the inner pipe 72, the inner pipe 72 is coaxially arranged with the outer pipe 71, the inner pipe 72 is communicated with a cold air inlet of the heat exchanger, an annular opening between the inner pipe 72 and the outer pipe 71 is communicated with a hot air outlet of the heat exchanger, a plurality of circles of first holes 721 are arranged on the side surface of the inner pipe 72 and at equal intervals along the axial direction of the inner pipe, each circle of first holes 721 are arranged along the circumferential direction, the first holes 721 of two adjacent circles are arranged in a staggered mode, and the pouring material 711 is arranged at the bottom of the outer pipe 71 so as to prolong the service life of the heat exchanger. When the air preheating furnace works, the waste gas generated in the air preheating furnace 6 is pumped into the air pumping box below the trolley through the charge level 8 on the trolley. Specifically, in this embodiment: the cross-sectional area of the annular opening between the inner pipe 72 and the outer pipe 71 is equal to the cross-sectional area of the inner pipe 72, and the diameter of the first hole 721 is equal to the diameter of the inner pipe 72.

It should be noted that: the utility model discloses in the multiplicable gas resistance of setting up of first punchhole 721, prolong the dwell time of gas in heat exchange tube 7 to the increase preheats the effect, and the utility model discloses in first punchhole 721 staggered arrangement, can avoid gaseous mutual interference, reduce the gas resistance in the intangible, guarantee that the velocity of flow satisfies the user demand. Additionally, the utility model discloses the vertical setting of well heat exchange tube 7, can solve among the prior art because of the restriction that receives the horizontal setting of heat exchange tube 7 leads to the heat exchange tube in the heat exchanger small in quantity, make the volume of preheating air few, can't satisfy the use of ignition stove, and heat exchange tube small in quantity, lead to heat transfer area few, cause the extravagant scheduling problem of heat, and simultaneously, through the vertical setting of heat exchange tube 7, both can prevent the smoke and dust deposit on heat exchange tube 7 outer wall, can solve again and lead to the heat exchange tube 7 to be heated because of the horizontal setting of heat exchange tube 7 unable free expansion, and receive yielding scheduling problem behind the gravity, thereby improve heat exchange tube 7. It needs to be further explained that: the utility model discloses well a plurality of parallel arrangement's heat exchange tube 7 constitutes a set of heat transfer subassembly, preheats the effect for further increase, specifically in this embodiment, still can establish ties another group heat transfer subassembly behind a set of heat transfer subassembly and increase a heat transfer return stroke to set up another bellows in the hot-air outlet department of heat exchanger. What needs to be added here is: after the other group of heat exchange assemblies are connected in series, a cold air inlet of the heat exchanger is communicated with the inner pipe 72 of the heat exchange pipe 7 in one group of heat exchange assemblies, and a hot air outlet of the heat exchanger is communicated with an annular opening between the inner pipe 72 and the outer pipe 71 of the heat exchange pipe 7 in the other group of heat exchange assemblies. The specific heat exchange process is as follows: the cold air is guided into one group of heat exchange assemblies for heat exchange under the shunting and flow guiding effects of the air box at the cold air inlet, then enters the other group of heat exchange assemblies for heat exchange, and is guided to the ignition furnace burner 1 through the hot air pipe 3 under the folding and outputting effects of the air box at the hot air outlet. It should be further noted that: the utility model discloses well suction box and heat exchanger correspond the setting from top to bottom, and suction box is located the below of platform truck, and the heat exchanger is located the top of platform truck for suction box can make waste gas through charge level 8 when taking out waste gas, has played a fine heat preservation to charge level 8, has prolonged the heat preservation district in other words, simultaneously, realizes production cleaning and makes the greenization.

The ignition furnace burner 1 is also connected with a cold air pipe 4 through a bypass pipe, and valves are arranged in the bypass pipe and at a cold air inlet of the heat exchanger. It should be noted that: the utility model discloses a setting of bypass pipe for but air preheater 6 ignition heat preservation stove independent production when breaking down, the solution is because of the shutdown maintenance that the trouble of air preheater 6 leads to, thereby has reduced the negative effects because of overhauing and bringing. The specific process is as follows: when the air preheating furnace 6 fails, the valve at the cold air inlet of the heat exchanger is closed, and the valve in the bypass pipe is opened, so that the air preheating furnace 6 can be completely separated.

As shown in fig. 5 and 6, there are two first holes 721 in each circle, and a central line of the two first holes 721 intersects with the central axis of the inner tube 72, and central lines of the two first holes 721 in two adjacent circles are perpendicular to each other. Specifically, in this embodiment: the central axis of the first aperture 721 intersects the central axis of the inner tube 72. Here, it should be explained that: the number of the first holes 721 in each circle is two, and a central connecting line of the two first holes 721 intersects with the central axis of the inner tube 72, that is, the two first holes 721 are arranged oppositely, which needs to be described as follows: the utility model discloses a quantity and the position design of every circle first punchhole 721 and the design of the first punchhole 721 position relation on two adjacent circles can the gaseous dwell time in the heat exchange tube of at utmost extension, can avoid the mutual interference between the gas again to the at utmost.

As shown in fig. 2, 3 and 7, a certain distance is reserved between the bottom of the inner tube 72 and the bottom of the outer tube 71, and a plurality of second holes 722 are formed in the bottom of the inner tube 72, and the distance from the center of each second hole 722 to the center of the end face of the bottom of the inner tube 72 is equal. Specifically, in this embodiment: the bottom end surface of the inner tube 72 is provided with four second holes 722, and the distances between the adjacent second holes 722 are equal. It should be noted that: the utility model discloses a set up second punchhole 722 in the bottom of inner tube 72, can further increase heat exchange efficiency.

A plurality of protrusions are arranged on the outer wall of the outer pipe 71 at equal intervals along the axial direction of the outer pipe, and the cross section of each protrusion is triangular or trapezoidal. It should be noted that: the utility model discloses well this design both can effectively increase the heat transfer area of heat exchange tube 7, improves heat exchange efficiency, has made things convenient for manufacturing again.

As shown in fig. 1, a fire wall is provided right in front of the burner 5 of the preheating furnace, an opening is provided between the fire wall and the top wall of the air preheating furnace 6, and the heat exchange tube 7 is provided on the other side of the fire wall. Specifically, in this embodiment: the air preheating furnace 6 comprises a preheating furnace burner 5, the preheating furnace burner 5 is connected with the gas pipe 2 and the cold air pipe 4, and what needs to be explained is that: the surface temperature of the material surface 8 after ignition is about 400-600 ℃, and the applicant finds that the number of the burners 5 of the preheating furnace can meet the production requirement only by one in consideration of the heat radiation brought by the material surface 8 through long-term production practice, avoids energy consumption waste, and can preheat the heat exchanger inside the air preheating furnace 6 only by utilizing the radiant heat of the material surface 8 without using a combustion system of the air preheating furnace 6 when the sintering working condition is required to be low, thereby well utilizing the heat and reducing the production cost.

Example 2

The embodiment is the same as embodiment 1, except that the central axis of the first hole 721 forms a certain angle with the central line of the two first holes 721 on the circumference, and the angle is 30-60 °. It should be noted that: the utility model discloses a first punchhole 721 horizontal slope sets up, and horizontal inclination can make the air current rotatory along outer tube 71 pipe wall at a high speed for this design of 30~60, effectively increases and preheats the effect.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A riser air single preheating ignition heat preservation stove which is characterized in that: including the platform truck, follow the direction of advance of platform truck has set gradually ignition zone and heat preservation district, ignition zone and heat preservation district all are located the top of platform truck, wherein, the ignition zone includes a plurality of ignition furnace nozzles (1), ignition furnace nozzle (1) links to each other with gas pipe (2) and hot air pipe (3), the heat preservation district includes air preheater (6), be provided with the heat exchanger in air preheater (6), the heat exchanger includes the bellows that is located the cold air entrance of heat exchanger, and the cold air entrance of this heat exchanger links to each other with cold air pipe (4), the hot air export of heat exchanger links to each other with hot air pipe (3), is provided with a plurality of parallel arrangement's heat exchange tube (7) in this heat exchanger, heat exchange tube (7) vertical setting, this heat exchange tube (7) include inner tube (72) and cover outer tube (71) outside inner tube (72), the inner pipe (72) is communicated with a cold air inlet of the heat exchanger, an annular opening between the inner pipe (72) and the outer pipe (71) is communicated with a hot air outlet of the heat exchanger, a plurality of circles of first holes (721) are arranged on the side surface of the inner pipe (72) at equal intervals along the axial direction of the inner pipe, each circle of first holes (721) are arranged along the circumferential direction, the first holes (721) of two adjacent circles are arranged in a staggered mode, and during work, waste gas generated in the air preheating furnace (6) is pumped into an air pumping box below the trolley through a charge level (8) on the trolley.

2. The riser air single preheat ignition holding furnace of claim 1, wherein: the number of the first holes (721) in each circle is two, the central connecting line of the two first holes (721) is intersected with the central axis of the inner pipe (72), and the central connecting lines of the two first holes (721) in two adjacent circles are vertical.

3. The riser air single preheat ignition holding furnace of claim 2, wherein: the central axis of the first hole (721) is intersected with the central axis of the inner pipe (72).

4. The riser air single preheat ignition holding furnace of claim 2, wherein: the central axis of the first eyelet (721) forms a certain included angle with the central connecting line of the two first eyelets (721) on the circumference where the central axis is located.

5. The riser air single preheat ignition holding furnace of claim 4, wherein: the included angle is 30-60 degrees.

6. The riser air single preheat ignition holding furnace of claim 1, wherein: a certain distance is reserved between the bottom of the inner pipe (72) and the bottom of the outer pipe (71), a plurality of second holes (722) are formed in the bottom of the inner pipe (72), and the distance from the center of each second hole (722) to the center of the end face of the bottom of the inner pipe (72) is equal.

7. The riser air single preheat ignition holding furnace of claim 6, wherein: four second holes (722) are formed in the bottom end face of the inner pipe (72), and the distances between the adjacent second holes (722) are equal.

8. The riser air single preheat ignition holding furnace of claim 1, wherein: the air preheating furnace (6) comprises a preheating furnace burner (5), and the preheating furnace burner (5) is connected with the gas pipe (2) and the cold air pipe (4).

9. The riser air single preheat ignition holding furnace of claim 1, wherein: the ignition furnace burner (1) is further connected with a cold air pipe (4) through a bypass pipe, and valves are arranged in the bypass pipe and at a cold air inlet of the heat exchanger.

10. The riser air single preheat ignition holding furnace of claim 1, wherein: the bottom of the outer pipe (71) is provided with a casting material (711).