CN210004760U

CN210004760U - secondary heating structure for horizontal smelting furnace and horizontal smelting furnace

Info

Publication number: CN210004760U
Application number: CN201920845593.XU
Authority: CN
Inventors: 巩万隆; 巩耀武; 袁茂荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-01-31
Anticipated expiration: 2029-06-06

Abstract

The utility model discloses a secondary heating structure for horizontal smelting furnace and contain horizontal smelting furnace of this secondary heating structure, this structure is including establishing at the end package and the furnace body combustion zone of furnace body lower part, the end package is including inner bag, outer courage, heat preservation and shell from inside to outside, and the iron liquid passageway link up to the shell from the inner bag, is melting the chamber in the inner bag, and its upper portion opening communicates with the bottom opening of combustion zone, is the circulation seal between inner bag and the outer courage, and two fire inlet holes have been seted up on circulation layer top, the combustion zone top is provided with two burner holes, burner hole and the concentric fire inlet hole of circulation layer, the nozzle is installed on the burner hole.

Description

secondary heating structure for horizontal smelting furnace and horizontal smelting furnace

Technical Field

The utility model relates to a smelt technical field, concretely relates to secondary heating structures and horizontal smelting furnace for horizontal smelting furnace.

Background

Smelting furnaces are important equipment for melting cast iron in casting production, and are used for melting cast iron blocks into molten iron. The traditional smelting furnace uses coke as fuel, in the furnace, the cast iron block is directly contacted with the coke, and the blast is used for supporting combustion from a tuyere, so that the cast iron is continuously melted. However, the use of coke can cause adverse effects on the environment, so that the purposes of low carbon, energy saving and environmental protection cannot be achieved, and the method does not accord with the social development direction. Therefore, at present, many manufacturers adopt other smelting methods to replace the traditional smelting furnace, for example, a gas smelting furnace adopts gas fuel or liquid fuel, and the smelting furnace has the advantages of cleanness and environmental protection.

The temperature of the molten iron produced by the existing gas smelting furnace is lower, and some molten iron can be raised to above 1400 ℃, but can only be maintained for periods, and the temperature of the molten iron can be lowered to below 1400 ℃ after the furnace is opened for a long time.

SUMMERY OF THE UTILITY MODEL

In order to effectively improve the tapping temperature and improve the problem that the molten iron temperature of the molten iron channel and the tapping hole is low, the utility model provides an kinds of secondary heating structures and horizontal smelting furnace for horizontal smelting furnace adopt the end package structure that has the circulation layer can be effectual heats the molten iron in the end package, promote the molten iron temperature.

The utility model discloses specific technical scheme as follows:

A secondary heating structure for horizontal smelting furnace, which comprises a furnace body combustion section and a bottom bag fixed with the furnace body combustion section from the lower part;

the bottom bag comprises an inner container, an outer container, a heat insulation layer and a shell from inside to outside, and the molten iron channel is communicated from the inner container to the shell; the inner container is internally provided with a melting cavity, and an upper opening of the melting cavity is communicated with a bottom opening of the combustion section; a circulation layer with a closed top end is arranged between the inner container and the outer container; two fire inlet holes are formed in the top end of the circulating layer and are respectively communicated with the bottom of the combustion section;

the top end of the combustion section is provided with two burner holes which are respectively concentric with the two fire inlet holes of the circulating layer.

The scheme of step is that the two burner holes are respectively a long flame burner hole and a flat flame burner hole, and are respectively used for installing a long flame burner and a flat flame burner.

, the scheme is that the combustion section comprises a gradually expanding section, an equal diameter section and a gradually reducing section, the section of a hearth of the gradually expanding section is gradually increased from left to right, the section of the hearth of the equal diameter section is the same as and correspondingly communicated with the section of the tail end of the hearth of the gradually expanding section, the section of the hearth of the gradually reducing section is gradually reduced from left to right, the end with the larger section is communicated with the hearth of the equal diameter section, and the end with the smaller section is closed.

, the two burner holes are arranged on both sides of the top end of the equal-diameter section.

horizontal smelting furnace, comprising a secondary heating structure in any of the above schemes.

Compared with the prior art, the utility model has the advantages as follows:

1) the utility model adopts the bottom ladle structure with the circulating layer to effectively heat the molten iron in the bottom ladle and improve the temperature of the molten iron; wherein the temperature in the melting chamber can reach 1470-; the smelting speed is high, and molten iron can be obtained after charging materials are thrown for 5-10 minutes.

2) The utility model discloses burning zone furnace's kettle formula structure has realized even furnace temperature with setting up of the mode of two nozzles burning in turn, and the difference in temperature is less than 5 degrees centigrade.

Drawings

FIG. 1 is a schematic view of the overall structure of a natural gas smelting furnace of the present invention;

FIG. 2 is a perspective view of the natural gas smelting furnace of the present invention;

FIG. 3 is a schematic view of the furnace body of the natural gas smelting furnace of the present invention;

FIG. 4 is a sectional view of the bottom ladle of the natural gas smelting furnace of the present invention;

FIG. 5 is a top view of the bottom ladle of the natural gas smelting furnace of the present invention;

FIG. 6 is a front view of the pot structure of the furnace body of the natural gas smelting furnace of the present invention;

fig. 7 is a top view of the pot structure of the furnace body of the natural gas smelting furnace.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

As shown in figures 1 and 2, the embodiment discloses horizontal smelting furnaces, which comprise a feeding system 1, a dust removal system 2, a combustion system 3, a control system, a furnace body 5 and a bottom ladle 6, wherein the feeding system 1 comprises a feeding rail 1-1, a feeding hopper 1-2, a winch and a steel wire rope, the lower end of the feeding rail 1-1 is fixed in a pit, the upper end of the feeding rail 1-1 is fixed at the upper end of a feed port 5-1 of the furnace body 5, the feeding hopper 1-2 can reciprocate on the feeding rail 1-1, the steel wire rope is driven by the winch to realize the up-and-down reciprocating motion of the feeding hopper 1-2, the dust removal system 2 comprises a cyclone separator 2-1, a bag-type dust collector 2-2 and a draught fan, waste flue gas enters the cyclone separator 2-1 through a pipeline to filter part of dust, enters the bag-type dust collector 2-2 through the pipeline to be filtered, and then is discharged into air through the draught fan, the combustion system 3 comprises a burner 3-1, an air pipeline 3-2, an air pipeline 3-3, an air pipeline 3, a natural gas pipeline 3-3, a regulating valve, a natural gas flow meter, a control system, a power supply pipeline, a heat exchanger, a heater, a.

In the scheme provided by the utility model:

as shown in figure 6, a hearth of an overheating section 5-3 is funnel-shaped and is vertically placed and can store materials, a end with a large section of the hearth of the overheating section is communicated with a heating section 5-2, a end with a small section of the hearth of the overheating section is transversely communicated with a hearth of a combustion section 5-4, the combustion section 5-4 is divided into A, B, C sections, a combustion section A is a gradually expanding section, the section of the hearth is gradually increased from left to right, a combustion section B is an equal-diameter section, the section of the hearth is the same as and correspondingly communicated with the section of the tail end of the hearth of the combustion section A, a combustion section C is a gradually reducing section, the section of the hearth is gradually reduced from left to right, the end with a large section is communicated with the hearth of the combustion section B, the end with a small section is closed, and a A, B, C section of the combustion section 5-4 is formed in a body, and forms a non-edge pot-shaped structure inside the pot-shaped structure, wherein smooth transition and uniform heating of the non-edge-shaped.

As shown in figures 4 and 5, the bottom bag 6 comprises an inner container 6-1, an outer container 6-2, a heat insulation layer 6-3 and a shell 6-4 from inside to outside, and an iron liquid channel is communicated from the inner container 6-1 to the shell 6-4. The inner container 6-1 is internally provided with a melting cavity 6-1-1, and the upper opening of the inner container is communicated with the bottom opening of the combustion section B. A closed circulating layer 6-2-1 is arranged between the inner container 6-1 and the outer container 6-2, the top end of the circulating layer 6-2-1 is provided with a fire inlet A6-2-2 and a fire inlet B6-2-3, and the flame of the burner enters the circulating layer 6-2-1 through the fire inlet to heat the iron liquid in the melting cavity 6-1-1. The bottom ladle structure with the circulating layer 6-2-1 is adopted, so that the molten iron in the bottom ladle 6 can be effectively heated, and the temperature of the molten iron is increased. For example, in a smelting furnace adopting burners of the same type without using a circulating layer, the materials are put in for 30 minutes, and then the iron liquid is put at the temperature of 1350-; after a circulating layer bottom ladle structure is adopted, the iron liquid is discharged after the materials are put in for 30 minutes, and the temperature of the iron liquid can reach 1470-; the temperature of the iron liquid of the smelting furnace without using the circulating layer is higher before the iron liquid enters the inner container, and the iron liquid flowing into the inner container can be gradually cooled along with the time; the tap hole and the molten iron channel are easy to be cooled and blocked; by adopting the circulation layer bottom package structure, the temperature of the molten iron channel can be improved by heating the molten iron channel through the circulation layer, so that the condition is avoided. Can find out through the contrast that the end package that adopts circulation layer structure can effectual promotion tapping temperature to improve the problem that molten iron passageway and tap hole molten iron temperature are low.

As shown in FIGS. 5-7, flat flame burner holes 3-6-2 and long flame burner holes 3-6-1 are arranged at both sides of the top end of the combustion section B of the furnace body; the flat flame burner hole 3-6-2 is concentric with the fire inlet hole A6-2-2; the long flame burner hole is concentric with the fire inlet hole B6-2-3; the bottom of the combustion section is provided with a channel which is concentric with the two burner holes and is communicated with the two fire inlet holes; so that the flame in the burner can enter the circulating layer 6-2 of the bottom bag through the combustion section to secondarily heat the liner of the bottom bag 6.

The combustion system 3 comprises two burners, namely a long flame burner 3-5-1 and a flat flame burner 3-5-2 in the embodiment, and the same burners can be selected in other embodiments; the flat flame burner 3-5-2 is positioned on the flat flame burner hole 3-6-2 at the top of the combustion section of the furnace body, the long flame burner 3-5-1 is positioned on the long flame burner hole 3-6-1 at the top of the combustion section 5-4 of the furnace body, and the two burners alternately work through the switching of the four-way valve 3-7.

The method comprises the steps of enabling a flat flame burner 3-5-2 and a long flame burner 3-5-1 to work alternately, enabling the alternate time to be 30-120 seconds according to different practical conditions, enabling the flat flame burner to enlarge the combustion flame surface when the flat flame burner works, enabling 70% -80% of flame to be sprayed into a hearth of a pot-type structure of a combustion section 5-4, enabling the flame to be uniformly dispersed into the whole hearth through a smooth fillet inside the pot-type structure, enabling to enable materials to be heated in all directions to promote melting of the materials, enabling the refractory materials in a furnace to obtain uniform heat to enable the expansion coefficient of the refractory materials at each corner to be uniform, reducing the generation of cracks of the refractory materials when the refractory materials are used, prolonging the service life of a smelting furnace, enabling 20% -30% of flame to enter a circulation chamber 6-2-1 through a flame inlet hole A6-2-2, enabling the flame entering the circulation chamber 6-1 to heat the inner container 6-1, enabling the flame to fully circulate through the flame inlet hole B6-2-3, enabling the flame to be discharged from the flame inlet hole B6-2-3, enabling the flame to enter the circulation chamber 2-1, enabling the flame to be fully circulated after the flame entering the circulation layer 6-1, enabling the flame to enter the flame inlet hole B6-2-2, enabling the flame to be fully circulated in the flame to be sprayed into the hearth, enabling the flame in the flame inlet of the circulation chamber, enabling the flame to be sprayed into the flame to be fully, enabling the flame to be sprayed into the flame burner 2-6-2, enabling the flame to be sprayed into the flame to be fully.

As shown in FIG. 7, WRR-430 thermocouple thermometer 5-4-2 and thermometer 5-4-3 are arranged on both sides of combustion section 5-4; through experiments, when the flat flame burner works at full load, the counting temperature difference of the two thermometers is less than 40 ℃, and the temperature difference is less than 2%; when the long flame burner works at full load, the counting temperature difference of the two thermometers is less than 30 ℃, and the temperature difference is less than 1.5%. The data show that the pot-type structure of the combustion section 5-4 hearth and the arrangement of the alternate combustion mode of the two burners realize uniform hearth temperature, and the temperature difference is less than 5 ℃.

The specific embodiments are only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications to the embodiments as required after reading the present specification, but all the embodiments are protected by the patent laws within the scope of the claims of the present invention.

Claims

1, A secondary heating structure for horizontal smelting furnace, which is characterized in that the secondary heating structure comprises a furnace body combustion section and a bottom bag fixed with the furnace body combustion section from the lower part;

2. The secondary heating structure of claim 1, wherein the two burner holes are respectively a long flame burner hole and a flat flame burner hole for installing a long flame burner and a flat flame burner.

3. The secondary heating structure of claim 1, wherein the combustion section comprises a gradually expanding section, an equal diameter section and a gradually reducing section, the hearth section of the gradually expanding section is gradually increased from left to right, the hearth section of the equal diameter section is the same as and correspondingly communicated with the hearth end section of the gradually expanding section, the hearth section of the gradually reducing section is gradually reduced from left to right, the end with the larger section is communicated with the hearth of the equal diameter section, and the end with the smaller section is closed.

4. The secondary heating structure as set forth in claim 3, wherein the two burner holes are provided on both sides of the tip end of the constant diameter section.

A horizontal smelting furnace of kind, which is characterized by comprising a secondary heating structure of any of claims 1-4.