CN207610534U - Rotary hearth furnace - Google Patents

Abstract

The utility model discloses a kind of rotary hearth furnaces, the rotary hearth furnace includes furnace body, siege and the charging portion of annular, furnace chamber is limited in the furnace body, the feed zone to communicate with each other, preheating zone, reducing zone and discharge zone are limited in the furnace chamber, there is the feed zone feed inlet, the discharge zone to have discharge port.The siege is located in the furnace chamber, and the siege is for carrying material followed by the feed zone, the preheating zone, the reducing zone and the discharge zone.The charging portion into the discharge zone for being added antioxidant.According to the rotary hearth furnace of the utility model embodiment, the charging portion of antioxidant is added to discharge zone due to being equipped in furnace chamber, it can efficiently and safely prevent high-temperature metal pellet re-oxidation during discharging.

Description

Rotary hearth furnace

Technical field

The utility model is related to chemical industry and field of metallurgical equipment more particularly to a kind of rotary hearth furnaces.

Background technology

In recent years, mainly there are three aspects for the development of metallized pellet：First, non coke iron making resource requirement；Second, it seeks Seek the substitute of scrap resources；Third, direct reduced iron production technology.In direct reduced iron production process, especially uses and turn In the stove Direct Reduction Technology of bottom, reaction temperature is 1200 DEG C -1400 DEG C, and the metallized pellet dump temperature that reduction roasting obtains is more It it is 800 DEG C -1100 DEG C, and degree of metalization is high, metallic iron activity is high.But in the environment of high temperature, metallized pellet holds very much It easily reoxidizes and is bonded mutually, this can not only influence the normal work of discharging equipment, influence the steady production run of rotary hearth furnace, also Qualified metallized pellet cannot be obtained, subsequent smelting process is influenced.Currently, how to prevent metallized pellet during discharging Be a major issue in oxidation.That is, at present, it would be highly desirable to which developing one kind can effectively prevent metal pelletizing to reoxidize simultaneously The new technology and new equipment of high efficiente callback ferronickel.

Utility model content

The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model carries Go out a kind of rotary hearth furnace, the rotary hearth furnace can effectively and safely prevent reduced iron from showing for re-oxidation occur in discharging As,

According to the rotary hearth furnace of the utility model embodiment, including：The furnace body of annular limits furnace chamber in the furnace body, institute It states and limits the feed zone to communicate with each other, preheating zone, reducing zone and discharge zone in furnace chamber, the feed zone has feed inlet, institute Stating discharge zone has discharge port；Siege, the siege are located in the furnace chamber, and the siege passes through institute successively for carrying material State feed zone, the preheating zone, the reducing zone and the discharge zone；And for antioxidant to be added to the discharge zone Charging portion.

According to the rotary hearth furnace of the utility model embodiment, the charging of antioxidant is added to discharge zone due to being equipped in furnace body Therefore portion can efficiently and safely prevent high-temperature metal pellet re-oxidation during discharging.

In some embodiments, the charging portion is filled with cooling gas to the discharge zone.

In some embodiments, the antioxidant that the charging portion is filled with to the discharge zone includes coal dust and lime At least one of stone.

In some embodiments, the antioxidant is covered in the surface of material by the charging portion.

In some optional embodiments, the charging portion is nozzle, and the nozzle is carrier towards institute using inert gas State the mixing antioxidant of siege injection coal dust, lime stone.

In some embodiments, the rotary hearth furnace further includes：Partition wall, the partition wall are located in the furnace body, the partition wall For the discharge zone to be spaced apart at least one of the feed zone and the reducing zone.

Specifically, the partition wall includes：First sub- partition wall, the first sub- partition wall are located in the furnace chamber with described in separation Reducing zone and the discharge zone；Second sub- partition wall, the second sub- partition wall be located in the furnace chamber with separate the feed zone with The discharge zone；Wherein, the described first sub- partition wall and the described second sub- partition wall are respectively by the roof of the furnace body towards the stove Bed extends, and the first sub- partition wall and the second sub- partition wall are formed with space between the siege respectively.

In some embodiments, the discharge zone is the micro-positive pressure area of air pressure 20pa-50pa.

In some embodiments, the discharge zone is 20 ° -40 ° in the central angle of the annular furnace chamber of the entire furnace body.

In some embodiments, the preheating zone and reducing zone are located on the furnace body and are equipped with burner, the furnace body is upper It is equipped with smoke outlet in the preheating zone.

In some embodiments, the grain size of coal dust and lime stone is 150 mesh or less.

The additional aspect and advantage of the utility model will be set forth in part in the description, partly will be from following description In become apparent, or recognized by the practice of the utility model.

Description of the drawings

The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination following accompanying drawings to embodiment Become apparent and is readily appreciated that, wherein：

Fig. 1 is the overall structure vertical view of the rotary hearth furnace of the utility model embodiment.

Fig. 2 is the diagrammatic cross-section of the rotary hearth furnace of the utility model embodiment.

Fig. 3 is the local structural graph of the siege of the rotary hearth furnace of the utility model embodiment.

Reference numeral：

Rotary hearth furnace 1,

Furnace body 10, furnace chamber 110, feed zone 111, preheating zone 112, reducing zone 113, discharge zone 114, smoke outlet 115, siege 20, charging portion 30,

Partition wall 40, the first sub- partition wall 410, the second sub- partition wall 420,

Distributing device 50, drawing mechanism 60, furnace bottom holder 70, water seal 80, burner 90.

Specific implementation mode

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model Limitation.

In the description of the present invention, it should be understood that term "center", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on ... shown in the drawings Or position relationship, be merely for convenience of describing the present invention and simplifying the description, do not indicate or imply the indicated device or Element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as the limit to the utility model System.In addition, defining " first ", the feature of " second " can explicitly or implicitly include one or more this feature. In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.

Below with reference to Fig. 1-Fig. 3 descriptions according to the concrete structure of the rotary hearth furnace 1 of the utility model embodiment.

As Figure 1-Figure 2, include furnace body 10,20 and of siege of annular according to the rotary hearth furnace of the utility model embodiment 1 Charging portion 30.Furnace chamber 110 is limited in furnace body 10, limited in furnace chamber 110 feed zone 111 to communicate with each other, preheating zone 112, There is feed inlet, discharge zone 114 to have discharge port for reducing zone 113 and discharge zone 114, feed zone 111.Siege 20 is located at furnace chamber In 110, siege 20 flows successively through feed zone 111, preheating zone 112, reducing zone 113 and discharge zone 114 for carrying material, feeds Portion 30 is used to that antioxidant to be added to discharge zone 114.

It is understood that charging portion 30 is used to that antioxidant to be added to the material positioned at discharge zone 114, thus, it is possible to Improving the ambiance in discharge zone 114, the metallized pellet and oxygen for avoiding discharging process high temperature react, to Achieve the purpose that prevent high-temperature metal pellet from reoxidizing.In addition, preventing height using antioxidant is added into discharge zone The Scheme Security performance that warm metallized pellet reoxidizes is higher.

According to the rotary hearth furnace 1 of the utility model embodiment, antioxygen is added due to being equipped with to discharge zone 114 in furnace chamber 110 Therefore the charging portion 30 of agent can efficiently and safely prevent high-temperature metal pellet re-oxidation during discharging.

In some embodiments, charging portion 30 is filled with cooling gas to discharge zone 114.It is understood that cooling gas Play the role of cooling down to high-temperature metal pellet, the metallized pellet that temperature reduces is not easy to be bonded mutually so that material can be with Furnace chamber 110 is smoothly discharged.

Specifically, cooling gas is inert gas.The lower inert gas of temperature can not only reduce high temperature metallization ball The temperature of group, can also prevent metallized pellet from aoxidizing to a certain extent.Certainly, the type of cooling gas can also have other Gas, such as carbon monoxide, nitrogen etc..

In some embodiments, charging portion 30 is filled with the mixing antioxidant of coal dust and lime stone to discharge zone 114.It needs Illustrate, lime stone is decomposed at high temperature and coal gasification reaction needs a large amount of heat, reduces metallized pellet Temperature, temperature reduce metallized pellet be not easy to be bonded mutually.In addition, the decomposition product of lime stone is calcium oxide, calcium oxide It is attached on metallized pellet, not only can prevent metallized pellet during transporting and being subsequently packed into other smelting apparatus Reoxidize, when can also continue smelting technology after entering, improve the melting condition of metallized pellet, reduce smelting temperature and Energy consumption.Certainly in the embodiments of the present invention, antioxidant is not limited to lime stone and coal dust, can also be it His industrial antioxidant.

In some embodiments, antioxidant is covered in surface of material by charging portion 30.It is understood that by anti-oxidant Metallized pellet reoxidizes during agent is covered in surface of material not only and can prevent discharging, can also in transport and subsequently During being packed into other smelting apparatus, prevent metallized pellet from reoxidizing.

In some optional embodiments, charging portion 30 is nozzle, and nozzle is sprayed using inert gas as carrier towards siege 20 Penetrate the mixing antioxidant of coal dust, lime stone.It should be noted that the cooling-down effect of metallized pellet is mainly by set about Duan Shixian's：Decomposition of limestone is reacted and the gasification reaction of carbon is the endothermic reaction, and inert gas is sprayed onto metallized pellet energy It is enough that its temperature is down to 1100 DEG C hereinafter, ensureing that metallized pellet steadily discharges, metallized pellet will not be adhered.In addition, When inert gas is sprayed onto metallized pellet, metallized pellet is surrounded by inert gas, while the gasification reaction of carbon will produce The CO gas of part carbon monoxide, generation is also enclosed in around metallized pellet, and discharge zone is integrally filled with as a result, Weak reducing atmosphere so that metallized pellet is in weak reducing atmosphere, to effectively prevent the oxygen again of metallized pellet Change.When lime stone is sprayed onto metallized pellet surface, under the high temperature action of metallized pellet, lime stone, which is decomposed, reacts production Raw calcium oxide, the calcium oxide of generation are coated on the surface of metallized pellet, and the calcium oxide clad generated in this way can not only be prevented Only metallized pellet aoxidizes during discharging, additionally it is possible to metallized pellet be prevented to be packed into the mistake of smelting apparatus in subsequent thermal It is aoxidized in journey, meanwhile, in fusion process, such calcium oxide clad plays the role of slag adjusting agent, without additional Calcareous slag adjusting agent is added, and melting condition can be improved, reduces smelting temperature and energy consumption.

In some embodiments, rotary hearth furnace 1 further includes partition wall 40, and partition wall 40 is located in furnace body 10, and partition wall 40 will be for that will go out Material area 114 is spaced apart at least one of feed zone 111 and reducing zone 113.Thus, it is possible to which so that discharge zone 114 is in phase To closed state, it is therefore prevented that the antioxidant that charging portion 30 is added, which enters feed zone 111 or reducing zone 113, influences above-mentioned two The normal work in area.

Specifically, as shown in Figure 1, partition wall 40 includes the first sub- partition wall 410 and the second sub- partition wall 420.First sub- partition wall 410 It is located in furnace chamber 110 to separate reducing zone 113 and discharge zone 114, the second sub- partition wall 420 is located in furnace chamber 110 to separate charging Area 111 and discharge zone 114.First sub- partition wall 410 is prolonged by the roof of furnace body 10 towards siege 20 respectively with the second sub- partition wall 420 It stretches, and the first sub- partition wall 410 and the second sub- partition wall 420 are formed with space between siege 20 respectively.

It is understood that material enters and leaves discharge zone 114 from space, and charging portion 30 is added it is anti-oxidant by It is acted in the baffle of the first sub- partition wall 410 and the second sub- partition wall 420, reducing zone 113 and discharge zone 114 will not be entered.It protects as a result, It has demonstrate,proved discharge zone 114 and has been in the space being relatively isolated, it is therefore prevented that the antioxidant that charging portion 30 is added enters feed zone 111 and goes back Former area 113 influences the normal work in above-mentioned twoth area.Certainly, partition wall 40 may be formed as other forms, such as the formation of partition wall 40 For cylindrical surface will discharge 114 be wrapped in.It needs additional description, partition wall 40 that can be formed as tabular, can also be formed For other shapes such as arc-shapeds, limitation is not made to the concrete shape of partition wall 40 herein.

In conclusion a purpose of the utility model is to propose a kind of turn for preventing metallized pellet from reoxidizing Bottom stove 1, this method make discharge zone 111 be in relatively independent space, and going out by establishing partition wall 10 in 111 both sides of discharge zone Expect that nozzle is arranged at the top of the furnace body in area 111, as a result, using inert gas as carrier, the mixed material of coal dust and lime stone is carried It is sprayed onto metallized pellet surface, wherein the temperature of inert gas can be room temperature or lower.More optimizedly, the temperature of inert gas Degree is at 0-25 DEG C.

In some embodiments, discharge zone 114 is the micro-positive pressure area of air pressure 20pa-50pa.

In some embodiments, discharge zone 114 is 20 ° -40 ° in the central angle of the annular furnace chamber 110 of entire furnace body 10.It needs If being noted that central angle is smaller, material is too short in 114 remaining time of discharge zone, and the temperature of metallized pellet cannot Rapid decrease, it is larger to the pressure for the spiral that discharges, and it is likely to cause material bonding, it influences to produce direct motion；But if central angle It is larger, then the size of reducing zone 113 can be reduced, the reduction effect of material is influenced.In conclusion discharge zone 114 is in entire furnace body The central angle of 10 annular furnace chamber 110 can be controlled in 20 ° -40 °, can not only ensure the smooth discharge of material in this way, but also can ensure The reduction effect of material.Certainly, discharge zone 114 is not limited to above-mentioned in the central angle of the annular furnace chamber 110 of entire furnace body 10 Range, user can make appropriate adjustment according to actual needs.

In some embodiments, reducing zone 113 is located on furnace body 10 and is equipped with burner 90, is located at preheating zone 112 on furnace body 10 Equipped with smoke outlet 115.Inner flue gas of the stove is discharged from smoke outlet 115 as a result, and fume afterheat recycling can be used for preheating gas combustion air And Secondary Air so that flue gas has obtained secondary use, reduces energy loss.

The concrete structure of the rotary hearth furnace 1 of one specific embodiment of the utility model is described below with reference to Fig. 1-Fig. 3.

As shown in Figure 1-Figure 3, a diameter of 20 meters of the furnace bottom of the rotary hearth furnace 1 of the present embodiment, including the furnace body 10 of annular, siege 20 and charging portion 30.Furnace chamber 110 is limited in furnace body 10, and the feed zone 111 to communicate with each other, preheating zone are limited in furnace chamber 110 112, there is feed inlet, discharge zone 114 to have discharge port, and discharge zone 114 for reducing zone 113 and discharge zone 114, feed zone 111 Central angle be 20 ° -40 °.Siege 20 is located in furnace chamber 110, and siege 20 is for carrying material followed by feed zone 111, pre- Hot-zone 112, reducing zone 113 and discharge zone 114, charging portion 30 on the siege 20 of discharge zone 114 for being added antioxidant.

It is equipped with distributing device 50 at feed inlet as shown in Figure 1, being closed on furnace body 10, closes on discharge outlet and is equipped with drawing mechanism 60.It is additionally provided with burner 90 positioned at reducing zone 113 on furnace body 10, being located at preheating zone 112 on furnace body 10 is equipped with smoke outlet 115.In stove Flue gas from smoke outlet 115 be discharged, fume afterheat recycling by needed for rotary hearth furnace 1 coal gas combustion-supporting wind and Secondary Air preheat, Coal gas combustion-supporting wind and Secondary Air after preheating are connected to the heating device of rotary hearth furnace 1 by pipeline.As shown in Fig. 2, under siege 20 Side is equipped with the furnace bottom holder 70 for being used to support siege 20, and 20 lower section of siege is equipped with the water seal 80 for preventing inner flue gas of the stove from revealing.

When work, material is uniformly arranged on siege 20 by the distributing device 50 of feed zone 111 and forms material by material Layer is rotated by the transmission system drives siege 20 of siege 20, and material and siege 20 are without relative motion, with turning for siege 20 Dynamic, material is in furnace chamber 110 successively by preheating zone 112, reducing zone 113 and discharge zone 114.In discharge zone 114, charging portion 30 are formed as nozzle, and coal dust, limestone mix material are used strong cold inert gas to be sprayed onto surface of material for carrier by nozzle, utilize The gasification reaction heat absorption of strong cold inert gas and decomposition of limestone, carbon can make metallized pellet temperature be down to 1100 DEG C hereinafter, simultaneously And discharge zone 114 is made to be in weakly reducing atmosphere, reoxidizing for metallized pellet can be effectively prevent.The calcium oxide that decomposition of limestone generates It is wrapped in metallized pellet surface, can also be prevented during metallized pellet discharges process and subsequent thermal loading smelting apparatus Metallized pellet reoxidizes, and a certain amount of calcium oxide is added in follow-up fusion process and can adjust slag system, improves melting condition, Reduce smelting temperature and energy consumption.

The rotary hearth furnace 1 of the present embodiment, by establishing the isolation discharge zone 114 of partition wall 40 and charging portion 30 being arranged in furnace body 10, Strong cold inert gas is used to spray into appropriate lime stone and coal dust for carrier, using decomposition of limestone and cloth Dorr endothermic heat of reaction and by force Cold inert gas makes metallized pellet cool down, and ensures that rotary hearth furnace 1 normally discharges, carbon monoxide and lime stone are generated after simultaneous reactions The calcium oxide that decomposition generates, which is attached to metallized pellet table, to effectively prevent metallized pellet to reoxidize, and can improve follow-up melting Condition.The rotary hearth furnace 1 of the present embodiment, which has, prevents metallized pellet from reoxidizing, and improves melting condition, reduces production process energy consumption The advantages that.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term It states and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be It can be combined in any suitable manner in any one or more embodiments or example.

While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that： Can these embodiments be carried out with a variety of variations in the case where not departing from the principles of the present invention and objective, modification, replaced And modification, the scope of the utility model are limited by claim and its equivalent.

Claims (10)

1. a kind of rotary hearth furnace, which is characterized in that including：

The furnace body of annular limits furnace chamber in the furnace body, limited in the furnace chamber feed zone to communicate with each other, preheating zone, There is feed inlet, the discharge zone to have discharge port for reducing zone and discharge zone, the feed zone；

Siege, the siege are located in the furnace chamber, and the siege passes through the feed zone, described pre- successively for carrying material Hot-zone, the reducing zone and the discharge zone；And

Charging portion for antioxidant to be added into the discharge zone.

2. rotary hearth furnace according to claim 1, which is characterized in that the charging portion is configured to be filled with to the discharge zone Cooling gas.

3. rotary hearth furnace according to claim 1, which is characterized in that the charging portion is configured to be filled with to the discharge zone The antioxidant include at least one of coal dust and lime stone.

4. rotary hearth furnace according to claim 1, which is characterized in that the antioxidant is covered in described by the charging portion Surface of material.

5. rotary hearth furnace according to claim 1, which is characterized in that the charging portion is nozzle, and the nozzle is with indifferent gas Body is the mixing antioxidant that carrier sprays coal dust, lime stone towards the siege.

6. rotary hearth furnace according to claim 1, which is characterized in that further include：Partition wall, the partition wall are located at the furnace body Interior, the partition wall is for the discharge zone to be spaced apart at least one of the feed zone and the reducing zone.

7. rotary hearth furnace according to claim 6, which is characterized in that the partition wall includes：

First sub- partition wall, the first sub- partition wall are located in the furnace chamber to separate the reducing zone and the discharge zone；

Second sub- partition wall, the second sub- partition wall are located in the furnace chamber to separate the feed zone and the discharge zone；

Wherein, the described first sub- partition wall is extended by the roof of the furnace body towards the siege respectively with the described second sub- partition wall, And the first sub- partition wall and the second sub- partition wall are formed with space between the siege respectively.

8. rotary hearth furnace according to claim 1, which is characterized in that the discharge zone is the micro-positive pressure of air pressure 20pa-50pa Area.

9. rotary hearth furnace according to claim 1, which is characterized in that annular furnace chamber of the discharge zone in the entire furnace body Central angle be 20 ° -40 °.

10. rotary hearth furnace according to claim 1, which is characterized in that be located at the preheating zone and reducing zone on the furnace body It is located at the preheating zone equipped with burner, on the furnace body and is equipped with smoke outlet.