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标题：0.5T串联中频炉—0.5T串联中频炉价格，0.5T串联中频炉选购方法，0.5T串联中频炉制造商。

关键词：0.5T串联中频炉

描述：0.5T串联中频炉是0.5T中频电炉也是0.5T中频感应电炉,提供快速选择“0.5T串联中频炉”的好方法，提供0.5T串联中频炉价格,0.5T串联中频炉炉体结构选择，选择0.5T串联中频炉的理由功率因数0.96.

 

一、如何快速选择好的0.5T串联中频炉？

 

说明：0.5T功率因数

串联中频炉功率因数高：≥0.96，因为电源的整流部分所有可控硅均处于全开放状态，整流电路一直处于全导通状态，升功率是调串联逆变桥的电压来实现。因此，在整个运行过程中（包括低功率、中功率、大功率）能保证设备一直处在高效率阶段。

并联中频炉功率因数低：≤0.92，因为电源的整流部分所有可控硅处于半开放状态（按国家电网要求需加额外补偿）并联线路调功率是通过调接整流导通角度，因此在低功率时，电力系统功率因素很低，一般在40%-80%；高次谐波很大，严重干扰电网。

二，0.5T串联中频炉的主要用途

0.5T串联中频炉主要应用于熔化钢、铁、铜、铝及合金等，具有熔化效率高，节电效果好，金属成份均匀，烧损少，温升快，温度容易控制等特点，适合各种金属熔化。

三，0.5T串联中频炉组成：

400kw串联中频电源—钢壳炉体—水冷电缆—远程操作台—ZXZ-40T闭环冷却塔。

四，0.5T串联中频炉价格汇总表

0.5T串联中频炉的价格按照中频电源的功率和炉体的容积来计算出来的。不同的配置价格有所不同。此价格只作为参考。联系我们会有很低的价格，具体价格请咨询。15038554363 firsTfurnace@gmail.com   

0.5T串联中频炉分项价格

五、0.5T串联中频炉的电源功率,吨位,电耗的选择方法.

六、0.5T串联中频炉电路图:

七，选择0.5T串联中频炉的理由：

1. 整机可实现傻瓜式操作，避免因操作失误造成事故。

2. 整流逆变合用一个功率电位器完成，缓冲软启动。自判断负载状态，如果负载短路或开路，均可以零冲击、微电流锁控逆变输出，避免故障进一步扩大。

3. 高功率因数，低谐波干扰。整机功率因数comφ≥0.96，无需配置无功补偿和消谐波装置,降低建厂投资.

4. 逆变脉宽和换流死区时间均可灵活调整，以适应各种负载频率。

5. 高启动成功率:任何负荷状态均可100%启动,具有极高的负载适应能力：即便在冻炉（冷炉）状态下仍可高功率因数满负荷输出 。

6. 极高的节电效果：相对并联谐振节电率达20~30%，其原因如下

   ⑴、关断损耗小 由于串联谐振属于自然换流，无换流重叠角，所以不存在关断损耗；

   ⑵、高电压特性 串联谐振属于电压谐振，感应器电压是输出电压的Q倍，无需倍压或变压器升压就可得到 1500V—4000V 高压，逆变输出的每一份电流都流经感应负载，相对并联谐

   振，槽路电流要小2—3倍。这种高电压，低电流特性使得槽路损耗大幅度降低。

   ⑶、低无功损耗 串联谐振属于电压谐振，直流滤波采用电容滤波，正常工作时整流桥处于全开放状态，对电网功率因数达到 cosφ≥0.96以上，再加上低谐波损耗，电效率远高于

   并联谐振。

   u高兼容性：该板预留IGBT驱动接口、温控接口、远程控制接口、联机封锁保护接口。外加IGBT驱动板可以直接驱动IGBT模块；加温控仪（或计算机）可实现可编程温控。

   u环保性能好：相对并联谐振，整机运行声音平稳轻脆，无杂波噪音，对电网中频谐波极小。 八，0.5T串联中频炉炉体结构有哪些选择?

   0.5T串联中频炉炉体由炉壳、感应圈、炉衬、倾炉减速箱等四个部分组成.其中炉体结构的选择有两种:以减速机为倾炉方式的铝合金结构的供应熔化炉俗称铝壳炉。以液压缸为倾炉方式的钢结构的感应熔化炉俗称钢壳炉。钢壳炉是钢结构，铝壳炉外壳材质是铝合金。0.5T串联中频炉因为体积居中,铝壳炉和钢壳炉都有客户选用，国内以钢壳炉居多。

   九，客户在购买0.5T串联中频炉之前需要给供应商提供什么信息？

   1.0.5T串联中频炉要有布置空间，需要提供厂房的面积及布置图

   2.客户需要提供变压器的容量，进线电压的大小、进线电压的频率。

   3.中频感应炉需要水冷设备，0.5T串联中频炉的配置是否含有水冷设备。

   4、中频感应熔化炉的炉体结构有钢壳炉体和铝壳炉体，需要客户指定炉体结构

   5，中频感应熔化炉的供电电源为中频电源，中频电源的线路结构分为逆变并联和逆变串联结构，逆变串联结构为节能型，功率因数为0.98，线路稳定。逆变并联结构为并联型，功率因数为0.92，需要客户指定线路结构。

   十，如何降低0.5T串联中频炉的电耗？

   适当提高电源功率。加快熔化速度。每炉不要出尽铁水，只要一点点就有利于炉料熔化。排顺金属料，尽量不让它卡住，能够顺利熔落、特别注意生铁等熔点低外形规范，应该排顺在感应圈附近，感应电流较大熔化较快，下落快，有利于形成熔池，进一步熔化全部炉料。筒管类炉料不要切割，因为它的感应电流连续，有利于功率提高。

   十一，怎样提高0.5T串联中频炉的熔化速度？

1. 加大中频感应熔化炉中频电源的功率。

2. 选择合理的炉料尺寸及正确的加料方式。

3. 适当的铁水出炉温度。

   十二、中频炉操作需要注意什么?

   相工频交流电转变为直流电，再经逆变电路输出成为单项的中频交流电的转换后，根据电磁感应原理实现对金属的热处理。但为了保证中频炉能够高效作业，对其进行安全操作是必须的，下面就如何进行安全操作，本文进行详细叙述。

   1，开炉前的注意事项

   中频电炉在开炉前必需要对电气设备、水冷却系统、感应器铜管等进行检查，只有在这几个设备完好的情况下才能开安全运作中频炉的正确方法解析

   中频炉是一种用于铸造锻造及热加工的设备，由变频装置、炉体和炉前控制等几个部分组成的，通过将三炉，确保热处理的安全性，否则禁止开炉;确定专门负责送电和开炉的人员，并且负责人员不得擅自离开岗位，工作期间必需对感应器和坩埚的外部情况进行监管，以防止有人在送电后触碰感应器和电缆，影响中频电炉的正常作业或发生安全意外。

   2，开炉后的注意事项

   中频炉开炉后，在进行装料时，应对炉料内进行检查，避免混入易燃易爆等有害物品。为了防止结盖现象的出现，严禁在钢液中直接加入冷料和湿料，以及在熔化液充满到上部后不得加入体积较大的块料;为避免出现爆炸意外，必需确保浇注场地和炉前地坑无积水，无障碍物;而在进行浇注时需两人配合进行，而剩余的钢液只能倒在在制定地点，不能随处乱倒。

   3，维护保养时的注意事项

   在对中频电炉进行维护保养时，应保持中频发电机房内的清洁，严禁易燃易爆的物品堆放。对熔损过度的炉膛及时进行修补，在补炉时要避免铁屑、氧化铁混入，保证坩埚的密实。

   导致中频炉事故的几个主要因素?

   十三、中频炉爆炸事故的原因有：

   1．炉料中有潮湿的原料导致蒸汽爆炸。

   2．测温取样或者在加合金时缺少操作技巧，导致金属液飞溅。

   3．投入大状金属料进入炉内导致铁液飞溅。

   4．不合理的加料制度导致架桥。

   5．未能在安全线外进行躲避导致受伤。

   6．接触电源导体，安全联锁控制失效或者接触未完全放电的电容等导致电击休克或死亡。

   7．缺少适当的安全培训。

   十四，中频炉化钢的要点

   1，化钢的任务

   熔化的主要原料是废钢和一部分生铁。外购进来的废钢锈多，夹有泥砂及其他脏物，钢中硫磷的含量也较高。化钢的任务就是要把上述条件的原料冶化成气体和夹杂含量低、成分合格、温度符合要求的优质钢液。具体说来，化钢的基本任务是：

   （1）熔化固体炉料（生铁、废钢等）；

   （2）使钢水中的硅、锰、碳等元素达到规格成分；

   （3）去除有害元素硫和磷，将它们的含量降到规定的限量以下；

   （4）清除钢水中的气体和非金属夹杂，使钢水纯净；

   （5）加入合金元素（熔化合金钢），使其符合要求；

   （6）将钢水过热至一定温度，保证浇注的需要；

   （7）为了提高产量和降低成本，必须快速化钢；

   （8）浇注成良好的铸件。

   2，化钢的方法

   化钢的方法有很多，主要有感应炉化钢、平炉化钢、电弧炉化钢等。

   在铸钢车间上普遍应用的电弧炉和感应电炉。它们对原材料要求较松，化出的钢水质量较高，而且化钢周期适合于铸钢生产的特点，开炉、停炉都比较方便，容易与造型、合箱等工序的进度相协调，便于组织生产。另外，电炉化钢的设备比较简单，投资少，基建速度以及资金回收快。

   近年来，感应炉化钢逐渐发展。感应炉化钢工艺比较简单，钢水质量也能得到保证。不少的工厂用感应炉化钢来浇注小铸件，特别是熔模精密铸造车间，广泛采用感应电炉来熔化钢水。

   在重型机器厂中，至今还使用平炉化钢，平炉的容量一般比电炉大，用平炉化钢能一次化出大量的钢水，适用于浇庞大而复杂的重型铸件。但是，平炉化钢的周期长，化出一炉钢的时间一般需要六小时以上。平炉结构庞大而复杂，产量低，钢水质量不如电炉，因此它的发展受到很大的限制。在有些国家，已不再建新的平炉了。

   近几十年来，化钢工业中广泛应用纯氧顶吹转炉来化钢，这种化钢方法速度快，生产率高，钢水质量也得到保证，这种炉子较适用于钢锭生产。

   随着生产和科学技术的发展，直流电弧炉、真空感应电炉以及炉外精化设备的新的化钢方法不断出现，熔化出来的钢水质量大大提高，铸件质量大为改善。

   影响中频炉能耗的因素有哪些？

    十五、影响中频炉能耗的因素主要有以下4点：

   1、电源

   中频炉功率密度配置的高低。配置高，熔化速度快，节能效果好。中频炉能否保持高功率持续向炉内送电力，会影响到能耗的高低的；中频炉电源线排布杂乱，会影响电源的处理能力，导致电力不稳定，电源转换效率低，影响能耗。 

   2、熔化物

   炉料表面的干净程度，如有5％杂物，要耗费5％的电能去熔化这些杂质，还会影响炉衬寿命；炉料块长度合适与否会影响电炉的电效率和熔化质量，一般以200～300mm块度为宜；

   3、耐火材料 

   使用合适的坩埚可以提高熔化率，石英坩埚耐高温，搭配中频炉使用，坩埚内的金属材料通过感应加热自身产生热量，可降低热量传递的消耗。

   4、不恰当操作造成高能耗 

   金属液过热、不停炉出液。不但不安全，从能耗和熔化工艺上也是错误的。一般电炉感应器分上下两部分，当炉内金属液面低于上部感应器一半以下时，由于电阻变化，上部感应器不再有感应电流通过，而全部集中在下部感应器，使下部金属液过热，冲刷炉壁，炉衬寿命急剧下降。

   十六、中频炉怎么样比较省电呢 ?

   1、在确保工人合理运行的前提下，布局的合理性，电炉的整体布局，我们应尽量减少空间布局，以缩短整体连接线，这将减少火电的损失和节电的目的。

   2、使用的材料应尽可能大，以确保电流平稳流动，以防止铜排过小，导致热量带走部分电力。

   3、工人要勤快，要不断的加料并辅助搅拌钢铁，提高熔化速度，节约电耗

   4、中频炉的技术含量，这一点各使用厂家不好确定。虽然中频炉技术相对成熟，但各家仍然有其自身的一定优势。因此，建议制造商选择大型制造商在购买电炉时进行合作。确保节省电力消耗。

   十七、中频炉磁轭温度过高是什么原因?

   磁轭发红是中频电源运行中一种比较常见的故障现象。首先检查冷却水系统是否有问题，检查发红磁轭进出水是否正常，管路有无老化漏水，若正常，则再对以下几个方面进行检查。

   (1)中频电源磁轭老化，层匝间绝缘涂层腐蚀严重，对此可打开硅钢片进行表面涂层处理。

   (2)磁轭粘上钢液（铁屑），对此可打磨磁轭，清除粘上的铁屑。

   (3)检查炉底厚度，炉底打得过厚也会导致磁轭发热发红。

   (4)循环水进水温度过高，磁轭循环系统内部水温过高产生气体，由于气体无法排出，循环水无法循环，引起温度升高。

   5）循环水压力变小，或水路有改动后，水路变多或水管变大，其他回路水流量变大，引起磁轭水流量变小。

   十八、IGBT中频炉真的比SCR中频炉节电吗？

   条件相同的条件下，IGBT电炉比SCR电炉节电0.0976％，几乎可以忽略。

   IGBT是新型开关器件，开关速度快，加控制信号导通，去掉控制信号截止，控制方便，导通压降低，功耗低。IGBT的最大电流只有额定电流的2倍，耐冲击能力差。SCR是传统的开关器件，控制功率大，耐冲击能力强。IGBT电炉真的比SCR电炉节电吗?我们通过以下计算，就可以看出是否节电。

   　　1吨的电炉如功率为500KW,进相电压380V,IGBT电炉的功率因数为0.98，直流电流为928A，4个IGBT消耗的功率为　[1V(IGBT导通压降）X　928A/2]　X　4=1856W=1.856KW；SCR电炉的功率因数为0.93，直流电流为977A,SCR消耗的功率为：[1.2V(SCR导通压降）X977A/2]　X　4=2344W=2.344KW,有此可以看出，IGBT消耗的功率比SCR消耗的功率省了21％。

   　　由此得出IGBT电炉比SCR电炉节电21％，那就错了，我们继续计算，IGBT消耗的功率是总功率的百分比为1.856KW/500KW=0.003712=0.3712%;SCR消耗的功率是总功率的百分比为2.344KW/500KW=0.004688=0.4688%.有以上计算数据可以看出，在其它条件相同的条件下，IGBT电炉比SCR电炉节电0.0976％，几乎可以忽略。

   　　如改变其它条件，IGBT电炉采用串联逆变，通过提高中频电压节电，那就是另外回事了。SCR电炉可以通过2倍压提高中频电压，由于SCR的耐压、电流比IGBT器件高的多，SCR电炉可以采用高进相电压、高中频电压，因此SCR电炉如设计合理，比价格昂贵的IGBT电炉要更加节电。

   SCR电炉可以采用高进相电压、高中频电压，因此SCR电炉如设计合理，比价格昂贵的IGBT电炉要更加节电。

    

 

Title: 0.5T series IF furnace - mainly used in molten steel, iron, copper, aluminum and other alloys, as a series inverter circuit configuration of the inverter frequency furnace series 0.5T

Keywords: 0.5T series intermediate frequency furnace

Description: 0.5T series intermediate frequency furnace is a 0.5T medium frequency electric furnace and also a 0.5T medium frequency induction electric furnace . It provides a good method for quickly selecting " 0.5T series intermediate frequency furnace " , providing 0.5T series intermediate frequency furnace price , 0.5Tseries intermediate frequency furnace body structure selection. select series 0.5T IF furnace reasons power factor 0.96. 

0.5T series intermediate frequency furnace

First, how to quickly choose a good 0.5T series intermediate frequency furnace ?

Description: 0.5T power factor

The power factor of the series intermediate frequency furnace is high: ≥0.9 6 , because all the thyristors in the rectification part of the power supply are in the fully open state , the rectifier circuit is always in the all-on state, and the rising power is realized by adjusting the voltage of the series inverter bridge . Therefore, the entire operation process (including low power, medium power, high power) can ensure that the equipment is always in a high efficiency stage.

Parallel intermediate frequency furnace power factor is low: ≤0. 92 , because all the thyristors in the rectification part of the power supply are in a semi-open state (adding additional compensation according to the requirements of the national grid). The power regulation of the parallel line is adjusted by the rectification conduction angle, so At low power, the power factor of the power system is very low, generally between 40% and 80%; the high harmonics are large and seriously interfere with the power grid .

Second , the main purpose of the 0.5T series intermediate frequency furnace

0.5T series IF melting furnace is mainly applied to steel, iron, copper, aluminum and alloys, having a high melting efficiency, energy-saving effect, a uniform metal composition, burning small, quick temperature rise, easy temperature control and so, for various metal melt.

Third , 0.5T series intermediate frequency furnace consists of:

400kw series intermediate frequency power supply - steel shell furnace body - water cooled cable - remote console - ZXZ- 40T closed loop cooling tower.

Four , 0.5T series intermediate frequency furnace price summary table

The price of the 0.5T series intermediate frequency furnace is calculated according to the power of the intermediate frequency power supply and the volume of the furnace body. Different configuration prices vary. This price is for reference only. Contact us will have a very low price, please consult the specific price. Firs T furnace@gmail.com   

0.5T series intermediate frequency furnace item price

5. The power supply , tonnage and power consumption of the 0.5T series intermediate frequency furnace .

Sixth , 0.5T series intermediate frequency furnace circuit diagram :

Seven , the reason for choosing 0.5T series intermediate frequency furnace :

(1)        The whole machine can realize fool-like operation to avoid accidents caused by operational errors.

(2)        The rectification inverter is completed by a power potentiometer and buffers the soft start. Self-judgment of the load state, if the load is short-circuited or open circuit, the zero-impact, micro-current lock-controlled inverter output can be used to avoid further expansion of the fault.

(3)        High power factor, low harmonic interference. The power factor of the whole machine is comφ≥0.9 6 , no need to configure reactive power compensation and harmonic elimination device , and reduce investment in construction .

(4)        The inverter pulse width and commutation dead time can be flexibly adjusted to suit various load frequencies.

(5)        High start-up success rate : 100% start-up for any load condition , with high load adaptability: high power factor full load output even in the cold furnace (cold) state.

(6)        Extremely high power saving effect: the relative parallel resonance rate is 20~30% , the reason is as follows

(1) , the turn-off loss is small. Since the series resonance is a natural commutation, there is no commutation overlap angle, so there is no turn-off loss;

(2 ) High-voltage characteristic series resonance belongs to voltage resonance, the inductor voltage is Q times of the output voltage , and 1500V-4000V high voltage can be obtained without double voltage or transformer boosting . Each current of the inverter output flows through the inductive load. Relative parallel

Vibration, the channel current is 2-3 times smaller . This high voltage, low current characteristic results in a significant reduction in tank losses.

(3) Low-reactive loss series resonance belongs to voltage resonance, DC filter adopts capacitive filtering. When normal operation, the rectifier bridge is in full open state, and the power factor of the grid reaches cosφ≥0.9 6 or more, plus low harmonic loss and long electrical efficiency. Above

Parallel resonance.

u High compatibility: The board reserves IGBT drive interface, temperature control interface, remote control interface and online blocking protection interface. The IGBT driver board can directly drive the IGBT module; the temperature controller (or computer) can realize programmable temperature control.

u Good environmental performance: Relative to parallel resonance, the sound of the whole machine is smooth and brittle, no clutter noise, and the IF harmonics of the power grid are extremely small. Eight , what is the choice of 0.5T series intermediate frequency furnace body structure ?

0.5T series IF furnace furnace furnace shell consists of four parts, an induction coil, lining, etc. gearbox tilting furnace furnace structure wherein selecting two ways: to supply aluminum to melt reducer tilting furnace configuration mode The furnace is commonly known as the aluminum shell furnace. The inductionmelting furnace of the steel structure with the hydraulic cylinder as the tilting furnace is commonly called the steel shell furnace. The steel shell furnace is a steel structure , and the aluminum shell furnace shell material is an aluminum alloy . Because of the volume of the 0.5T series intermediate frequency furnace , aluminum shell furnace and steel shell furnace have customers to choose, and domestic steel shell furnaces are mostly.

Nine, customers need to provide any information to the vendor before buying 0.5T series IF furnace?

1. 0.5T series intermediate frequency furnace should have layout space, need to provide the area and layout of the plant

2. The customer needs to provide the capacity of the transformer, the magnitude of the incoming line voltage, and the frequency of the incoming line voltage.

3. The medium frequency induction furnace needs water cooling equipment, and the configuration of the 0.5T series intermediate frequency furnace contains water cooling equipment.

4. The structure of the medium frequency induction melting furnace has a steel shell furnace body and an aluminum shell furnace body, and the customer needs to specify the furnace body structure.

5. The power supply of the medium frequency induction melting furnace is the intermediate frequency power supply. The line structure of the intermediate frequency power supply is divided into the inverter parallel and the inverter series structure. The inverter series structure is energy-saving, the power factor is 0.98 , and the line is stable. The inverter parallel structure is a parallel type with a power factor of 0.92 , which requires the customer to specify the line structure.

Ten , how to reduce the power consumption of the 0.5T series intermediate frequency furnace ?

Properly increase the power supply. Accelerate the melting speed. Do not use hot metal in each furnace, as long as it is a little bit beneficial to the melting of the charge. Drain the metal material, try not to let it get stuck, can melt down smoothly, pay special attention to the low melting point specification of pig iron, etc. It should be arranged in the vicinity of the induction coil. The induced current is larger and melts faster, and the drop is fast, which is conducive to the formation of the molten pool. Further melting the entire charge. The bobbin-type charge should not be cut because its induced current is continuous, which is conducive to power improvement.

Eleven , how to improve the melting speed of 0.5T series intermediate frequency furnace ?

1.   Increase the power of the intermediate frequency induction melting furnace intermediate frequency power supply.

2.   Choose a reasonable charge size and the correct feeding method.

3.   Appropriate molten iron outlet temperature.

12. What should I pay attention to in the operation of the intermediate frequency furnace ?

The phase-frequency AC power is converted into DC power, and after the inverter circuit output is converted into a single-phase AC power, the metal is heat-treated according to the principle of electromagnetic induction. However, in order to ensure that the intermediate frequency furnace can operate efficiently, it is necessary to carry out safe operation. The following is a detailed description of how to carry out safe operation.

1 , precautions before opening the furnace

The intermediate frequency electric furnace must check the electrical equipment, the water cooling system, the inductor copper tube, etc. before the furnace is opened. Only when these several equipments are in good condition can the correct method of safe operation of the intermediate frequency furnace be analyzed.

IF forging and casting furnace is a thermal processing apparatus for the inverter unit of several parts, the furnace and furnace control other components of the furnace by three, to ensure the safety of the heat treatment, or prohibiting the opening of the furnace; specifically determining The person responsible for power transmission and opening, and the responsible person shall not leave the post without authorization. During the work, the external condition of the sensor and the cymbal must be supervised to prevent people from touching the sensor and cable after power transmission, which affects the normal operation of the intermediate frequency electric furnace. Work or a safety accident.

2 , precautions after opening the furnace

After the intermediate frequency furnace is opened, during the charging, the inside of the furnace should be inspected to avoid mixing with flammable and explosive materials. In order to prevent the occurrence of the capping phenomenon, it is strictly forbidden to directly add the cold material and the wet material in the molten steel, and after the molten liquid is filled to the upper portion, the bulk material should not be added ; in order to avoid the explosion accident, it is necessary to ensure the pouring place and the furnace. There is no water in the front pit, no obstacles . In the pouring, two people need to cooperate, and the remaining molten steel can only be dumped at the place where it is made, and cannot be dumped anywhere.

3 , precautions during maintenance

When maintaining the medium frequency electric furnace, the internal frequency generator room should be kept clean and the flammable and explosive materials should not be stacked. Repair the furnace with excessive melt loss in time, and avoid the incorporation of iron filings and iron oxide in the furnace to ensure the compaction of the crucible.

What are the main factors that cause the accident in the intermediate frequency furnace ?

13. The causes of the explosion of the intermediate frequency furnace are:

1 . The presence of moist materials in the charge causes a steam explosion.

2 . Temperature sampling or lack of operating skills when adding alloys, causing splashes of molten metal.

3 . Injecting large metal materials into the furnace causes the molten iron to splash.

4 . Unreasonable feeding system leads to bridging.

5 . Failure to escape outside the safety line resulted in injury.

6 . Contact with the power conductor, safety interlock control failure or contact with incompletely discharged capacitors, etc., resulting in shock or death.

7 . Lack of proper safety training.

Fourteen, the main points of medium frequency furnace steel

1 , the task of steel

The main raw material for melting is scrap steel and a part of pig iron. The purchased scrap has more rust, muddy sand and other dirt, and the content of sulfur and phosphorus in the steel is also high. The task of the steel is to smelt the raw materials of the above conditions into high-quality molten steel with low gas content, high inclusion content, qualified components and temperature. Specifically, the basic tasks of the steel are:

( 1 ) melting solid charge (cast iron, scrap, etc.);

( 2 ) making the elements such as silicon, manganese and carbon in the molten steel reach the specification components;

( 3 ) removing harmful elements such as sulfur and phosphorus and reducing their content below the specified limit;

( 4 ) removing gas and non-metallic inclusions in the molten steel to make the molten steel pure;

( 5 ) adding alloying elements (melted alloy steel) to meet the requirements;

( 6 ) The molten steel is superheated to a certain temperature to ensure the need for pouring;

( 7 ) In order to increase production and reduce costs, it is necessary to rapidly reduce steel;

( 8 ) Casting into a good casting.

2 , the method of steel

There are many methods for chemical steel, mainly including induction furnace steel, open hearth steel, and electric arc furnace steel.

Electric arc furnaces and induction furnaces commonly used in cast steel workshops. They have looser requirements on raw materials, higher quality of molten steel, and the steelmaking cycle is suitable for the characteristics of cast steel production. It is convenient to open and stop the furnace, and it is easy to coordinate with the progress of the process of molding and boxing. Organize production. In addition, the equipment for electric furnace steel is relatively simple, with less investment, and the infrastructure construction speed and capital recovery are fast.

In recent years, induction furnace steel has gradually developed. Induction furnace steel process is relatively simple, and the quality of molten steel can be guaranteed. Many factories use induction furnace steel to cast small castings, especially in investment casting foundries, and widely use induction furnaces to melt molten steel.

In the heavy machinery factory, flat furnace steel has been used so far. The capacity of the open hearth furnace is generally larger than that of the electric furnace. The flat steel can be used to produce a large amount of molten steel at one time, which is suitable for pouring large and complex heavy castings.However, the cycle of open hearth steel is long, and the time for producing a furnace steel generally takes more than six hours. The open hearth structure is large and complex, the output is low, and the quality of the molten steel is not as good as that of the electric furnace, so its development is greatly limited. In some countries, new open hearths are no longer built.

In recent decades, pure steel top-blown converters have been widely used in the steel industry to convert steel. This method of steelmaking is fast, high in productivity, and the quality of molten steel is also guaranteed. This type of furnace is more suitable for steel ingot production.

With the development of production and science and technology, new steelmaking methods for DC arc furnaces, vacuum induction furnaces and refining equipment outside the furnace have emerged, the quality of molten steel has been greatly improved, and the quality of castings has been greatly improved.

What are the factors that affect the energy consumption of the intermediate frequency furnace?

  Fifteen, the factors affecting the energy consumption of the intermediate frequency furnace are mainly the following four points:

1 , power supply

The frequency density configuration of the intermediate frequency furnace is high. The configuration is high, the melting speed is fast, and the energy saving effect is good. Whether the intermediate frequency furnace can maintain high power and continuously send power to the furnace will affect the energy consumption; the intermediate frequency furnace power supply line is disorderly, which will affect the power processing capacity, resulting in unstable power, low power conversion efficiency, and influence energy. Consumption.  

2 , the melt

The cleanliness of the surface of the charge, such as 5 % impurities, will consume 5 % of the electrical energy to melt these impurities, and will affect the life of the lining; the appropriate length of the furnace block will affect the electrical efficiency and melting quality of the electric furnace, generally200 ~ 300mm block is suitable;

3 , refractory materials  

The use of a suitable crucible can increase the melting rate, the quartz crucible is resistant to high temperatures, and is used with an intermediate frequency furnace. The metal material in the crucible generates heat by induction heating, which can reduce the heat transfer consumption.

4 , improper operation causes high energy consumption  

The molten metal is overheated and the liquid is discharged from the furnace. Not only is it unsafe, it is also wrong in terms of energy consumption and melting process. Generally, the electric furnace sensor is divided into two parts. When the metal liquid level in the furnace is lower than half of the upper inductor, the upper inductor no longer has an induced current passing due to the resistance change, and all of the lower inductors are concentrated in the lower inductor to make the lower metal liquid. Overheating, flushing the furnace wall, the life of the lining drops sharply.

Sixteen, how to save power in the intermediate frequency furnace?   ?

1. Under the premise of ensuring the reasonable operation of the workers, the rationality of the layout, and the overall layout of the electric furnace, we should minimize the space layout to shorten the overall connection line, which will reduce the loss of thermal power and save electricity.

2 , the material used should be as large as possible to ensure a smooth flow of current to prevent the copper row too small, causing the heat to take away part of the power.

3, to be diligent workers, and to continue feeding the auxiliary stirring steel, increase the speed of melting, saving power consumption

4 , the technical content of the intermediate frequency furnace, this point is not well determined by the manufacturers. Although the intermediate frequency furnace technology is relatively mature, each family still has its own certain advantages. Therefore, manufacturers are advised to choose large manufacturers to cooperate when purchasing electric furnaces. Make sure you save on power consumption.

XVII yoke IF furnace temperature is too high what is the reason?

The yoke redness is a common failure phenomenon in the operation of the intermediate frequency power supply. First check if there is any problem with the cooling water system, check whether the red yoke inlet and outlet water is normal, and whether the pipeline is aging or leaking. If it is normal, check the following aspects.

(1) The yoke of the intermediate frequency power supply is aging, and the interlayer insulating coating is severely corroded. For this, the silicon steel sheet can be opened for surface coating treatment.

(2) The yoke is adhered to the molten steel (iron filings), and the yoke can be polished to remove the adhered iron filings.

(3) Check the thickness of the bottom of the furnace. If the bottom of the furnace is too thick, it will cause the yoke to heat up and become red.

(4) The temperature of the circulating water inlet water is too high, and the water temperature inside the yoke circulation system is too high to generate gas. Since the gas cannot be discharged, the circulating water cannot circulate, causing the temperature to rise.

5 ) The circulating water pressure becomes smaller, or after the waterway is changed, the waterway becomes more or the water pipe becomes larger, and the water flow of the other circuits becomes larger, causing the yoke water flow to become smaller.

18. Is the IGBT intermediate frequency furnace really more energy efficient than the SCR intermediate frequency furnace?

Under the same conditions, the IGBT electric furnace saves 0.0976 % more energy than the SCR electric furnace , which is almost negligible.

IGBT is a new type of switching device, with fast switching speed, plus control signal conduction, eliminating control signal cut-off, convenient control, reduced conduction voltage and low power consumption. The maximum current of the IGBT is only 2 times the rated current, the impact resistance is poor. SCR is a traditional switching device with high control power and high impact resistance. Is the IGBT electric furnace really more energy efficient than the SCR electric furnace ? We can see whether the power is saved by the following calculation.

　　 1 t The power of 500KW electric furnace, into the phase voltage 380V, IGBT electric power factor is 0.98, the DC current is 928A, the power consumed by the IGBT 4 [1V (IGBT conduction voltage drop) X 　 928A/2] 　 X 　 4=1856W=1.856KW ; SCR electric furnace has a power factor of 0.93 and DC current is 977A. The power consumed by SCR is: [1.2V ( SCR conduction voltage drop) X977A/2] 　 X 　 4=2344W=2.344KW. It can be seen that the power consumed by the IGBT is 21 % lower than the power consumed by the SCR .

It is concluded that the IGBT electric furnace saves 21 % compared with the SCR electric furnace . It is wrong. We continue to calculate that the power consumed by the IGBT is 1.56KW/500KW=0.003712=0.3712% of the total power ; the power consumed by the SCR is the total power. The percentage is2.344KW/500KW=0.004688=0.4688%. It can be seen from the above calculation data that under the same conditions, the IGBT electric furnace saves 0.0976 % compared with the SCR electric furnace , which is almost negligible.

If other conditions are changed, the IGBT electric furnace adopts series inverter, and by increasing the intermediate frequency voltage to save electricity, that is another matter. SCR electric furnace can increase the intermediate frequency voltage by 2 times voltage. Since the withstand voltage and current of SCRare much higher than IGBT devices, SCR electric furnace can adopt high phase voltage and high intermediate frequency voltage. Therefore, SCR electric furnace is reasonable in design and expensive IGBT. Electric furnaces should be more energy efficient.

SCR electric furnace can use high phase voltage and high intermediate frequency voltage. Therefore, if the SCR electric furnace is designed reasonably, it is more energy-saving than the expensive IGB T electric furnace.

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