WO2019232908A1 - 一种便于高炉后期测温的热电偶新安装方法 - Google Patents

一种便于高炉后期测温的热电偶新安装方法 Download PDF

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WO2019232908A1
WO2019232908A1 PCT/CN2018/098259 CN2018098259W WO2019232908A1 WO 2019232908 A1 WO2019232908 A1 WO 2019232908A1 CN 2018098259 W CN2018098259 W CN 2018098259W WO 2019232908 A1 WO2019232908 A1 WO 2019232908A1
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thermocouple
blast furnace
hole
cooling wall
temperature measurement
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PCT/CN2018/098259
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English (en)
French (fr)
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辛虹霓
姜洪军
陈诚
刘刚
林磊
曾辉
李传辉
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莱芜市天铭冶金设备有限公司
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Publication of WO2019232908A1 publication Critical patent/WO2019232908A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices

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  • the invention relates to the technical field of blast furnace temperature measurement, in particular to a new method for installing a thermocouple, which is convenient for temperature measurement in the later period of the blast furnace.
  • the furnace body of a blast furnace is composed of a furnace shell, a cooling wall, a pounding layer, a carbon brick layer, and a ceramic layer provided from the outside. Due to long-term high-temperature corrosion, each layer of the furnace body will spall from the inside to the outside. The furnace body is eroded. In order to grasp the degree of damage to the furnace body so that measures can be taken in time.
  • a thermocouple is set in the furnace body. The temperature detected by the thermocouple is combined with the material of each layer to obtain the furnace body. The extent of erosion. However, during actual use, the blast furnace will have relatively severe erosion in the later stages of use.
  • thermocouple preset during the construction of the blast furnace will fail under the influence of long-term high temperature and harsh environment on site, and some will lose the temperature measurement.
  • the performance, or the large temperature measurement deviation, has seriously affected the judgment of the degree of damage to the furnace.
  • the current method is to install a thermocouple on the furnace shell, but because the temperature of the shell is greatly affected by the external environment, the measured temperature of the thermocouple after installation also has a large deviation. Sexual deficiencies.
  • the invention aims at the shortcomings of the prior art, and provides a new method for installing a thermocouple that is convenient for the later temperature measurement of a blast furnace. After the preset galvanic couple fails, the temperature of the carbon brick layer can be directly measured to judge the temperature of the furnace body. The degree of erosion provides a reliable basis.
  • the present invention is achieved through the following technical solutions, and provides a new method for installing a thermocouple that is convenient for later temperature measurement of a blast furnace, and includes the following steps:
  • a through hole is machined axially on the fixing bolt of the cooling wall, and at least one end of the through hole is sealed.
  • the through hole is provided to provide space for the installation of the new thermocouple, and at least one end Sealing can prevent gas overflow in the blast furnace and ensure environmental safety;
  • the cooling wall is connected to the blast furnace shell through the cooling wall fixing bolts, and the end of the cooling wall fixing bolts protruding to the outside of the furnace shell is sealed, which can facilitate the installation of new thermocouples outside the furnace shell;
  • thermocouple in the blast furnace When the preset thermocouple in the blast furnace reaches the end of its useful life and cannot be measured in a timely and accurate manner, remove the seal on the stud bolts, insert the new thermocouple into the through hole, and pass the temperature measurement end of the new thermocouple through the furnace shell. The ramming layer, the top to the carbon brick layer, and then the new thermocouple and the inner wall of the through hole are sealed. The temperature of the carbon brick layer is measured using the new thermocouple, and then the furnace body blanket can be obtained according to the material and thermal conductivity of each layer. The extent of erosion.
  • the sealing of the through hole in the step (1) means that a detachable sealing plug is provided at the end of the through hole.
  • the setting of this optimization scheme can easily and quickly remove the seal when installing a new thermocouple, reducing the difficulty of construction, greatly improving the installation efficiency, and shortening the downtime.
  • the sealing plug is hermetically connected to the inner wall of the through hole through a refractory ramming material or a taper pin or thread. It is easy to install and disassemble, and also plays a good role in sealing to avoid gas overflow.
  • both ends of the through hole are sealed and a sealing plug is inserted at one end protruding into the furnace shell. Both ends of the through hole are sealed to prevent gas from overflowing and prevent ramming material from entering the through hole, thereby preventing the through hole from being blocked.
  • a sealing plug is inserted at the end of the through hole facing the furnace shell, which reduces the It is difficult to remove the seal when installing a new thermocouple, and the seal plug can be directly ejected by a shaft-shaped tool.
  • the failure to accurately measure the service life in the step (3) means that the temperature of the blast furnace hearth exceeds the normal temperature, and the preset thermocouple in the blast furnace fails to recover.
  • the installation of new thermocouples within this period not only avoids the waste of premature installation, but also avoids the mistake of judging the erosion degree of the furnace due to the late installation.
  • the through hole is coaxial with the cooling wall fixing bolt, and the inner diameter of the through hole is 2 mm to 28 mm.
  • the setting of this optimization scheme provides the installation space for the new thermocouple while ensuring the strength of the stud bolts.
  • each cooling wall is connected to the furnace shell by at least two cooling wall fixing bolts. Because there are hundreds of cooling walls in the furnace body, after the new thermocouple is installed in this optimization scheme, each new thermocouple forms a network, and the locations of temperature measurement points increase, which makes the judgment of the degree of furnace corrosion more accurate.
  • the beneficial effect of the present invention is: by processing through holes on the fixing bolts of the cooling wall, when the blast furnace is used until the preset galvanic coupler fails, a new thermocouple is installed in the through hole, and the temperature of the carbon brick layer can be measured to ensure Accurate determination of furnace body erosion degree to avoid accidents due to furnace body leakage; when this method is used to install a new thermocouple, the occupation time is short, and the downtime caused by installing a new thermocouple is greatly reduced.
  • FIG. 1 is a schematic structural diagram of a furnace body in the present invention
  • the blast furnace shown in Fig. 1 has a furnace shell 3, a cooling wall 4, a ramming layer 5, a carbon brick layer 6, and a ceramic layer 7 in order from the outside to the inside.
  • the outside is gradually eroded, and the preset thermocouple fails when it is newly built or overhauled under the influence of high temperature and harsh environment on site. Therefore, it is impossible to accurately judge the erosion of the furnace body in the later stage of the blast furnace.
  • thermocouple This embodiment provides a new method for installing a thermocouple, which is convenient for the later temperature measurement of the blast furnace, and includes the following steps:
  • a through hole is machined on the cooling wall fixing bolt 2 in the axial direction, and two ends of the through hole are sealed. One end is sealed by a threaded connection at the end of the through hole, and the other end is inserted. With sealing plug.
  • the sealing plug can also be sealed with the through hole by refractory ramming material or taper pin.
  • the through hole is coaxial with the cooling wall fixing bolt, and the inner diameter of the through hole is 2 mm to 28 mm.
  • the cooling wall is connected with the blast furnace shell through the cooling wall fixing bolts 2, and each cooling wall is connected with the furnace shell through at least two cooling wall fixing bolts.
  • the end of the cooling wall fixing bolts extending outside the furnace shell is provided.
  • One end of the sealing plug and the other end are provided with a regular quadrangle trapped in the cooling wall.
  • thermocouple in the blast furnace When the preset thermocouple in the blast furnace has reached the end of its useful life and cannot be measured in a timely and accurate manner, remove the sealing plug on the fixing bolt of the cooling wall, and use a shaft tool to eject the sealing plug, and then insert a new thermocouple 1 into the through hole Inside, the new thermocouple is sealedly connected to the inner wall of the through hole through the thread, and the temperature measurement end of the new thermocouple 1 is passed through the ramming layer 5, top to the carbon brick layer 6, and finally the new thermocouple is sealed to the inner wall of the through hole Handle to prevent gas from overflowing in the furnace.
  • the failure to reach the service life in this step and timely and accurate measurement means that the temperature of the blast furnace hearth exceeds the normal temperature, and the preset thermocouple in the blast furnace fails to recover.
  • thermocouple is reserved in the fixing bolt of the cooling wall, thereby solving the problem of inaccurate temperature measurement caused by the failure of the preset thermocouple and avoiding erosion of the furnace body. Accuracy of degree judgment led to the leakage of the furnace body.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

一种便于高炉后期测温的热电偶新安装方法，包括如下步骤： (1)冷却壁(4)安装之前，在冷却壁固定螺栓(2)上沿轴向加工出通孔，并将所述通孔的至少一端密封； (2)通过冷却壁固定螺栓(2)将冷却壁(4)与高炉炉壳(3)连接，冷却壁固定螺栓(2)伸至炉壳(3)外的一端密封； (3)高炉内的预设热电偶达到使用期限无法及时准确测量时，去除冷却壁固定螺栓(2)上的密封，将新热电偶(1)插入通孔内，并使新热电偶(1)的测温端穿过炉壳捣料层(5)、顶至碳砖层(6)，然后将新热电偶(1)与通孔内壁之间密封处理。

Description

一种便于高炉后期测温的热电偶新安装方法 技术领域
本发明涉及高炉测温技术领域，尤其涉及到一种便于高炉后期测温的热电偶新安装方法。
背景技术
目前高炉的炉体由自外而内设置的炉壳、冷却壁、捣料层、碳砖层和陶瓷层组成，由于长期的高温腐蚀，炉体的各层会由内而外产生剥落，最终导致炉体被蚀透，为了掌握炉体受损的程度，以便及时采取措施，在建造高炉时，会在炉体内设置热电偶，通过热电偶检测到的温度，结合各层材质，得到炉体被侵蚀的程度。但是，实际使用过程中，高炉的使用后期会出现较为严重的侵蚀，而此时，高炉建造时预设的热电偶在长期高温和现场恶劣环境的影响下，出现失效现象，有的失去测温性能，或者出现测温偏差较大的情况，因此严重影响了对炉体损坏程度的判断。
为了解决这一情况，目前采用的方式是在炉壳上加装热电偶，但是由于外壳的温度受外部环境影响较大，因此加装后的热电偶所测温度同样存在较大偏差，可参考性仍存在不足。
发明内容
本发明针对现有技术的不足，提供一种便于高炉后期测温的热电偶新安装方法，在预设电偶失效后，可以直接测得碳砖层的温度，为工作人员判断炉体的受侵蚀程度提供可靠依据。
本发明是通过如下技术方案实现的，提供一种便于高炉后期测温的热电偶新安装方法，包括如下步骤：
(1)冷却壁安装之前，在冷却壁固定螺栓上沿轴向加工出通孔，并将所述通 孔的至少一端密封，通过设置通孔为新热电偶的安装提供空间，至少将其一端密封可以防止高炉内的煤气溢出，保证环境安全；
(2)通过冷却壁固定螺栓将冷却壁与高炉炉壳连接，冷却壁固定螺栓伸至炉壳外的一端密封，可以方便工作人员在炉壳外进行新热电偶的安装；
(3)高炉内的预设热电偶达到使用期限无法及时准确测量时，去除冷却壁固定螺栓上的密封，将新热电偶插入通孔内，并使新热电偶的测温端穿过炉壳捣料层、顶至碳砖层，然后将新热电偶与通孔内壁之间密封处理，利用新热电偶测得碳砖层温度，然后根据各层材质、导热等参数即可获得炉体被侵蚀的程度。
作为优化，所述步骤(1)中通孔的密封是指在通孔端部设置可拆卸的密封堵头。本优化方案的设置，在安装新热电偶时，可以非常方便、快捷的将密封去除，降低了施工难度，并大幅提高了安装效率，缩短了停工时间。
作为优化，所述密封堵头通过耐火捣打料或锥度销或螺纹与通孔内壁密封连接。既方便安装和拆卸，又起到了较好的密封作用，避免煤气的溢出。
作为优化，所述通孔的两端均密封设置，且在伸入炉壳内的一端插设有密封塞。通孔的两端均密封设置，既避免了煤气的溢出，同时防止了捣料进入通孔内，从而避免了通孔被堵塞，在通孔朝向炉壳内的一端插设密封塞，降低了安装新热电偶时去除密封的难度，可以通过轴状工具将密封塞直接顶掉。
作为优化，所述步骤(3)中的达到使用期限无法及时准确测量是指高炉炉缸温度超出正常温度，且高炉内预设热电偶失效无法恢复。在本期限内安装新热电偶，既避免了过早安装的浪费，又避免了由于安装过晚导致对炉体侵蚀程度判断的失误。
作为优化，所述通孔与冷却壁固定螺栓同轴，且通孔的内径为2mm～28mm。本优化方案的设置，在给新热电偶提供安装空间的同时，保证了冷却壁固定螺栓的强度。
作为优化，步骤(2)中，每块冷却壁通过至少两件冷却壁固定螺栓与炉壳连接。由于炉体内设置上百件的冷却壁，因此本优化方案在安装完新热电偶后，各新热电偶形成网状，测温点的位置增多，使得对炉体侵蚀程度的判断更准确。
本发明的有益效果为：通过在冷却壁固定螺栓上加工通孔，在高炉使用至预设电偶失效时，在通孔内安装新热电偶，可以测得碳砖层的温度，以保证对炉体侵蚀程度的准确判断，避免炉体出现泄漏而发生事故；本方法在安装新热电偶时，占用时间短，大幅缩短了由于安装新热电偶而造成的停机时间。
附图说明
图1为本发明中炉体结构示意图；
图中所示：
1、新热电偶，2、冷却壁固定螺栓，3、炉壳，4、冷却壁，5、捣料层，6、碳砖层，7、陶瓷层。
具体实施方式
为能清楚说明本方案的技术特点，下面通过具体实施方式，对本方案进行阐述。
如图1所示的高炉，其炉体自外而内依次为炉壳3、冷却壁4、捣料层5、碳砖层6和陶瓷层7，经过长时间的高温侵蚀，炉体自内而外逐渐被蚀掉，在新建或大修高炉时预设的热电偶在高温和现场恶劣环境的影响下失效，因 此在高炉使用的后期不能够准确判断炉体被侵蚀的情况。
本实施例提供了一种便于高炉后期测温的新热电偶安装方法，包括如下步骤：
(1)冷却壁安装之前，在冷却壁固定螺栓2上沿轴向加工出通孔，并将所述通孔的两端密封，一端在通孔端部通过螺纹连接密封堵头，另一端插设有密封塞。密封堵头也可以通过耐火捣打料或锥度销与通孔密封。为了保证冷却壁固定螺栓的强度不受影响，通孔与冷却壁固定螺栓同轴，且通孔的内径为2mm～28mm。
(2)通过冷却壁固定螺栓2将冷却壁与高炉炉壳连接，并且每块冷却壁通过至少两件冷却壁固定螺栓与炉壳连接，冷却壁固定螺栓伸至炉壳外的一端为设有密封堵头的一端，另一端设有卡在冷却壁内的正四边形。
(3)高炉内的预设热电偶达到使用期限无法及时准确测量时，去除冷却壁固定螺栓上的密封堵头，并使用轴类工具将密封塞顶掉，然后将新热电偶1插入通孔内，新热电偶通过螺纹与通孔内壁密封连接，并使新热电偶1的测温端穿过捣料层5、顶至碳砖层6，最后将新热电偶与通孔内壁之间密封处理，以免炉内的煤气溢出。此步骤中的达到使用期限无法及时准确测量是指高炉炉缸温度超出正常温度，且高炉内预设热电偶失效无法恢复。
通过本实施例的方法，在冷却壁固定螺栓内预留用于安装热电偶的通孔，解决了由于预设热电偶失效而导致的测温不准确的问题，避免了由于对炉体受侵蚀程度判断的不准确而导致炉体泄漏的事故。
当然，上述说明也并不仅限于上述举例，本发明未经描述的技术特征可以通过或采用现有技术实现，在此不再赘述；以上实施例及附图仅用于说明本发明的技术方案并非是对本发明的限制，参照优选的实施方式对本发明进 行了详细说明，本领域的普通技术人员应当理解，本技术领域的普通技术人员在本发明的实质范围内所做出的变化、改型、添加或替换都不脱离本发明的宗旨，也应属于本发明的权利要求保护范围。

Claims (7)

  1. 一种便于高炉后期测温的热电偶新安装方法，其特征在于，包括如下步骤：
    (1)冷却壁安装之前，在冷却壁固定螺栓上沿轴向加工出通孔，并将所述通孔的至少一端密封；
    (2)通过冷却壁固定螺栓将冷却壁与高炉炉壳连接，冷却壁固定螺栓伸至炉壳外的一端密封；
    (3)高炉内的预设热电偶达到使用期限无法及时准确测量时，去除冷却壁固定螺栓上的密封，将新热电偶插入通孔内，并使新热电偶的测温端穿过炉壳捣料层、顶至碳砖层，然后将新热电偶与通孔内壁之间密封处理。
  2. 根据权利要求1所述的一种便于高炉后期测温的热电偶新安装方法，其特征在于：所述步骤(1)中通孔的密封是指在通孔端部设置可拆卸的密封堵头。
  3. 根据权利要求2所述的一种便于高炉后期测温的热电偶新安装方法，其特征在于：所述密封堵头通过耐火捣打料或锥度销或螺纹与通孔内壁密封连接。
  4. 根据权利要求1所述的一种便于高炉后期测温的热电偶新安装方法，其特征在于：所述通孔的两端均密封设置，且在伸入炉壳内的一端插设有密封塞。
  5. 根据权利要求1所述的一种便于高炉后期测温的热电偶新安装方法，其特征在于：所述步骤(3)中的达到使用期限无法及时准确测量是指高炉炉缸温度超出正常温度，且高炉内预设热电偶失效无法恢复。
  6. 根据权利要求1所述的一种便于高炉后期测温的热电偶新安装方法，其特征在于：所述通孔与冷却壁固定螺栓同轴，且通孔的内径为2mm～28mm。
  7. 根据权利要求1所述的一种便于高炉后期测温的热电偶新安装方法，其特征在于：步骤(2)中，每块冷却壁通过至少两件冷却壁固定螺栓与炉壳连接。
PCT/CN2018/098259 2018-06-04 2018-08-02 一种便于高炉后期测温的热电偶新安装方法 WO2019232908A1 (zh)

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CN111123829A (zh) * 2020-01-14 2020-05-08 攀钢集团攀枝花钢铁研究院有限公司 钢包高效蓄热烘烤方法
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