一种冷轧退火炉保护气供应系统A protective gas supply system for cold rolling annealing furnace
本发明涉及钢铁冷轧退火炉，具体地涉及一种冷轧退火炉保护气供应系统。The invention relates to an iron and steel cold-rolling annealing furnace, in particular to a protective gas supply system for the cold-rolling and annealing furnace.
钢铁冶金企业冷轧退火炉常采用高纯氢气作为保护气，使用后的保护气作为废气排放。而氢气的制取成本较高，且对生产环境安全等级要求较高；使用完的废气中氢气含量高达80％以上，直接排放不光是对能源的极大浪费，亦对环境造成一定污染，并可能带来安全隐患。Cold rolling annealing furnaces in iron and steel metallurgical enterprises often use high-purity hydrogen as protective gas, and the protective gas after use is discharged as exhaust gas. The production cost of hydrogen is relatively high, and the production environment safety level is required to be higher; the hydrogen content in the exhaust gas after use is as high as 80%, and the direct emission is not only a great waste of energy, but also causes certain pollution to the environment. May bring security risks.
发明内容SUMMARY OF THE INVENTION
本发明旨在提供一种冷轧退火炉保护气供应系统，以解决上述问题。为此，本发明采用的具体技术方案如下：The present invention aims to provide a protective gas supply system for a cold rolling annealing furnace to solve the above problems. For this reason, the concrete technical scheme that the present invention adopts is as follows:
一种冷轧退火炉保护气供应系统，其可包括液氩气化装置和废氩回收循环利用装置，所述液氩气化装置产生的氩气通过第一管路供应至冷轧退火炉，所述废氩回收循环利用装置产生的氩气通过第二管路供应至冷轧退火炉。A protective gas supply system for a cold rolling annealing furnace, which can include a liquid argon gasification device and a waste argon recovery and recycling device, the argon generated by the liquid argon gasification device is supplied to the cold rolling annealing furnace through a first pipeline, The argon generated by the waste argon recovery and recycling device is supplied to the cold rolling annealing furnace through the second pipeline.
进一步地，所述液氩气化装置包括液氩储罐、空温式气化器和调压阀组，所述液氩储罐的出液管连接至所述空温式气化器的入口，所述空温式气化器的出口与所述第一管路连接，所述调压阀组安装在所述第一管路上。Further, the liquid argon gasification device includes a liquid argon storage tank, an air temperature type vaporizer and a pressure regulating valve group, and the liquid outlet pipe of the liquid argon storage tank is connected to the inlet of the air temperature type vaporizer , the outlet of the air-temperature vaporizer is connected to the first pipeline, and the pressure regulating valve group is installed on the first pipeline.
进一步地，所述液氩储罐、空温式气化器和调压阀组均为2套并联设置。Further, two sets of the liquid argon storage tank, the air-temperature vaporizer and the pressure regulating valve group are arranged in parallel.
进一步地，所述废氩回收循环利用装置包括通过相应管路依次连接的预处理塔、加压风机、除氧器和干燥塔，所述预处理塔的进气口与冷轧退火炉的废 氩排放管连接，用于进行物理吸附，以去除废氩中的乳化液、水分及颗粒，所述加压风机用于对预处理后的氩气进行增压，所述除氧器用于对氩气进行脱氧处理，使氩气中的含氧量小于5ppm，所述干燥塔用于对氩气中的水分进一步脱除，使氩气的露点低于-60℃。Further, the waste argon recovery and recycling device includes a pretreatment tower, a pressurizing fan, a deaerator and a drying tower connected in sequence through corresponding pipelines. The argon discharge pipe is connected for physical adsorption to remove emulsion, moisture and particles in waste argon, the pressurizing fan is used for pressurizing the pretreated argon, and the deaerator is used for argon The argon gas is deoxidized so that the oxygen content in the argon gas is less than 5 ppm, and the drying tower is used to further remove the moisture in the argon gas, so that the dew point of the argon gas is lower than -60°C.
进一步地，所述预处理塔、加压风机和干燥塔均为2套并联设置。Further, two sets of the pretreatment tower, the pressurized fan and the drying tower are arranged in parallel.
进一步地，所述预处理塔内设有多层分子筛和/或活性炭。Further, the pretreatment tower is provided with multilayer molecular sieves and/or activated carbon.
进一步地，所述预处理塔的进气口位于底部，出气口位于顶部，并且所述分子筛布置在所述活性碳下方。Further, the air inlet of the pretreatment tower is located at the bottom, the air outlet is located at the top, and the molecular sieve is arranged below the activated carbon.
进一步地，所述加压风机设有回流调节设施，以保证退火炉炉压稳定。Further, the pressurized fan is provided with a backflow adjustment facility to ensure a stable furnace pressure in the annealing furnace.
进一步地，所述除氧器内填充有触媒和脱氧剂。Further, the deaerator is filled with catalyst and deoxidizer.
进一步地，所述干燥塔内填充有多层分子筛，以吸附残余的水和二氧化碳。Further, the drying tower is filled with multilayer molecular sieves to adsorb residual water and carbon dioxide.
本发明采用上述技术方案，具有的有益效果是：采用惰性气体氩气对氢气进行替代，可避免燃爆事故的发生，减少了制氢成本，避免了制氢过程的固废污染；同时对废氩的回收利用显著的降低了氩气消耗，降低带钢生产成本，提高企业竞争力，对钢铁冶金企业冷轧工序节能降耗有着重要的意义。The present invention adopts the above technical scheme, and has the beneficial effects as follows: the use of inert gas argon to replace hydrogen can avoid the occurrence of explosion accidents, reduce the cost of hydrogen production, and avoid the solid waste pollution in the hydrogen production process; The recovery and utilization of argon significantly reduces the consumption of argon gas, reduces the production cost of strip steel, and improves the competitiveness of enterprises.
附图说明Description of drawings
为进一步说明各实施例，本发明提供有附图。这些附图为本发明揭露内容的一部分，其主要用以说明实施例，并可配合说明书的相关描述来解释实施例的运作原理。配合参考这些内容，本领域普通技术人员应能理解其他可能的实施方式以及本发明的优点。图中的组件并未按比例绘制，而类似的组件符号通常用来表示类似的组件。To further illustrate the various embodiments, the present invention is provided with the accompanying drawings. These drawings are a part of the disclosure of the present invention, which are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant description of the specification to explain the operation principles of the embodiments. With reference to these contents, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. Components in the figures are not drawn to scale, and similar component symbols are often used to represent similar components.
图1是本发明的冷轧退火炉保护气供应系统的工艺流程图。FIG. 1 is a process flow diagram of the cold rolling annealing furnace shielding gas supply system of the present invention.
现结合附图和具体实施方式对本发明进一步说明。The present invention will now be further described with reference to the accompanying drawings and specific embodiments.
如图1所示，一种冷轧退火炉保护气供应系统可包括液氩气化装置1和废氩回收循环利用装置2。液氩气化装置1产生的氩气通过第一管路A供应至冷轧退火炉，废氩回收循环利用装置2产生的氩气通过第二管路B供应至冷轧退火炉。即，纯化后的回收氩气和液氩罐气化的氩气两路并联送入退火炉，两路氩气可切换使用。As shown in FIG. 1 , a protective gas supply system for a cold rolling annealing furnace may include a liquid argon gasification device 1 and a waste argon recovery and recycling device 2 . The argon generated by the liquid argon gasification device 1 is supplied to the cold rolling annealing furnace through the first pipeline A, and the argon generated by the waste argon recovery and recycling device 2 is supplied to the cold rolling annealing furnace through the second pipeline B. That is, the purified recycled argon gas and the argon gas vaporized from the liquid argon tank are sent into the annealing furnace in parallel, and the two argon gas can be switched for use.
液氩气化装置1可包括依次管路连接的液氩储罐11、空温式气化器12和调压阀组13。具体地，液氩储罐11的出液管连接至空温式气化器12的入口，空温式气化器12的出口与第一管路A连接，并且调压阀组13安装在第一管路A上。液氩储罐11中的液氩通过空温式气化器气化成氩气，再经过调压阀组13后可直接送至冷轧退火炉，作为带钢生产用保护气。其中，液氩储罐11、空温式气化器12和调压阀组13均为2套并联设置，互为备用，也可同时使用，保证了氩气的持续稳定供应。The liquid argon gasification device 1 may include a liquid argon storage tank 11 , an air temperature gasifier 12 and a pressure regulating valve group 13 which are connected by pipelines in sequence. Specifically, the liquid outlet pipe of the liquid argon storage tank 11 is connected to the inlet of the air temperature type vaporizer 12, the outlet of the air temperature type vaporizer 12 is connected to the first pipeline A, and the pressure regulating valve group 13 is installed in the first pipeline A. on a pipeline A. The liquid argon in the liquid argon storage tank 11 is vaporized into argon gas through the air temperature gasifier, and then directly sent to the cold rolling annealing furnace after passing through the pressure regulating valve group 13 as a protective gas for strip production. Among them, the liquid argon storage tank 11, the air temperature type vaporizer 12 and the pressure regulating valve group 13 are all set in parallel in two sets, which are backup for each other, and can also be used at the same time, ensuring the continuous and stable supply of argon.
液氩储罐11上安装有液位计111，通过液位计111可以了解液氩储罐11内的液氩量，以便于及时补充，确保氩气的持续稳定供应。在一具体实施例中，液氩储罐11的容积为20立方米，2座，可满足200Nm3/h的保护氩气～6天的供应量。优选地，液氩储罐11的外壁包覆有保温层。A liquid level gauge 111 is installed on the liquid argon storage tank 11, and the liquid argon amount in the liquid argon storage tank 11 can be known through the liquid level gauge 111, so as to facilitate timely replenishment and ensure a continuous and stable supply of argon gas. In a specific embodiment, the volume of the liquid argon storage tanks 11 is 20 cubic meters, and there are two liquid argon storage tanks 11, which can satisfy the supply of protective argon gas of 200Nm3/h for ~6 days. Preferably, the outer wall of the liquid argon storage tank 11 is covered with a thermal insulation layer.
随着退火工序的不断进行，炉内氩气的成份、氧含量、露点、杂质粒度都随之改变，会含有少量氧气、氮气、水蒸气、乳化液等杂质，其品质无法作为保护气继续使用。因此，需要通过废氩回收循环利用装置2对其进行纯化处理。With the continuous progress of the annealing process, the composition, oxygen content, dew point and impurity particle size of the argon gas in the furnace will change accordingly. It will contain a small amount of impurities such as oxygen, nitrogen, water vapor, and emulsion, and its quality cannot be used as a protective gas. . Therefore, it needs to be purified by the waste argon recovery and recycling device 2 .
废氩回收循环利用装置2包括通过相应管路依次连接的预处理塔21、加压 风机22、除氧器23和干燥塔24。其中，预处理塔21的进气口与冷轧退火炉的废氩排放管连接。来自冷轧退火炉的废氩先进预处理塔21进行物理吸附。预处理塔21内设有多层分子筛和/或活性炭等吸附剂，对废氩中的乳化液、水分及颗粒等杂质进行脱除。具体地，预处理塔21的进气口位于底部，出气口位于顶部，并且分子筛层布置在活性碳层下方。预处理塔21设有2座，以备再生时切换使用。The waste argon recovery and recycling device 2 includes a pretreatment tower 21, a pressurizing fan 22, a deaerator 23 and a drying tower 24 connected in sequence through corresponding pipelines. Wherein, the air inlet of the pretreatment tower 21 is connected with the waste argon discharge pipe of the cold rolling annealing furnace. The waste argon advanced pretreatment tower 21 from the cold rolling annealing furnace undergoes physical adsorption. The pretreatment tower 21 is provided with adsorbents such as multilayer molecular sieves and/or activated carbon to remove impurities such as emulsion, moisture and particles in waste argon. Specifically, the air inlet of the pretreatment tower 21 is located at the bottom, the air outlet is located at the top, and the molecular sieve layer is arranged below the activated carbon layer. There are two pretreatment towers 21 for switching use during regeneration.
加压风机22用于将预处理后的氩气进行增压，以补偿氩气经过后续工序所需要的阻力损失。加压风机22设有2台，互为备用，同时设计大回流调节设施221，以防止过度抽取炉内氩气导致炉内压力波动影响带钢生产。加压风机22的功率大小可根据需要进行调节。The pressurizing fan 22 is used to pressurize the pretreated argon gas to compensate for the resistance loss required by the argon gas going through the subsequent process. There are two pressurized fans 22, which are used as backup for each other. At the same time, a large reflux adjustment facility 221 is designed to prevent excessive extraction of argon in the furnace and cause pressure fluctuations in the furnace to affect strip production. The power of the pressurizing fan 22 can be adjusted as required.
除氧器23用于对氩气进行脱氧处理，使氩气中的含氧量小于5ppm。具体地，除氧器23内填充有触媒和脱氧剂。加压后的氩气经过除氧器，在触媒的催化作用下，氩气中的氧气与脱氧剂反应，从而达到去除氧气的作用。在一具体实施例中，除氧器为立式储罐结构，高约2米，直径约0.5米，内装有加热器以满足反应温度，且敷设多层镍铬丝网放置脱氧剂以便脱氧反应能充分进行，同时设有方便装卸的进出料孔。The deaerator 23 is used for deoxidizing the argon, so that the oxygen content in the argon is less than 5 ppm. Specifically, the deaerator 23 is filled with a catalyst and a deoxidizer. The pressurized argon gas passes through the deaerator, and under the catalytic action of the catalyst, the oxygen in the argon gas reacts with the deoxidizer, thereby achieving the effect of removing oxygen. In a specific embodiment, the deaerator is a vertical storage tank structure with a height of about 2 meters and a diameter of about 0.5 meters. A heater is installed inside to meet the reaction temperature, and a multi-layer nickel-chromium wire mesh is laid to place the deoxidizer for the deoxidation reaction. It can be fully carried out, and at the same time, there are inlet and outlet holes for easy loading and unloading.
干燥塔24用于对氩气中的水分进一步脱除。干燥塔24的出气口连接第二管路B。经过干燥塔24之后得到的纯度大于99.999％，露点温度低于-60℃，含氧量小于5ppm的高纯氩气，该高纯氩气通过第二管路B供应至冷轧退火炉。干燥塔24设有2座，以备再生时切换使用。在一具体实施例中，干燥塔为立式储罐结构，高约1米，直径约0.5米，内设多层镍铬丝网放置分子筛填料。The drying tower 24 is used to further remove the moisture in the argon. The air outlet of the drying tower 24 is connected to the second pipeline B. After passing through the drying tower 24, the high-purity argon gas with purity greater than 99.999%, dew point temperature lower than -60°C, and oxygen content less than 5ppm is supplied to the cold rolling annealing furnace through the second pipeline B. Two drying towers 24 are provided for switching use during regeneration. In a specific embodiment, the drying tower is a vertical storage tank structure with a height of about 1 meter and a diameter of about 0.5 meters, and a multi-layer nickel-chromium wire mesh is arranged inside to place molecular sieve packing.
本系统可保证退火炉保护气的持续供应。当废氩回收循环利用装置2无法正常运行时，液氩气化装置1投运；当废氩回收循环利用装置2正常工作时， 液氩气化装置1可补充循环过程中的氩气损耗，同时兼顾调峰稳压作用。This system can ensure the continuous supply of protective gas in the annealing furnace. When the waste argon recovery and recycling device 2 fails to operate normally, the liquid argon gasification device 1 is put into operation; when the waste argon recovery and recycling device 2 is in normal operation, the liquid argon gasification device 1 can supplement the argon loss during the cycle, At the same time, it takes into account the role of peak regulation and voltage regulation.
本发明具有较强的实用性，一方面可大幅减少氩气的使用量，降低退火炉运行成本，提高带钢的价格竞争力；另一方面双供应系统可确保稳定供氩，以满足冷轧退火炉连续生产需要。The invention has strong practicability. On the one hand, it can greatly reduce the amount of argon used, reduce the operating cost of the annealing furnace, and improve the price competitiveness of the strip; The annealing furnace is required for continuous production.
尽管结合优选实施方案具体展示和介绍了本发明，但所属领域的技术人员应该明白，在不脱离所附权利要求书所限定的本发明的精神和范围内，在形式上和细节上可以对本发明做出各种变化，均为本发明的保护范围。Although the present invention has been particularly shown and described in connection with preferred embodiments, it will be understood by those skilled in the art that changes in form and detail may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Various changes are made within the protection scope of the present invention.