CN110576160A - A control system and method for continuous casting machine crystallizer water - Google Patents
A control system and method for continuous casting machine crystallizer water Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 238000009749 continuous casting Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 23
- 239000010949 copper Substances 0.000 claims abstract description 23
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 235000006506 Brasenia schreberi Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
技术领域technical field
本发明属于冶金技术领域，涉及一种连铸机结晶器水的控制系统及方法。The invention belongs to the technical field of metallurgy, and relates to a control system and method for crystallizer water of a continuous casting machine.
背景技术Background technique
随着我国经济由高速增长阶段转向高质量发展阶，对企业的生产效率提升提出了更高的要求，在钢铁工业领域，从原料到成品一般经历四个大的工序，分别是高炉炼铁，转炉炼钢，连铸成坯，轧钢成材，目前，“连铸成坯”是实现高效率的限制性工序，因此，提高连铸效率成为了提高钢铁工业生产效率的关键。As my country's economy shifts from a stage of high-speed growth to a stage of high-quality development, higher requirements are placed on the improvement of production efficiency of enterprises. In the field of iron and steel industry, there are generally four major processes from raw materials to finished products, namely, blast furnace ironmaking, Converter steelmaking, continuous casting into slabs, and rolling into products. At present, "continuous casting into slabs" is a restrictive process to achieve high efficiency. Therefore, improving continuous casting efficiency has become the key to improving production efficiency in the iron and steel industry.
连铸是以将液态钢水为主要原料，通过结晶器、导向辊、二次冷却等工艺环节，如图1所示，将液态钢水转换为具有特定形状的固态铸坯的过程，在钢铁工业生产的工序中，连铸工序是连接炼钢和轧钢的中间环节，起到承上启下的作用。Continuous casting is the process of converting liquid steel into a solid billet with a specific shape through crystallizers, guide rollers, secondary cooling and other process links as the main raw material, as shown in Figure 1. It is produced in the iron and steel industry. Among the processes, the continuous casting process is the intermediate link connecting steelmaking and steel rolling, and plays a role of linking the preceding and the following.
之所以提高连铸工序拉速难以实现的最大原因是，在高拉速下，结晶器区域漏钢事故发生的概率大大提高，造成巨大的经济损失。而漏钢率提高的原因有2个方面：1)内因---高拉速下结晶器内铸坯停留时短，坯壳较薄，温度较高，导致抗拉强度较低；2)外因-高拉速下，坯壳与结晶器间的摩擦力增大。The biggest reason why it is difficult to increase the casting speed of the continuous casting process is that at high casting speeds, the probability of steel breakout accidents in the mold area is greatly increased, resulting in huge economic losses. There are two reasons for the increase in the breakout rate: 1) internal factors---the residence time of the slab in the mold is short at high casting speeds, the slab shell is thinner, and the temperature is higher, resulting in lower tensile strength; 2) external factors - At high pulling speeds, the friction between the shell and the mold increases.
为了解决上述问题，达涅利里卡多·托尼等提出一种高效连铸结晶器(专利名称：一种高效连铸结晶器专利号：201420063767.4)所述结晶器铜管内表面冲压有多条条形凹槽。以实现高拉速浇注和高的铸坯无缺陷率。同时,极大的提高了铜管的使用寿命。中冶连铸李富帅等提出新型结晶器铜管(专利名称：一种梅花型结晶器铜管，专利号：201520168790.4)，该结晶器铜管上部曲面横截面呈凸形,中部曲面截面为矩形,下部曲面截面为四角凸起的矩形,使其坯壳表面温度沿截面周长方向更加均匀,实现了更高拉坯速度的目的。In order to solve the above problems, Danieli Ricardo Tony and others proposed a high-efficiency continuous casting mold (patent name: a high-efficiency continuous casting mold patent number: 201420063767.4). The inner surface of the copper tube of the mold is stamped with multiple lines Bar groove. In order to achieve high-speed casting and high defect-free slab. At the same time, the service life of the copper tube is greatly improved. China Metallurgical Continuous Casting Li Fushuai and others proposed a new mold copper tube (patent name: a plum-shaped mold copper tube, patent number: 201520168790.4). The upper curved surface of the mold copper tube is convex in cross section, and the middle curved surface is rectangular in cross section. The cross-section of the lower curved surface is a rectangle with four protruding corners, so that the surface temperature of the billet shell is more uniform along the perimeter of the cross-section, and the purpose of higher billet casting speed is realized.
上述方案，为了提高拉速，优化结晶器结构，导致结晶器的结构变得复杂，所需加工和维护成本较高。In the above solution, in order to increase the casting speed and optimize the structure of the crystallizer, the structure of the crystallizer becomes complicated, and the required processing and maintenance costs are relatively high.
发明内容Contents of the invention
有鉴于此，本发明的目的在于提供一种连铸机结晶器水的控制系统及方法，通过改变结晶器水在结晶器水缝内的流动形式，即从层流方式变为紊流方式，从而减少或消除结晶器冷却水在结晶器铜板面上的附面层，进而降低铜板和结晶器铜板间的热阻，以提升传热效果，提高坯壳在结晶器内的厚度和强度。方法简单，成本低廉，便于维护。In view of this, the object of the present invention is to provide a control system and method for continuous casting machine mold water, by changing the flow form of mold water in the mold water gap, that is, changing from laminar flow mode to turbulent flow mode, Thereby reducing or eliminating the boundary layer of the crystallizer cooling water on the surface of the crystallizer copper plate, thereby reducing the thermal resistance between the copper plate and the mold copper plate, so as to improve the heat transfer effect and increase the thickness and strength of the billet shell in the mold. The method is simple, the cost is low, and the maintenance is convenient.
为达到上述目的，本发明提供如下技术方案：To achieve the above object, the present invention provides the following technical solutions:
一种连铸机结晶器水的控制系统，该系统包括依次连接的用于水量扰动的结晶器水进水系统、结晶器系统和结晶器水出水系统。A continuous casting machine crystallizer water control system, the system includes a mold water inlet system, a crystallizer system and a mold water outlet system connected in sequence for water volume disturbance.
可选的，所述结晶器水进水系统包括结晶器正常状态进水子系统和结晶器应急状态进水子系统。Optionally, the crystallizer water inlet system includes a crystallizer normal state water inlet subsystem and a crystallizer emergency state water inlet subsystem.
可选的，所述结晶器正常状态进水子系统包括用于远程调节的气动调节阀、止回阀和进水管路。Optionally, the water inlet subsystem in the normal state of the crystallizer includes a pneumatic regulating valve for remote adjustment, a check valve and a water inlet pipeline.
可选的，所述结晶器应急状态进水子系统包括止回阀和进水管路。Optionally, the crystallizer emergency state water inlet subsystem includes a check valve and a water inlet pipeline.
可选的，结晶器水进水系统与结晶器系统之间，设置有本地压力表和温度传感器I。Optionally, a local pressure gauge and a temperature sensor I are provided between the crystallizer water inlet system and the crystallizer system.
可选的，所述结晶器系统中，沿着远离结晶器内腔方向，依次设置有结晶器铜板、结晶器水缝、结晶器冷却水和结晶器背板。Optionally, in the crystallizer system, along the direction away from the inner cavity of the crystallizer, a copper plate for the crystallizer, a water gap for the crystallizer, cooling water for the crystallizer and a back plate for the crystallizer are sequentially arranged.
可选的，所述结晶器水缝由结晶器背板和结晶器铜板间隙构成，用于结晶器冷却水同结晶器水缝流过，不断的带走热量。Optionally, the crystallizer water gap is formed by the gap between the crystallizer back plate and the crystallizer copper plate, and is used for the crystallizer cooling water to flow through the crystallizer water gap to continuously take away heat.
可选的，所述结晶器水出水系统包括温度传感器II、流量传感器和出水管路。Optionally, the crystallizer water outlet system includes a temperature sensor II, a flow sensor and an outlet pipeline.
基于所述系统的连铸机结晶器水的控制方法，设定结晶器系统的进水水量目标设定值Qi，包括常规设定水量Qc量和扰动水量Qt，且Qi＝Qc+Qt；Based on the control method of the continuous casting machine crystallizer water of the system, the water intake target setting value Qi of the crystallizer system is set, including the conventional set water quantity Qc and disturbance water quantity Qt, and Qi=Qc+Qt;
扰动水量Qt和常规设定水量Qc相关，且随时间变化；The disturbance water quantity Qt is related to the conventional set water quantity Qc and changes with time;
扰动水量Qt＝Asin(ωt)，A＝αQc其中α取1～10％，ω取π～20π，t为时间单位为s；Disturbance water quantity Q t =Asin(ωt), A=αQ c where α is 1~10%, ω is π~20π, t is the time unit is s;
扰动水量Qt，Disturbed water volume Q t ,
A＝αQc，其中α取1～10％，t1，t2为时间段取值范围为5s～20s，T为周期，ω取π～20π，t为时间单位为s；A=αQ c , where α is 1 to 10%, t 1 and t 2 are the time period, the value range is 5s to 20s, T is the cycle, ω is π to 20π, and t is the time unit in s;
带有扰动量的结晶器在设定水量时，通过流量调节阀直接动态调节实现或通过单独设置扰动水量水路实现。When setting the water volume of the crystallizer with disturbance volume, it can be realized through the direct dynamic adjustment of the flow regulating valve or by setting the disturbance water volume waterway separately.
可选的，所述温度传感器I将测量结晶器冷却水的温度传输到可编程逻辑控制器PLC，并进行高温报警，当冷却水进水水温高于一定温度时，则将发送报警信号到PLC；Optionally, the temperature sensor 1 transmits the temperature of the crystallizer cooling water to the programmable logic controller PLC, and performs a high temperature alarm. When the cooling water inlet water temperature is higher than a certain temperature, an alarm signal will be sent to the PLC ;
温度传感器II将测量温度远程传输到PLC系统，并进行温差报警，当结晶器水出水系统的水温To与结晶器水进水系统的水温Ti温差To-Ti大于一定值时，将报警信号传递到PLC系统；The temperature sensor II transmits the measured temperature to the PLC system remotely, and performs a temperature difference alarm. When the temperature difference To-Ti between the water temperature To of the crystallizer water outlet system and the water temperature Ti of the crystallizer water inlet system is greater than a certain value, the alarm signal is transmitted to PLC system;
流量传感器将流量信号传输到PLC系统，当流量大于设定值超过一定限度时，将流量高报警信号传输到PLC系统；或者当流量低于设定值一定限度时，将流量低报警信号传输到PLC系统。The flow sensor transmits the flow signal to the PLC system. When the flow is greater than the set value and exceeds a certain limit, the high flow alarm signal is transmitted to the PLC system; or when the flow is lower than the set value by a certain limit, the low flow alarm signal is transmitted to the PLC system. PLC system.
本发明的有益效果在于：对结晶器水进水系统进行简单的修改或动态调节结晶器水进水系统的流量调节阀即可实现减小结晶器水与结晶器铜板间的冷却水附面层的作用，从而减小了两者间的热阻，进而达到提高传热效率的目的。The beneficial effect of the present invention is that the cooling water boundary layer between the crystallizer water and the crystallizer copper plate can be reduced by simply modifying the crystallizer water inlet system or dynamically adjusting the flow regulating valve of the crystallizer water inlet system The effect of reducing the thermal resistance between the two, thereby achieving the purpose of improving heat transfer efficiency.
本发明的其他优点、目标和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书来实现和获得。Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from It is taught in the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.
附图说明Description of drawings
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作优选的详细描述，其中：In order to make the purpose of the present invention, technical solutions and advantages clearer, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:
图1为连铸机示意图；Fig. 1 is a schematic diagram of a continuous casting machine;
图2为结晶器冷却系统示意图；Fig. 2 is the schematic diagram of crystallizer cooling system;
图3为结晶器示意图。Figure 3 is a schematic diagram of the crystallizer.
附图标记：结晶器水进水系统1、结晶器系统2、结晶器水出水系统3、气动调节阀101、止回阀102、结晶器应急状态进水子系统103、温度传感器104、本地压力表105、液态钢水201、结晶器铜板202、结晶器水缝203、结晶器背板204、凝固坯壳205、温度传感器301、流量传感器302、结晶器回水管路303。Reference signs: crystallizer water inlet system 1, crystallizer system 2, mold water outlet system 3, pneumatic control valve 101, check valve 102, crystallizer emergency state water inlet subsystem 103, temperature sensor 104, local pressure Table 105, molten steel 201, mold copper plate 202, mold water seam 203, mold back plate 204, solidified billet shell 205, temperature sensor 301, flow sensor 302, mold return water pipeline 303.
具体实施方式Detailed ways
以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。需要说明的是，以下实施例中所提供的图示仅以示意方式说明本发明的基本构想，在不冲突的情况下，以下实施例及实施例中的特征可以相互组合。Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.
其中，附图仅用于示例性说明，表示的仅是示意图，而非实物图，不能理解为对本发明的限制；为了更好地说明本发明的实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.
本发明实施例的附图中相同或相似的标号对应相同或相似的部件；在本发明的描述中，需要理解的是，若有术语“上”、“下”、“左”、“右”、“前”、“后”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此附图中描述位置关系的用语仅用于示例性说明，不能理解为对本发明的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices or elements must It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are only for illustrative purposes, and should not be construed as limitations on the present invention. For those of ordinary skill in the art, the understanding of the specific meaning of the above terms.
请参阅图1-图3，附图中的元件标号分别表示：具有水量扰动功能的结晶器水进水系统1、结晶器系统2、结晶器水出水系统3、气动调节阀101、止回阀102、结晶器应急状态进水子系统103、温度传感器104、本地压力表105、液态钢水201、结晶器铜板202、结晶器水缝203、结晶器背板204、凝固坯壳205、温度传感器301、流量传感器302、结晶器回水管路303。Please refer to Fig. 1-Fig. 3, the component numbers in the accompanying drawings represent respectively: mold water inlet system 1 with water disturbance function, crystallizer system 2, mold water outlet system 3, pneumatic regulating valve 101, check valve 102. Mold emergency state water inlet subsystem 103, temperature sensor 104, local pressure gauge 105, liquid steel 201, mold copper plate 202, mold water seam 203, mold back plate 204, solidified billet shell 205, temperature sensor 301 , flow sensor 302, crystallizer return water pipeline 303.
本发明适用连铸工艺过程，一种连铸机结晶器水的控制系统及方法，包括具有水量扰动功能的结晶器水进水系统、结晶器系统和结晶器水出水系统。The invention is applicable to the continuous casting process, and provides a control system and method for the crystallizer water of the continuous casting machine, including a crystallizer water inlet system, a crystallizer system and a crystallizer water outlet system with the function of disturbing the water volume.
一种具有水量扰动功能的结晶器水进水系统包括结晶器正常状态进水子系统和结晶器应急状态进水子系统。A crystallizer water intake system with the function of water volume disturbance includes a crystallizer normal state water intake subsystem and a crystallizer emergency state water intake subsystem.
可选地，结晶器正常状态进水子系统包括可以远程调节的气动调节阀、止回阀和进水管路。Optionally, the water inlet subsystem in the normal state of the crystallizer includes a pneumatic regulating valve, a check valve and a water inlet pipeline that can be adjusted remotely.
可选地，流量调节阀具有远程调节的功能，即通过电信号调节阀门开度的功能。Optionally, the flow regulating valve has the function of remote regulation, that is, the function of regulating the opening of the valve through an electric signal.
可选地，结晶器进水水量目标设定值Qi包括常规设定水量Qc＝400L/min量和扰动水量Qt＝20sin(1.5t)，且Qi＝Qc+Qt。Optionally, the crystallizer inlet water target setting value Qi includes a conventional set water quantity Qc=400L/min and a disturbance water quantity Qt=20sin(1.5t), and Qi=Qc+Qt.
可选地，带有扰动量的结晶器设定水量可以通过流量调节阀直接动态调节实现，也可单独设置扰动水量水路实现。Optionally, the set water volume of the crystallizer with disturbance can be directly and dynamically adjusted through the flow regulating valve, or can be realized by separately setting the disturbance water volume waterway.
可选地，结晶器应急状态进水子系统包括止回阀和进水管路。Optionally, the crystallizer emergency state water inlet subsystem includes a check valve and a water inlet pipeline.
可选地，在结晶器水进水系统管路接入结晶器前，安装本地压力表以及温度传感器。Optionally, install a local pressure gauge and temperature sensor before the crystallizer water inlet system pipe is connected to the crystallizer.
可选地，温度传感器具有将测量的结晶器冷却水温度传输到PLC(可编程逻辑控制器)的功能，且具有高温报警功能，当冷却水进水水温高于一定温度时，如40℃，则将发送报警信号到PLC。Optionally, the temperature sensor has the function of transmitting the measured crystallizer cooling water temperature to PLC (programmable logic controller), and has a high temperature alarm function. When the cooling water inlet water temperature is higher than a certain temperature, such as 40 ° C, Then an alarm signal will be sent to PLC.
一种结晶器系统，在沿着远离结晶器内腔方向，依次设置结晶器铜板、结晶器水缝、结晶器冷却水以及结晶器背板。A crystallizer system, along the direction away from the inner cavity of the crystallizer, the copper plate of the crystallizer, the water gap of the crystallizer, the cooling water of the crystallizer and the back plate of the crystallizer are sequentially arranged.
可选地，结晶器水缝由结晶器背板和结晶器铜板间隙构成，结晶器冷却水同结晶器水缝流过，不断的带走热量。Optionally, the crystallizer water gap is formed by the gap between the crystallizer back plate and the crystallizer copper plate, and the crystallizer cooling water flows through the crystallizer water gap to continuously take away heat.
一种结晶器水出水系统包括温度传感器和流量传感器以及出水管路。A crystallizer water outlet system includes a temperature sensor, a flow sensor and a water outlet pipeline.
可选地，温度传感器有将测量温度远程传输到PLC系统的功能，且温度传感器具有温差报警功能，当结晶器水出水系统的水温To与结晶器水进水系统的水温Ti温差To-Ti大于一定值时，如10℃，将报警信号传递到PLC系统的功能。Optionally, the temperature sensor has the function of remotely transmitting the measured temperature to the PLC system, and the temperature sensor has a temperature difference alarm function. When the temperature difference To-Ti between the water temperature To of the crystallizer water outlet system and the water temperature Ti of the crystallizer water inlet system is greater than When a certain value, such as 10 ℃, the function of transmitting the alarm signal to the PLC system.
可选地，流量传感器有具有将流量信号传输到PLC系统的功能，且流量传感器具有流量大于设定值超过一定限度时，如超过设定值的110％，将流量高报警信号传输到PLC系统的功能。或者低于设定值一定限度时，如低于设定值的90％，将流量低报警信号传输到PLC系统的功能。Optionally, the flow sensor has the function of transmitting the flow signal to the PLC system, and the flow sensor has the function of transmitting the high flow alarm signal to the PLC system when the flow rate exceeds a certain limit, such as exceeding 110% of the set value. function. Or when the set value is lower than a certain limit, such as lower than 90% of the set value, the function of transmitting the low flow alarm signal to the PLC system.
本发明的工作原理：通过改变结晶器水在结晶器水缝内的流动形式，即从层流方式变为紊流方式，从而减少或消除结晶器冷却水在结晶器铜板面上的附面层，进而降低铜板和结晶器铜板间的热阻，以提升传热效果，提高坯壳在结晶器内的厚度和强度。The working principle of the present invention is to reduce or eliminate the boundary layer of the crystallizer cooling water on the copper plate surface of the crystallizer by changing the flow form of the crystallizer water in the crystallizer water gap, that is, from the laminar flow mode to the turbulent flow mode , and then reduce the thermal resistance between the copper plate and the crystallizer copper plate to improve the heat transfer effect and increase the thickness and strength of the billet shell in the mold.
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例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，可以对本发明的技术方案进行修改或者等同替换，而不脱离本技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should be included in the scope of the claims of the present invention.
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