A flow control method for hot-rolled strip coiling temperature

Abstract

The invention provides a flow control method for the rolling temperature of a hot rolled steel strip and belongs to the technical field of rolled steel automatic control. The method comprises: reading plate blank PDI data, equipment parameters and rolling temperature model parameters, and extracting the actual measurement values of pyrometers when the steel strip reaches a finish rolling inlet and a finish rolling outlet; determining the given configuration and flow of the material specification of beginning valve and headers; according to the given flow and the rolling temperature model of each group of headers, determining the convective heat transfer coefficient of each group of headers; according to the rolling temperature model, calculating total flow required by cooling from the finish rolling outlet to a rolling inlet; determining total valve opening number required by cooling, and sending the set configuration to a level I basic automation executor; and carrying out feedback calculation according to the actual rolling temperature, regulating the opening and closing state of headers in a fine tuning zone, and ensuring a target rolling temperature. The method can stably control the rolling temperature index, ensure that the first block of an another specification of strip steel and a thick specification of strip steel can stably pass, improve the rolling temperature hit rate and improve the quality performance of a product.

Description

technical field

[0001] The invention relates to a flow control method for coiling temperature of hot-rolled strip steel, which belongs to the technical field of automatic control of steel rolling. Background technique

[0002] The coiling temperature is an important process parameter that affects the microstructure and properties of the strip, and is also an important index in the production control of hot rolling. In the production of hot-rolled strip steel, the control of the coiling temperature mainly depends on the timely opening and closing adjustment of the configuration of the laminar flow cooling header group. Precision control. Generally, each group of master valves in the laminar flow cooling equipment area is a pneumatic on-off valve. The control of the valve opening and flow is manually adjusted during commissioning or maintenance, and the flow of each group of valves is adjusted to be roughly equal. The setting of the flow cooling model is carried out under th...

Examples

Embodiment

[0041] The present invention takes a certain medium and wide band 950 hot rolling production line as an example, combining figure 2 To be explained as follows:

[0042] Step 1. Read the slab PDI data. The slab number is YG151004366, the steel type is 08AL, the slab specification is 165*770*10000mm, the product target thickness is 3.0mm, the final rolling target temperature is 865°C, and the coiling target temperature is 550 °C, read equipment constants and parameters related to the coiling temperature model. The measured value of the pyrometer at the entrance of the slab before reaching the finishing mill is 988°C, and the measured value of the pyrometer at the exit of the finishing mill is 851°C; there are 15 sets of headers in the interlayer cooling zone, Each of the first 13 groups has 4 cooling units, and each of the latter two groups has 8 cooling units, and each group of headers is equipped with a flow meter, which can better test the flow given control method of the pr...

technical field

[0001] The invention relates to a flow control method for coiling temperature of hot-rolled strip steel, which belongs to the technical field of automatic control of steel rolling. Background technique

[0002] The coiling temperature is an important process parameter that affects the microstructure and properties of the strip, and is also an important index in the production control of hot rolling. In the production of hot-rolled strip steel, the control of the coiling temperature mainly depends on the timely opening and closing adjustment of the configuration of the laminar flow cooling header group. Precision control. Generally, each group of master valves in the laminar flow cooling equipment area is a pneumatic on-off valve. The control of the valve opening and flow is manually adjusted during commissioning or maintenance, and the flow of each group of valves is adjusted to be roughly equal. The setting of the flow cooling model is carried out under th...

Examples

Embodiment

[0041] The present invention takes a certain medium and wide band 950 hot rolling production line as an example, combining figure 2 To be explained as follows:

[0042] Step 1. Read the slab PDI data. The slab number is YG151004366, the steel type is 08AL, the slab specification is 165*770*10000mm, the product target thickness is 3.0mm, the final rolling target temperature is 865°C, and the coiling target temperature is 550 °C, read equipment constants and parameters related to the coiling temperature model. The measured value of the pyrometer at the entrance of the slab before reaching the finishing mill is 988°C, and the measured value of the pyrometer at the exit of the finishing mill is 851°C; there are 15 sets of headers in the interlayer cooling zone, Each of the first 13 groups has 4 cooling units, and each of the latter two groups has 8 cooling units, and each group of headers is equipped with a flow meter, which can better test the flow given control method of the pr...

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