CN103586295A - Optimization method for hot rolled strip steel laminar cooling pipeline - Google Patents

Abstract

The invention discloses an optimization method for a hot rolled strip steel laminar cooling pipeline. According to the technical scheme, the corresponding relation between the ratio of the laminar flow upper water volume to the laminar flow lower water volume and the lower collecting pipe water column height is determined, a reasonable ratio of the upper collecting pipe opened number to the lower collecting pipe opened number and the corresponding lower collecting pipe water column demarcated height are determined through a model of the ratio of the laminar flow upper water volume to the laminar flow lower water volume, the cooling speeds of the upper surface and the lower surface of strip steel are the same, and the strip problem caused by uneven cooling of the upper surface and the lower surface of the strip steel can be alleviated.

Description

A kind of optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line

Technical field:

What the present invention relates to is a kind of steel rolling technology, especially a kind of optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line.

Background technology:

In the prior art, known technology is to roll with steel the important step that rear cooling control is hot rolling production, to strip processing characteristics, mechanical property, physical property important, laminar flow is cooling is that band steel rolls rear cooling control most common means, is one of visual plant on current hot-rolling line.The cooling operation principle of laminar flow is with a large amount of siphon pipes sucking-off cooling water from water tank, without flowing under pressure condition, be with steel, make belt steel surface cover the cooling water of the optimum thickness of one deck in laminar condition current downflow, cooling water effectively contacts with band steel, has higher cooling effectiveness.

Because upper and lower manifold construction is arranged, the difference of water spray mode, easily there is inhomogeneous cooling in band steel top and bottom, occurs wooden dipper Qu Xianxiang.Band steel upper and lower surface inhomogeneous cooling is that upper and lower surface is cooling asymmetric, and its reason is because the cooling heat transferring coefficient with steel upper and lower surface is different, and the coefficient of heat transfer of upper and lower surface depends on water spray intensity, belt steel temperature and water temperature with steel upper and lower surface.Therefore, want to guarantee the upper and lower cooling symmetry of band steel, must be rationally with the water spray intensity of steel upper and lower surface.The conventional method of the upper and lower mass area ratio adjustment of laminar flow is to rely on experience manually to adjust according to the curved condition of band steel wooden dipper, this adjustment mode is owing to the water yield with steel upper and lower surface not being calculated than process accurate optimization, the easy difference of cooling heat transferring coefficient of upper and lower surface is larger, there is wooden dipper Qu Xianxiang, cause belt plate shape bad, affect product quality, this is the existing weak point of prior art.

Summary of the invention:

Object of the present invention is exactly for the existing deficiency of prior art, and provide a kind of technical scheme of the optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line, the method of this scheme, by the upper and lower mass area ratio model of laminar flow, determine reasonably upper lower collector pipe unlatching number ratio and corresponding lower collector pipe water column calibrated altitude, assurance is identical with the cooling velocity of steel upper and lower surface, can reduce the plate shape problem of bringing due to upper and lower surface inhomogeneous cooling with steel.

This programme is achieved by the following technical measures: a kind of optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line, is characterized in that comprising the steps:

1) measure and record the diameter d of laminar flow upper header nozzle _u, laminar flow upper header is to the distance h of upper surface of steel plate _u, laminar flow lower collector pipe nozzle diameter d _d, laminar flow lower collector pipe is to the distance h of lower surface of steel plate _d;

2) gather laminar flow upper header flow q _u, lower collector pipe nozzle water velocity compares k on laminar flow;

3) according to formula $r={\left(\frac{{\mathrm{\πd}}_d^2}{{4\mathrm{kq}}_u}\right)}^2\·[{\left(\frac{{4q}_u}{{\mathrm{\πd}}_u^2}\right)}^2+{2\mathrm{gh}}_u+{3\mathrm{gh}}_d{k}^2]$ Obtain the upper and lower collector water yield of laminar flow than r, π wherein, g is constant;

4) according to formula obtain laminar flow lower collector pipe water-column H, measure actual laminar flow lower collector pipe water-column H ₁, compare H and H ₁, if the same enter step 5), if difference is adjusted laminar flow lower collector pipe water-column H ₁, then repeating step 2);

5), according to the width of steel plate with need cooling length, set lower collector pipe on many group laminar flows and carries out cooling to steel plate.

In described step 4), by adjusting the water velocity of laminar flow lower collector pipe, realize adjustment laminar flow lower collector pipe water-column H ₁.

The beneficial effect of this programme can be learnt according to the narration to such scheme, owing to having determined the corresponding relation of the upper and lower mass area ratio of laminar flow and lower collector pipe water-column in this scheme, utilize this relation can obtain upper lower collector pipe cooling velocity when identical in conjunction with actual lower collector pipe water-column, corresponding upper lower collector pipe open number than and lower collector pipe water-column.

As can be seen here, the present invention compared with prior art, has outstanding substantive distinguishing features and significant progressive, and the beneficial effect of its enforcement is also apparent.

The specific embodiment:

For clearly demonstrating the technical characterstic of this programme, below by a specific embodiment, this programme is set forth.

The optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line of this programme, is characterized in that comprising the steps:

1) measure and record the diameter d of laminar flow upper header nozzle _u, laminar flow upper header is to the distance h of upper surface of steel plate _u, laminar flow lower collector pipe nozzle diameter d _d, laminar flow lower collector pipe is to the distance h of lower surface of steel plate _d;

2) gather laminar flow upper header flow q _u, lower collector pipe nozzle water velocity compares k on laminar flow;

3) according to formula $r={\left(\frac{{\mathrm{\πd}}_d^2}{{4\mathrm{kq}}_u}\right)}^2\·[{\left(\frac{{4q}_u}{{\mathrm{\πd}}_u^2}\right)}^2+{2\mathrm{gh}}_u+{3\mathrm{gh}}_d{k}^2]$ Obtain the upper and lower collector water yield of laminar flow than r, π wherein, g is constant;

4) according to formula

obtain laminar flow lower collector pipe water-column H, measure actual laminar flow lower collector pipe water-column H ₁, compare H and H ₁, if the same enter step 5), if difference is adjusted laminar flow lower collector pipe water-column H ₁, then repeating step 2);

5), according to the width of steel plate with need cooling length, set lower collector pipe on many group laminar flows and carries out cooling to steel plate.

In described step 4), by adjusting laminar flow lower collector pipe water velocity, realize adjustment laminar flow lower collector pipe water-column H ₁.

The present invention is not limited in the above-mentioned specific embodiment, and the variation that those of ordinary skills make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.

Claims (2)

1. for an optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line, it is characterized in that comprising the steps:

1) measure and record the diameter d of laminar flow upper header nozzle _u, laminar flow upper header is to the distance h of upper surface of steel plate _u, laminar flow lower collector pipe nozzle diameter d _d, laminar flow lower collector pipe is to the distance h of lower surface of steel plate _d;

2) gather laminar flow upper header flow q _u, lower collector pipe nozzle water velocity compares k on laminar flow;

3) according to formula $r={\left(\frac{{\mathrm{\πd}}_d^2}{{4\mathrm{kq}}_u}\right)}^2\·[{\left(\frac{{4q}_u}{{\mathrm{\πd}}_u^2}\right)}^2+{2\mathrm{gh}}_u+{3\mathrm{gh}}_d{k}^2]$ Obtain the upper and lower collector water yield of laminar flow than r, π wherein, g is constant;

4) according to formula obtain laminar flow lower collector pipe water-column H, measure actual laminar flow lower collector pipe water-column H ₁, compare H and H ₁, if the same enter step 5), if difference is adjusted laminar flow lower collector pipe water-column H ₁, then repeating step 2);

5), according to the width of steel plate with need cooling length, set lower collector pipe on many group laminar flows and carries out cooling to steel plate.

2. the optimization method for TEMPERATURE FOR HOT STRIP LAMINAR cooling line according to claim 1, is characterized in that: in described step 4), by adjusting the water velocity of laminar flow lower collector pipe, realize adjustment laminar flow lower collector pipe water-column H ₁.