CN1601257A - Method for estimating and measuring zinc ratio in time after dezincification of mud toroidal swirl of blast furnace gas - Google Patents

Abstract

The invention discloses a real-time estimation method of zinc content in blast-furnace gas mud after which is dezinced by means of swirling flow, and is aimed at providing a test and regulation method capable of real-time monitoring zinc content of bottom flow blast-furnace gas mud and in-plant reuse rate. Said method is formed from the following three steps: firstly, using lase granulometer to measure granular grain-size distribution, specially granular grain-size distribution of bottom flow of swirler, and using a devie which uses flow mixer as main body and can automatically measure and control the light-screening rate OB value of laser glanurometer to implement real-time on-line measurement of laser granulometer; then according to granular measurement result, using a formula to estimate zinc content; and finally regulating condition of swirler so as to regulate the characteristics of bottom flow gas mud of swirler.

Description

Contain the real-time estimating and measuring method of zinc rate after the dezincify of blast furnace gas mud eddy flow

Technical field

The present invention relates to the quick estimating and measuring method of a kind of composition in steel plant's blast furnace gas mud processing procedure, more particularly, it contains the real-time estimating and measuring method of zinc rate after relating to the dezincify of a kind of blast furnace gas mud eddy flow.

Background technology

In the blast furnace ironmaking process, produce the trickle stove dirt of a large amount of iron content, carbon, after processes such as control of dust, washing, can form gas mud.This gas mud is good iron-smelting raw material, but owing to the content of zinc in the gas mud is higher, direct reuse can influence the serviceable life of blast furnace.For excavating its potential economic benefit and avoiding causing serious environmental to pollute because of throwing aside gas mud, over nearly one, 20 year, developed the new technology of some blast furnace gas mud dezincify reuses both at home and abroad, wherein to have technology simple because of it for hydraulic cyclone method, and equipment investment is few, and is easy to implement, easy to maintenance, operating cost is low, and characteristics such as non-secondary pollution have been subjected to common concern.This method is carried out wet classification to the particle in the blast furnace gas mud by particle diameter, thereby gas mud is separated into contains fine grain high zinc mud (be called top stream) and contain coarse grained low zinc mud (being called underflow), the former sends place such as cement mill outside and utilizes after dehydration, the latter as the raw material of ironmaking, reaches the purpose of discarded object decrement and resource behind dehydration, sintering.This method is on the ironmaking streamline during actual operation, because component, concentration, the flow of supplied materials may often change, can influence the separating effect of hydrocyclone, need the working condition of hydrocyclone is monitored in real time for this reason, reclamation rate in the factory that contains zinc rate and gas mud of control underflow, its controlled target at first will satisfy the low requirement that contains the zinc rate of charging of shaft furnace, guarantees blast furnace safety, and it is less important to make that reclamation rate reaches to greatest extent in the gas mud factory.Present directly mensuration contains the zinc rate and is difficult to accomplish real-time online, off-line measurement after generally employing is taken a sample, and the time that needs is long, has directly influenced the security of operation of blast furnace.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can monitor hydraulic cyclone method blast furnace gas mud dezincify reuse technology process in real time, improve the operation of blast furnace security, reach reclamation rate in the maximum gas mud factory, contain the real-time estimating and measuring method of zinc rate after the blast furnace gas mud eddy flow dezincify that reduces production costs.

Technical scheme of the present invention is: contain the real-time estimating and measuring method of zinc rate after the dezincify of a kind of blast furnace gas mud eddy flow, be characterized in, entire method is made up of following step:

The first step: with a kind of mixed flow device of may command gas mud concentration and automatic measurement and control device of laser particle sizer of comprising, adjust suitable shading rate, the particle size distribution of real-time online measuring cyclone underflow is calculated eigenwert Pv ₁₀* D ₃₂, Pv ₁₀Be the percent by volume less than particle below 10 microns, D ₃₂Be the Suo Taier diameter;

Sampling and measuring shading rate OB value at first, the OB value of hypothesis testing state has a upper and lower bound, if initial OB value, is then driven big mixed flow device water valve greater than the upper limit, increases inflow, otherwise then turns down water valve, reduces inflow; When the OB value is suitable, gather distribution of particles information automatically.When water valve closes to minimum value (but can not can not stop for zero), the OB value still less than lower limit and constantly decline, then stops to gather, and carries out statistical computation, exports the result, continues monitoring OB value simultaneously until the satisfied condition that enters next measuring period;

Second step: according to underflow particle sizing result, estimation contains the zinc rate;

The variation of steel plant's iron-smelting raw material proportioning can change the characteristic of gas mud, promptly gas mud in each particle diameter segmentation volume (or weight) number percent and contain the zinc rate and the iron content rate, but be metastable in period.Therefore unalterable estimation equation can not be arranged, steel plant have regular off-line to contain zinc rate measured data.A large amount of studies show that, for underflow, and eigenwert Pv ₁₀* D ₃₂, zinc rate Hzn is relevant with containing, so contain the available following formula estimation of zinc rate:

Hzn＝a(Pv ₁₀×D ₃₂) ³+b(Pv ₁₀×D ₃₂) ²+c(Pv ₁₀×D ₃₂)+d

Wherein a, b, c, d value contain zinc rate Hzn and underflow eigenwert Pv by the underflow of actual measurement ₁₀* D ₃₂Historical data return and to obtain, historical data was only got nearest 2 months.

The 3rd step: regulate reuse gas mud characteristic;

If the estimation of hydrocyclone underflow gas mud contains the zinc rate less than setting value, the underflow gas mud can enter blast furnace; Otherwise regulate the duty parameter of hydrocyclone automatically, make the ratio of underflow small particles descend, till reaching the standard that can enter blast furnace; On the contrary, if the estimation of this part mud contains the zinc rate well below established standards, then can suitably improve reclamation rate in the gas mud factory.

The invention has the beneficial effects as follows:

The present invention is by the process of the reuse technology of monitoring hydraulic cyclone method blast furnace gas mud dezincify in real time, and the security that has improved operation of blast furnace prolongs the serviceable life of blast furnace, and improves reclamation rate in the factory of gas mud to greatest extent, thereby reduces production costs.

Description of drawings

Fig. 1 is an automatic measurement and control shading rate schematic representation of apparatus;

Fig. 2 is for containing the flow chart of the real-time estimating and measuring method of zinc rate after the dezincify of blast furnace gas mud eddy flow.

Embodiment

The invention will be further described below in conjunction with accompanying drawing 1,2.

Contain the real-time estimating and measuring method of zinc rate after the dezincify of a kind of blast furnace gas mud eddy flow, be characterized in, entire method is made up of following step:

The first step: with a kind of mixed flow device of may command gas mud concentration and automatic measurement and control device of laser particle sizer of comprising, adjust suitable shading rate, the particle size distribution of real-time online measuring cyclone underflow is calculated eigenwert Pv ₁₀* D ₃₂, Pv ₁₀Be the percent by volume less than particle below 10 microns, D ₃₂Be the Suo Taier diameter;

Sampling and measuring shading rate OB value at first, the OB value of hypothesis testing state has a upper and lower bound, if initial OB value, is then driven big mixed flow device water valve greater than the upper limit, increases inflow; Otherwise then turn down water valve, reduce inflow.When the OB value is suitable, gather distribution of particles information automatically.When water valve closes to minimum value (but can not can not stop for zero), the OB value still less than lower limit and constantly decline, then stops to gather, and carries out statistical computation, exports the result, continues monitoring OB value simultaneously until the satisfied condition that enters next measuring period;

Second step: according to underflow particle sizing result, estimation contains the zinc rate;

Contain the available following formula estimation of zinc rate:

Hzn＝a(Pv ₁₀×D ₃₂) ³+b(Pv ₁₀×D ₃₂) ²+c(Pv ₁₀×D ₃₂)+d

Wherein a, b, c, d value contain zinc rate Hzn and underflow eigenwert Pv by the underflow of actual measurement ₁₀* D ₃₂Historical data return and to obtain, historical data was only got nearest 2 months.

The 3rd step: regulate reuse gas mud characteristic;

If the estimation of hydrocyclone underflow gas mud contains the zinc rate less than setting value, the underflow gas mud can enter blast furnace; Otherwise regulate the duty parameter of hydrocyclone automatically, make the ratio of underflow small particles descend, till reaching the standard that can enter blast furnace; On the contrary, if the estimation of this part mud contains the zinc rate well below established standards, then can suitably improve reclamation rate in the gas mud factory.

Enforcement of the present invention:

Because have correlationship containing between zinc rate and the particle size distribution of blast furnace gas mud, promptly zinc mainly is present in the granule, by means of containing the zinc rate by the real-time online measuring particle size distribution to reach indirect estimation.Experiment showed, in the underflow gas mud volume share Pv less than 10 μ m particles ₁₀With Suo Taier diameter D ₃₂Product with contain zinc rate Hzn and have preferably, therefore available Pv ₁₀* D ₃₂Estimation contains the zinc rate as eigenwert.

The present invention is when work, as shown in Figure 1, the gas mud that blast furnace produces enters hydrocyclone 2 by entrance point 1, be provided with the sample valve 4 and 5 of threeway 3 and two interlocks in the cyclone separator underflow pipeline, between " the normal conveying " and " sampling " two states, switch, when entering the sampling state, take a sample within a certain period of time.After adjuster 6 dispersions, further dilute through three way type mixed flow device 7 again, measure shading rate OB values by laser particle sizer 8 and (use shading rate OB=1-I/I usually ₀The index of concentration control during as measurement, the OB value of hypothesis testing state has a upper and lower bound scope), if initial OB value greater than the upper limit, is then driven big water valve 9, increase inflow, otherwise then turn down water valve, reduce inflow.Laser particle sizer is gathered distribution of particles information automatically when the OB value is suitable.Close to minimum value (but can not promptly can not stop for zero) as water valve 7, the OB value still less than lower limit and constantly decline, then stops to gather, this cycle of explanation closes to an end, carry out statistical computation, the output result continues monitoring OB value simultaneously until satisfying the condition that enters next measuring period.According to the particle sizing result, estimation contains zinc rate Hzn=a (Pv ₁₀* D ₃₂) ³+ b (Pv ₁₀* D ₃₂) ²+ c (Pv ₁₀* D ₃₂)+d, wherein a, b, c, d value contain zinc rate Hzn and underflow eigenwert Pv by the underflow of actual measurement ₁₀* D ₃₂Historical data return and to obtain, historical data was only got nearest 2 months, thus can revise the relational expression that estimation contains the zinc rate at any time, to adapt to the influence of incoming flow component variation.Relatively estimation contains zinc rate and setting value, and underflow gas mud characteristic is carried out regulating and controlling, if the estimation of hydrocyclone underflow gas mud contains the zinc rate less than setting value, then this part mud just can enter blast furnace as fine ore after treatment; Otherwise regulate the duty parameter of hydrocyclone automatically, and reduce reclamation rate in the factory, strengthen separating effect, make the ratio decline of underflow small particles, till reaching the standard that can enter blast furnace; On the contrary, if the estimation of this part mud contains the zinc rate well below established standards, then can suitably improve reclamation rate in the gas mud factory.

Claims (1)

1. contain the real-time estimating and measuring method of zinc rate after the blast furnace gas mud eddy flow dezincify, it is characterized in that entire method is made up of following step:

The first step: but realize laser particle sizer real-time online measuring particle size distribution, the particularly particle size distribution of cyclone underflow with a kind of device of shading rate OB value of the automatic measuring and controlling laser particle sizer based on the mixed flow device;

Sampling and measuring shading rate OB value at first, the OB value of hypothesis testing state has a upper and lower bound, if initial OB value, is then driven big mixed flow device water valve greater than the upper limit, increases inflow; Otherwise then turn down water valve, reduce inflow.When the OB value is suitable, gather distribution of particles information automatically.When water valve closes to minimum value (but can not can not stop for zero), the OB value still less than lower limit and constantly decline, then stops to gather, and carries out statistical computation, particularly calculates eigenwert Pv ₁₀* D ₃₂, Pv ₁₀Be the percent by volume less than particle below 10 microns, D ₃₂Be the Suo Taier diameter, and the output result, monitoring OB value continued simultaneously until satisfying the condition that enters next measuring period;

Second step: according to underflow particle sizing result, estimation contains the zinc rate;

Contain the available following formula estimation of zinc rate:

Hzn＝a(Pv ₁₀×D ₃₂) ³+b(Pv ₁₀×D ₃₂) ²+c(Pv ₁₀×D ₃₂)+d

Wherein a, b, c, d value contain zinc rate Hzn and underflow eigenwert Pv by the underflow of actual measurement ₁₀* D ₃₂Historical data return and to obtain, historical data was only got nearest 2 months.

The 3rd step: regulate reuse gas mud characteristic;

If the estimation of hydrocyclone underflow gas mud contains the zinc rate less than setting value, the underflow gas mud can enter blast furnace; Otherwise regulate the duty parameter of hydrocyclone automatically, make the ratio of underflow small particles descend, till reaching the standard that can enter blast furnace; On the contrary, if the estimation of this part mud contains the zinc rate well below established standards, then can suitably improve reclamation rate in the gas mud factory.

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