CN105734193A - Rist operating line drawing method applicable to COREX process - Google Patents

Abstract

The invention relates to a Rist operating line drawing method applicable to a COREX process. The Rist operating line drawing method comprises the steps of 1) drawing a Rist operating line of a lower melting gasifier through calculating coordinates of a K point and a P point on the operating line; 2) and drawing a Rist operating line of an upper shaft furnace through coordinates of an A point and the K point on the operating line. According to the Rist operating line drawing method, through analyzing the material balance and heat balance of the upper shaft furnace and the lower melting gasifier in the COREX process, a Rist operating line model applicable to the COREX process is established, and a corresponding operating line diagram is drawn, so that a reference is provided for analyzing the influence of different operating parameters to the energy consumption of the COREX process.

Description

A kind of Rist suitable in COREX flow process operates line method for drafting

Technical field

The present invention relates to molten blast furnace reduction iron production technical field, particularly relate to a kind of Rist suitable in COREX flow process and operate line method for drafting.

Background technology

COREX flow process be at present in the world first successfully realize industrialized Smelting Reduction Process, as it is shown in figure 1, main body is divided into two parts: top reduction shaft furnace and bottom reducing and smelting at end gasification furnace.Shaft furnace top supply iron-bearing material, bottom passes into the reducing gas that melting gasification furnace produces.Iron ore in stove with adverse current reducing gas generation reduction reaction, obtain prereduced metal ferrum；Enter the melting gasification furnace of bottom through screw feeder, carry out whole reduction, finally, carry out slag sluicing system and produce liquid molten iron, complete ironmaking processes.The Energy harvesting computational methods of existing COREX smelting process are disadvantageous in that the many forms with material balance table and heat balance table of result of calculation provide, then analyze carbon element and heat energy utilization degree accordingly, and it is loaded down with trivial details that it calculates process, and result of calculation is directly perceived not.

Blast furnace Rist operates line and describes essence and the rule of blast furnace ironmaking process based on " transfer of oxygen ", the impact of the change Coke Rate of operation factors can be reflected simultaneously, such as gas utilization rate, hot blast temperature and use prereduction iron charge etc., it it is one of utility instructing blast fumance.

Summary of the invention

The invention provides a kind of Rist suitable in COREX flow process and operate line method for drafting, by the material balance of Analysis for CO REX flow process middle and upper part shaft furnace and bottom melting gasification furnace and heat balance, set up the Rist operation line model being applicable to COREX flow process and drafting operates line chart accordingly, provide foundation for analyzing the impact on COREX flow process energy consumption of the different operating parameter.

In order to achieve the above object, the present invention realizes by the following technical solutions:

A kind of Rist suitable in COREX flow process operates line method for drafting, it is characterised in that comprise the steps:

1) by calculating the K point operated on line and the Rist operation line of P point coordinates drafting bottom melting gasification furnace, wherein:

K point coordinates is:

$y_K=1.056x_{{\mathrm{Fe}}_{x}O};$

In formula:——CO₂Volume fraction in melting gasification furnace stock gas；

——H₂O volume fraction in melting gasification furnace stock gas；

Molar fraction shared by FexO in iron oxides；

P point coordinates is:

$x_P=\frac{\[\frac{Q_j}{x+y}+x_K{Q}_{o_2}+\left(\frac{y+z}{x+y}\right)Q_{o_2}\]}{\[Q_b/x_K\]};$

$y_P=1.056x_{{\mathrm{Fe}}_{x}O}-<Q_{Fe}+\frac{n\left(C\right)}{n\left(Fe\right)}\left(\frac{y+z}{x+y}\right)-Q_{o_2}\&lsqb;\left(\frac{y+z}{x+y}\right)\frac{n\left(C\right)}{n\left(Fe\right)}+1.056x_{{\mathrm{Fe}}_{x}O}\&rsqb;>/\&lsqb;Q_b/x_K\&rsqb;;$

In formula: Q_bThe chemical heat of carbon and hydroxide, J/mol；

Q_jThe physical thermal that fuel is brought into, J/mol；

Q_FeThe total amount of heat of liquid iron, J/mol；

The heat that tuyere injection oxygen is brought into, J/mol；

The number of carbon atom during x, y, z COREX flow process is fuel used, hydrogen atom and oxygen atom；

2) Rist being operated by the A point on line and K point coordinates drafting top shaft furnace operates line, and wherein K point coordinates has operated during line coordinates calculates at bottom melting gasification furnace Rist and obtained, A point coordinates:

y_A=n_Fe；

In formula:——CO₂Volume fraction in COREX shaft furnace stock gas；

——H₂O volume fraction in COREX shaft furnace stock gas；

n_FeOxygen atomicity in oxides-containing iron, mol needed for smelting 1mol metal Fe atom.

Compared with prior art, the invention has the beneficial effects as follows:

By the material balance of Analysis for CO REX flow process middle and upper part shaft furnace and bottom melting gasification furnace and heat balance, set up the Rist operation line model being applicable to COREX flow process and drafting operates line chart accordingly, provide foundation for analyzing the impact on COREX flow process energy consumption of the different operating parameter.

Accompanying drawing explanation

Fig. 1 is COREX smelting process flow chart of the present invention.

Fig. 2 is that COREX flow process material of the present invention circulation is changed and moves towards schematic diagram.

Fig. 3 is that the Rist suitable in COREX flow process of the present invention operates line chart.

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:

A kind of Rist suitable in COREX flow process operates line method for drafting, it is characterised in that comprise the steps:

1) by calculating the K point operated on line and the Rist operation line of P point coordinates drafting bottom melting gasification furnace, wherein:

K point coordinates is:

$y_K=1.056x_{{\mathrm{Fe}}_{x}O};$

In formula:——CO₂Volume fraction in melting gasification furnace stock gas；

——H₂O volume fraction in melting gasification furnace stock gas；

Fe in iron oxides_xMolar fraction shared by O；

P point coordinates is:

$x_P=\frac{\&lsqb;\frac{Q_j}{x+y}+x_K{Q}_{o_2}+\left(\frac{y+z}{x+y}\right)Q_{O_2}\&rsqb;}{\&lsqb;Q_b/x_K\&rsqb;};$

$y_P=1.056x_{{\mathrm{Fe}}_{x}O}-<Q_{Fe}+\frac{n\left(C\right)}{n\left(Fe\right)}\left(\frac{y+z}{x+y}\right)-Q_{o_2}\&lsqb;\left(\frac{y+z}{x+y}\right)\frac{n\left(C\right)}{n\left(Fe\right)}+1.056x_{{\mathrm{Fe}}_{x}O}\&rsqb;>/\&lsqb;Q_b/x_K\&rsqb;;$

In formula: Q_bThe chemical heat of carbon and hydroxide, J/mol；

Q_jThe physical thermal that fuel is brought into, J/mol；

Q_FeThe total amount of heat of liquid iron, J/mol；

The heat that tuyere injection oxygen is brought into, J/mol；

The number of carbon atom during x, y, z COREX flow process is fuel used, hydrogen atom and oxygen atom；

2) Rist being operated by the A point on line and K point coordinates drafting top shaft furnace operates line, and wherein K point coordinates has operated during line coordinates calculates at bottom melting gasification furnace Rist and obtained, A point coordinates:

y_A=n_Fe；

In formula:——CO₂Volume fraction in COREX shaft furnace stock gas；

——H₂O volume fraction in COREX shaft furnace stock gas；

n_FeOxygen atomicity in oxides-containing iron, mol needed for smelting 1mol metal Fe atom.

In the present invention, the process of specifically setting up that bottom melting gasification furnace Rist operates line is as follows:

Bottom melting gasification furnace Rist operates the abscissa of line:

$\frac{O+H_2}{C+H_2}=\frac{n_{CO}+2n_{{\mathrm{CO}}_2}+2n_{H_{2}O}+n_{H_2}}{n_{CO}+n_{{\mathrm{CO}}_2}+n_{H_{2}O}+n_{H_2}}=1+\frac{n_{{\mathrm{CO}}_2}+n_{H_{2}O}}{n_{CO}+n_{{\mathrm{CO}}_2}+n_{H_{2}O}+n_{H_2}}---\left(1\right)$

In formula: n_i(i is CO, CO₂,H₂O,H₂) represent CO, CO in reducing gas respectively₂, H₂O and H₂Molal quantity, unit: mol.

Assume that into stove fuel be C_x(H₂)_yO_z, fuel input is n^I, list shown in reaction Carbon balance, oxygen balance and hydrogen balance equation such as formula (2)-(4) respectively:

$n_C^A=x\&CenterDot;n^I-\frac{n\left(C\right)}{n\left(Fe\right)}---\left(2\right)$

In formula:Participate in the carbon molal quantity of chemical reaction, mol；

The carbon molal quantity dissolved in unit mole molten iron, mol.

$n_O^B+1.056x_{{\mathrm{Fe}}_{x}O}+z\&CenterDot;n^I=n_{CO}^g+2n_{{\mathrm{CO}}_2}^g+n_{H_{2}O}^g---\left(3\right)$

In formula:Air port sprays into the molal quantity of pure oxygen, mol；

(i is CO, CO₂,H₂O) CO, CO in reducing gas is represented respectively₂, H₂The molal quantity of O, mol.

$y\&CenterDot;n^I=n_{H_2}^g+n_{H_{2}O}^g=n_{(H_2+H_{2}O)}^g---\left(4\right)$

In formula:H in reducing gas₂Molal quantity, mol.

In the melting gasification furnace of bottom, reducing gas composition is represented by:

Its end product of C participating in chemical reaction is CO and CO₂, therefore:

$n_C^A=n_{CO}+n_{{\mathrm{CO}}_2}---\left(6\right)$

Simultaneous formula (2)～(6), can obtain material balance equation:

Equation of heat balance is:

$Q_{Fe}+n^I\&CenterDot;Q_j+n_O^B\&CenterDot;Q_{o_2}=\&lsqb;n^I(x+y)-\frac{n\left(C\right)}{n\left(Fe\right)}\&rsqb;\&CenterDot;Q_b---\left(8\right)$

Bring formula (1)～(6) into formula (7), obtain:

$n_O^B=-1.056x_{{\mathrm{Fe}}_{x}O}-\left(\frac{y+z}{x+y}\right)\frac{n\left(C\right)}{n\left(Fe\right)}+(n_C^A+n^I\&CenterDot;y)\&lsqb;\frac{O+H_2}{C+H_2}-\left(\frac{y+z}{x+y}\right)\&rsqb;---\left(9\right)$

Formula (9) is rewritable is:

$1.056x_{{\mathrm{Fe}}_{x}O}-\&lsqb;-n_O^B-n^I\&CenterDot;(y+z)\&rsqb;=(n_C^A+n^I\&CenterDot;y)\&lsqb;\frac{O+H_2}{C+H_2}-0\&rsqb;---\left(10\right)$

WillIt is concurrently applied to formula (8), obtains:

$\begin{array}{c}1.056x_{{\mathrm{Fe}}_{x}O}-\{1056x_{{\mathrm{Fe}}_{x}O}-\frac{Q_{Fe}+\frac{n\left(C\right)}{n\left(Fe\right)}\left(\frac{y+z}{x+y}\right)-Q_{o_2}\&lsqb;\left(\frac{y+z}{x+y}\right)\frac{n\left(C\right)}{n\left(Fe\right)}+1.056x_{{\mathrm{Fe}}_{x}O}\&rsqb;}{Q_b/\left(\frac{O+H_2}{C+H_2}\right)}\}\\ =(n_C^A+n^I\&CenterDot;y)\&lsqb;\left(\frac{O+H_2}{C+H_2}\right)-\frac{\frac{Q_j}{x+y}+\left(\frac{O+H_2}{C+H_2}\right)\&CenterDot;Q_{o_2}-\left(\frac{y+z}{x+y}\right)\&CenterDot;Q_{o_2}}{Q_b/\left(\frac{O+H_2}{C+H_2}\right)}\&rsqb;\end{array}---\left(11\right)$

By formula (11), it may be determined that melting gasification furnace Rist operates the K point in line (abscissa is melting gasification furnace stock gas composition, and vertical coordinate is stove sponge iron degree of metalization) and P point coordinates:

K point coordinates is:

$y_K=1.056x_{{\mathrm{Fe}}_{x}O}---\left(13\right)$

P point coordinates is:

$x_P=\frac{\&lsqb;\frac{Q_j}{x+y}+x_K{Q}_{o_2}+\left(\frac{y+z}{x+y}\right)Q_{o_2}\&rsqb;}{\&lsqb;Q_b/x_K\&rsqb;}---\left(14\right)$

$y_P=1.056x_{{\mathrm{Fe}}_{x}O}-<Q_{Fe}+\frac{n\left(C\right)}{n\left(Fe\right)}\left(\frac{y+z}{x+y}\right)-Q_{o_2}\&lsqb;\left(\frac{y+z}{x+y}\right)\frac{n\left(C\right)}{n\left(Fe\right)}+1.056x_{{\mathrm{Fe}}_{x}O}\&rsqb;>/\&lsqb;Q_b/x_K\&rsqb;---\left(15\right)$

In the present invention, the method for building up that top shaft furnace Rist operates line is as follows:

A point is used for the oxidizability described into stove ore oxidation degree and stock gas, its coordinate:

y_A=n_Fe(17)

K point coordinates has operated during line coordinates calculates at bottom melting gasification furnace Rist and has obtained.

The Rist drawing top shaft furnace (A, K point) and bottom melting gasification furnace (K, P point) respectively operates line, thus obtaining the operation line chart of whole flow process, as shown in Figure 2.

Following example are carried out under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.

[embodiment]

Certain COREX this creation data of furnace foundation is respectively in Table 1 and table 2；

Table 1 shaft furnace top gas composition/%

CO	CO2	H2	H2O	Other
					40.75	31.64	14.52	2.56	4.23

Table 2 fusion and gasification furnace roof gas composition/%

CO	CO2	H2	H2O	Other
					62.05	11.32	19.84	2.56	4.23

(2) stove crude fuel composition is entered in Table 3 and table 4；

Table 3 feed stock for blast furnace composition/%

Table 4 enters stove propellant composition/%

Fuel	Vd	Ad	FCd	C	H	O	N	S
									Coke	2.83	0.98	96.19	86.19	0.40	0.36	0.87	0.62
Lump coal	35.80	10.64	53.56	73.72	4.70	9.02	1.35	0.57

(3) other original calculation parameters: degree of metalization MR:70%, iron ore consumption amount 1400kg/tHM, reducing gas consumption 1000Nm³/ tHM, fuel structure is 85% lump coal+15% coke, ω (C)=4.6% in molten iron.

In Fig. 2, each spot temperature of COREX stove is in Table 5.

Each spot temperature/the K of table 5COREX stove

Different parts	T1	T2	T3	T4	T5	T6	T7
								Temperature	298	298	1100	1123	875	875	1743

Can be obtained by formula (16)-(17), A point coordinates:

$y_A=n_{Fe}=\frac{\mathrm{\&omega;}\left({\mathrm{Fe}}_2{O}_3\right)/160\&times;3+\mathrm{\&omega;}\left(FeO\right)/72}{\mathrm{\&omega;}\left({\mathrm{Fe}}_2{O}_3\right)/160\&times;2+\mathrm{\&omega;}\left(FeO\right)/72}=\frac{90.47/160\&times;3+0.22/72}{90.47/160\&times;2+0.22/72}=1.4987$

Can be obtained by formula (12)-(13), K point coordinates:

$y_K=1.056x_{{\mathrm{Fe}}_{x}O}=1.056\&times;(1-0.70)=0.3168$

P point coordinates is calculated by formula (14)-(15):

For C_x(H₂)_yO_zIn x, y, z, owing to lump coal and coke contain multiple compounds, not easily determine, convenient for computing, it is assumed that:

X=C%=0.85 × 73.72+0.15 × 86.19=75.59；

Y=H%=0.85 × 4.70+0.15 × 0.40=4.06；

Z=O%=0.85 × 9.02+0.15 × 0.36=7.72；

Inquiry associated hot Mechanical Data, calculating obtains

Q_j=1071.84kJ/mol；

Q_b=81.62kJ/mol；Q_Fe=114.20kJ/mol；

By molten iron C content, $\frac{n\left(C\right)}{n\left(Fe\right)}=\mathrm{\&omega;}\left(C\right)\&times;\frac{56}{12}=0.21;$

Can be calculated x_P=0.617, y_P=-1.16；

Can being drawn under Current fuel structural condition by data above, the Rist of COREX flow process operates line chart, as shown in Figure 3.

The above; it is only the present invention preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope that the invention discloses; it is equal to replacement according to technical scheme and inventive concept thereof or is changed, all should be encompassed within protection scope of the present invention.

Claims (1)

1. the Rist being applicable to COREX flow process operates line method for drafting, it is characterised in that comprise the steps:

1) by calculating the K point operated on line and the Rist operation line of P point coordinates drafting bottom melting gasification furnace, wherein:

K point coordinates is:

$y_K=1.056x_{{\mathrm{Fe}}_{x}O};$

In formula:——CO₂Volume fraction in melting gasification furnace stock gas；

——H₂O volume fraction in melting gasification furnace stock gas；

Fe in iron oxides_xMolar fraction shared by O；

P point coordinates is:

$x_P=\frac{\&lsqb;\frac{Q_j}{x+y}+x_K{Q}_{O_2}+\left(\frac{y+z}{x+y}\right)Q_{O_2}\&rsqb;}{\&lsqb;Q_b/x_K\&rsqb;};$

$y_P=1.056x_{{\mathrm{Fe}}_{x}O}-<Q_{Fe}+\frac{n\left(C\right)}{n\left(Fe\right)}\left(\frac{y+z}{x+y}\right)-Q_{O_2}\&lsqb;\left(\frac{y+z}{x+y}\right)\frac{n\left(C\right)}{n\left(Fe\right)}+1.056x_{{\mathrm{Fe}}_{x}O}\&rsqb;>/\&lsqb;Q_b/x_K\&rsqb;;$

In formula: Q_bThe chemical heat of carbon and hydroxide, J/mol；

Q_jThe physical thermal that fuel is brought into, J/mol；

Q_FeThe total amount of heat of liquid iron, J/mol；

The heat that tuyere injection oxygen is brought into, J/mol；

The number of carbon atom during x, y, z COREX flow process is fuel used, hydrogen atom and oxygen atom；

2) Rist being operated by the A point on line and K point coordinates drafting top shaft furnace operates line, and wherein K point coordinates has operated during line coordinates calculates at bottom melting gasification furnace Rist and obtained, A point coordinates:

y_A=n_Fe；

In formula:——CO₂Volume fraction in COREX shaft furnace stock gas；

——H₂O volume fraction in COREX shaft furnace stock gas；

n_FeOxygen atomicity in oxides-containing iron, mol needed for smelting 1mol metal Fe atom.