CN108133106B - Method for estimating moisture content of sintering machine mixture according to water addition amount - Google Patents

Abstract

The invention discloses a method for estimating the moisture content of a sintering machine mixture according to the water addition amount, and belongs to the technical field of sintering. The invention discloses a method for estimating the moisture content of a sintering machine mixture according to the water adding amount. The moisture content of the mixture on the sintering machine is estimated to be H₃，H₃Calculated by the following formula:

Description

Method for estimating moisture content of sintering machine mixture according to water addition amount

Technical Field

The invention relates to the technical field of iron ore sintering, in particular to a method for estimating the moisture content of a sintering machine mixture according to the water addition amount.

Background

Before mixing and granulating, the sintered material has a fine particle size, for example, the concentrate powder in the iron-containing raw material contains more than 60% of a particle size fraction of 0-3mm, the fusing agent and the fuel are crushed in the preparation process of the raw material, wherein the content of 0-3mm is more than 80%, especially the powder with the particle size of less than 0.5mm accounts for about 40% of the total weight, so that the air permeability of a sintered material layer can be seriously influenced when the fine-grained raw material is sintered, and even the fine-grained raw material can be taken away by air flow passing through the material layer when air draft sintering is carried out, so that the loss of the raw material is caused, and the normal operation of the sintering process is. Therefore, it is necessary to mix and granulate the raw material components into a relatively uniform and coarse mixture, thereby improving the air permeability of the material layer.

The moisture control of the sintering mixture is a key link in the sintering production process, and the moisture of the mixture directly influences the granulation and the air permeability of the mixture, influences the change of the vertical sintering speed and influences the quality of sintered mineral products; the sintering process has a long time lag, the stability of the water control of the mixture is the key of the stability of the sintering process, and the smaller the fluctuation range of the water of the mixture is, the stronger the stability of the sintering production process is.

Accurate detection and control of the moisture of the mixture in order to ensure good air permeability and good balling of the mixture in the sintering process is a necessary guarantee for achieving the above-mentioned aim. At present, automatic control of the moisture of the domestic sintering mixture has certain problems in application, most sintering production lines still carry out manual water adding operation, often need to be judged through experience, and effective and accurate control is difficult to carry out, so that the operation precision is poor, and the water distribution precision and the water distribution effect of the sintering mixture are improved.

Through retrieval, the name of the invention is: the invention discloses a method for judging the moisture content of a sintering mixture (application number: 201510944190.7; application date: 2016-10-10). The method for judging the moisture content of the sintering mixture is determined by a Mamdani method in an inference mode. The input to the Mamdani method consists of three parts: the method comprises the following steps of firstly, membership functions of an input quantity sintering end point fuzzy set, a red fire layer brightness fuzzy set and an output quantity moisture fuzzy set; secondly, 25 determined inference rules; and thirdly, converting the input quantity of the actual values of the sintering end point and the red fire layer brightness. The output of the Mamdani method is the value XW before moisture transformation, and after obtaining XW, the moisture of the sintering mixture is judged by the transformation function of moisture. However, the water distribution accuracy of the method is still poor; and the method is difficult to judge the moisture content of the mixture on the sintering machine according to the water adding amount, and influences the water blending amount in the process of sintering and mixing materials.

In addition, the name of the invention is as follows: a moisture control method of mixture for sintering production adopts a PLC system and a development tool; the control process comprises the following steps: data acquisition, signal display and data processing, manual information input, fuzzy control model operation and regulation, control quantity output, model self-adaptation and artificial intelligence mode judgment and correction. The automatic dynamic control of the water adding amount of the sintering mixture is realized, so that the water content of the mixture meets the sintering production requirement, and the data such as the real-time water content and the water adding amount of the material in the production process, the operation mode and the like are displayed. The control method is suitable for water adding amount control in the raw material mixing process in various sintering production processes, can be realized by designing an independent control system or utilizing a PLC (programmable logic controller) control system based on automatic production process control, and is less restricted by field conditions. However, it is difficult to determine the moisture content of the mixture on the sintering machine from the water addition amount by this method, and the water blending amount in the process of sintering the mixture is affected.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defects that in the prior art, the moisture content of a mixture on a sintering machine is difficult to judge according to the water adding amount in the material mixing process, so that the moisture of the mixture on the sintering machine is difficult to predict, and the process optimization of sintering production is influenced.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention relates to a method for estimating the moisture content of a mixture of a sintering machine according to the water adding amount, which estimates the moisture content of the mixture on the sintering machine as H₃，H₃Calculated by the following formula:

A₁: the water content of the mixed material after mixing;

A₂: the water content of the mixed material after the second mixing;

M₀: raw material quality;

W₀: the total water addition of the sinter mix is W₀＝W₁+W₂；

W₁: a mixed water adding amount;

W₂: adding water for the second mixing;

γ₁: the water evaporation rate of the first mixed material;

γ₂: the water evaporation rate of the second mixed material;

γ₃: the water evaporation rate of the mixture of the sintering machine;

W_S3: water absorption of the first mixed quicklime W_S3＝m_S·α_S3·β_S32.14%; wherein alpha is_S3The water absorption of quicklime; beta is a_SCaO content of quicklime, m_SThe blanking amount of the quicklime in unit time; (ii) a

W_B3: water absorption of primary mixed dolomite, W_B3＝m_B·α_B3·β_B32.14%; wherein alpha is_B3The water absorption of dolomite; beta is a_BCaO content of quicklime, m_BThe discharge amount in the dolomite position time.

Preferably, said γ is₁Is 15 to 25%, gamma₂Is 2-8%, gamma₃The value of (a) is 1-5%.

Preferably, alpha_S3The value is 5-15%.

Preferably, alpha_B3The value is 5-8%.

Preferably, the water adding amount of the first mixture is W₁And is calculated by the following formula:

wherein the specific reference numerals have the following meanings:

H₁: mixing target moisture;

A₀: the original water content of the raw materials;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S32.14%; wherein alpha is_S1Absorption of quicklimeWater rate; beta is a_SCaO content of quicklime;

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

Preferably, said α is_S1The value is 50-70%, alpha_B1The value is 60-80%.

Preferably, the water adding amount of the two mixtures is W₂And is calculated by the following formula:

wherein the specific reference numerals have the following meanings:

H₂: secondly, mixing target moisture;

A₁: the water content of the mixed material after mixing;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S32.14%; wherein alpha is_S1The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

W_S2: water absorption of the two-component mixed quicklime W_S2＝m_S·α_S2·β_S32.14%; wherein alpha is_S2The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B2: water absorption of the two-mixed dolomite W_B2＝m_B·α_B2·β_B32.14%; wherein alpha is_B2The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

Preferably, said α is_S2The value is 15-30%; alpha is alpha_B2The value is 5-15%.

Preferably, the water content A of the mixture after the two-mixing₂Calculated by the following formula:

A₂＝(1-γ₂)*((1-γ₁)·(A₀+W₁-W_S1-W_B1)+W₂-W_S2-W_B2)

A₀: the original water content of the raw materials;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S32.14%; wherein alpha is_S1The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

W_S2: water absorption of the first mixed quicklime W_S2＝m_S·α_S2·β_S32.14%; wherein alpha is_S2The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B2: water absorption of primary mixed dolomite, W_B2＝m_B·α_B2·β_B32.14%; wherein alpha is_B2The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:

the method for estimating the moisture content of the mixture of the sintering machine according to the water adding amount comprises the following steps of estimating the moisture content of the mixture on the sintering machine

The moisture content of the mixture on the sintering machine can be estimated according to the water adding amount in the sintering and material mixing process, so that an operator can estimate the water adding amount in the previous material mixing processThe moisture content of the mixture on the sintering machine in the later period is estimated, so that an operator can conveniently adjust the water adding amount in the sintering and mixing process according to the process condition of the moisture of the sintering mixture, and further, the water adding amount in the sintering and mixing process can be conveniently optimized;

the invention is realized by adopting

The water distribution amount of the mixture is obtained through calculation, and the water adding amount can be calculated by adopting an objective formula, so that the accuracy and the objectivity of operation are improved, and the water distribution precision of the sintering mixture is improved. And after the material is wetted by water to the maximum molecular bound water, the returning particles are used as the core to start forming the mother ball, the wetted material is subjected to the rolling and twisting action, and the particles are pulled to the center of capillary water to quickly form the mother ball under the action of capillary force, so that the forming process of the mother ball is accelerated, and the effect of uniform mixing and granulation is improved;

and, adopt

The water adding amount of the secondary mixing is calculated, so that the water adding amount of the secondary mixing is more proper, the accuracy of the secondary mixing water adding is improved, the subjectivity in the water adding process is avoided, the accuracy of the secondary mixing water adding is improved, the moisture content on the surface of the mother ball is close to the proper capillary water content in the secondary mixing process, the moisture content in other mineral powder is lower, the mother ball rolls in a pelletizer and is further compressed, the shape and the size of capillaries among materials are changed, the excessive capillary water is extruded to the surface of the mother ball, particles with relatively low wetting degree are adhered in motion, and the mother ball further grows after repeated for many times, so that the granulating effect of the mixture is improved;

the water adding amount of the sintering mixture is accurately adjusted in steps, so that the water adding amount of the sintering mixture is more accurate, the 0-3mm level content is reduced through mixture pelletizing, the air permeability of a sintering material layer can be improved to a great extent, the proper moisture content of the sintering mixture enables the mixture to have good heat absorption and heat transfer functions in the sintering process, the heat exchange condition of the material layer can be effectively improved or increased, meanwhile, the surface roughness of the material is reduced, the proper moisture content of the mixture supplies trace oxygen in the sintering combustion process, the air flow resistance is reduced, the sintering process is strengthened, the sintering yield is increased, and the quality is improved.

Detailed Description

Exemplary embodiments of the invention are described in detail below, and although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.

Example 1

The raw materials used for sintering comprise iron-containing raw materials, flux and fuel, wherein the raw materials contain a certain amount of original water, but the water content value of the raw materials does not meet the sintering requirement, and the water is supplemented during primary mixing and secondary mixing respectively according to the size of the original water in the sintering mixing process. The primary mixing mainly aims at adding water for wetting and uniformly mixing to ensure that the moisture, the granularity and each component in the mixture are uniformly distributed, and the secondary mixing also needs to supplement wetting besides continuously mixing, and mainly aims at granulating.

The sinter contains crystalline water, which is mainly derived from the ore itself, and physical water, which is derived from the external addition of water to the material. Water is added into the powdery sintering material, which is mainly beneficial to the balling and granulation of the mixture and improves the air permeability of the material layer; secondly, in the sintering process, the water has the functions of heat absorption and heat transfer, and the heat exchange condition of a material layer can be effectively improved or increased; and the surface roughness of the material is reduced, and under the action of similar lubricant, trace oxygen is supplied in the sintering combustion process, the airflow resistance is reduced, and the sintering process is strengthened. If the moisture is too dry, flame is sprayed out during ignition, the surface is not agglomerated, and the return ores are increased, so that the sintering yield and the strength are reduced at the same time. If the moisture is excessively wet, the thickness of the sintered excessively wet layer is increased, and at the same time, the air flow resistance is increased, which seriously deteriorates the sintering permeability and at the same time, lowers the sintering vertical sintering speed and the yield. Therefore, moisture control has a crucial impact on sintering production efficiency and quality.

The invention discloses a water distribution method of a precisely adjusted sintering mixture, which is characterized in that before water distribution, data are firstly acquired, and the actual blanking amount of the blanking amount of each bin is acquired, wherein the bins comprise bins of iron-containing raw materials (the iron-containing raw materials comprise concentrate powder, return fines, fly ash and the like), fuel bins and bins of a fusing agent, the fusing agent comprises quicklime and dolomite, and the blanking amount of the quicklime in unit time is m_SThe blanking amount in the dolomite position time is m_B(ii) a Wherein the blanking amount of the non-flux raw material is m_iNon-flux feedstock comprising iron-containing feedstock and fuel; and simultaneously collecting the water content value of each material, wherein the water content of the quicklime is Y_SThe water content of dolomite is Y_BWherein the blanking amount of the stock bins of the iron-containing raw material and the fuel are respectively Y_i；

And simultaneously setting: a target water content H₁(ii) a Target value of water content H of two-component mixture₂(ii) a And simultaneously detecting to obtain a first-mixed online moisture detection value H'₁And the online moisture detection value H 'after secondary mixing'₂. And simultaneously considering the water absorption rate of the sintering flux: the flux used in sintering production has high CaO content of quicklime and dolomite, and generates a digestion exothermic reaction when meeting water in a material mixing stage to generate CaO (OH)₂A certain amount of water is consumed.

Secondly, the mixing system is divided into three stages, wherein the first stage is mixing: the batching chamber is connected with a water mixing detection point; and a second stage of mixing: a first mixed water detection point to a second mixed water detection point; the third stage sintering machine: and a second mixed water detection point to the sintering machine.

The invention relates to a water distribution method of a sintering mixture with accurate adjustment, which comprises the steps of firstly setting a mixing target water content value H₁，H₁Generally set between 7.2 and 7.5;this example is 7.40%.

The total water addition of the sinter mix is W₀；W₀＝W₁+W₂，W₁The amount of water added is W₂Adding water for mixing;

the water adding amount of the first mixing is W₁And is calculated by the following formula:

TABLE 1 feed amount of each raw material and moisture content of raw material

Wherein the specific reference numerals have the following meanings:

H₁: a mixing of target water content H₁Generally set between 7.2 and 7.5; this example is 7.40%;

M₀: mass of raw materials, wherein

Wherein m is_iDenotes the mass of non-flux material in item i, notably m_iComprises limestone powder, the addition of the limestone powder is m_iCalculating; i.e. the raw materials except the quicklime powder and the dolomite powder are all according to m_iCalculating;

A₀: raw material original water content, wherein

γ₁: water evaporation rate of a mixed material, gamma₁The value of (a) is 15-25%, and the value of (b) is 16%;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S32.14%; wherein alpha is_S1Water absorption of quicklime, alpha_S1The value is 50-70%, and 60% is adopted in the implementation; beta is a_SThe CaO content of the quicklime adopted this time is detected to be 78.88%, and W is obtained by calculation_S1＝5.48t/h；

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1Is the water absorption of dolomite, alpha_B1The value is 60-80%, and 70% is taken in the embodiment; beta is a_BThe CaO content of the quicklime adopted this time is detected to be 48.88%, and W is obtained by calculation_B1＝1.87t/h；

Calculating to obtain W₁＝40.2t/h。

By setting the target water content, the proper water adding amount is calculated, and the water distribution precision of the sintering mixture is improved. And after the material is wetted by water to the maximum molecular bound water, the returning particles are used as the core to start forming the cue ball, the wetted material is subjected to the rolling and twisting action, and the particles are pulled to the center of capillary water to quickly form the cue ball under the action of capillary force, so that the forming process of the cue ball is accelerated, and the effect of uniform mixing and granulation is improved.

Further, the water adding amount of the second mixing is W₂And is calculated by the following formula:

wherein the specific reference numerals have the following meanings:

A₁: water content of the mixture after the first mixing, A₁＝(1-γ₁)*(A₀+W₁-W_S1-W_B1)；

H₂: two mixing of target Water content, H₂Generally set between 7.4 and 7.6; this example was 7.44%;

γ₂: water evaporation rate of the two-mix mixture, gamma₂The value of (a) is 2-8%, and the value of (b) is 3%;

W_S2: two-mixed quicklime suckerAmount of water, W_S2＝m_S·α_S2·β_S32.14%; wherein alpha is_S2Water absorption of quicklime, alpha_S2The value is 15-30%, and 20% is adopted in the implementation; beta is a_SThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_S2＝1.83t/h；

W_B2: water absorption of the two-mixed dolomite W_B2＝m_B·α_B2·β_B32.14%; wherein alpha is_B2Is the water absorption of dolomite, alpha_B1The value is 5-15%, and 10% is adopted in the embodiment; beta is a_BThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_B2＝0.27t/h；

Calculating to obtain W₂＝4.8t/h。

Thereby obtaining the total water adding amount W by calculation₀＝W₁+W₂＝45t/h。

By setting target moisture, the obtained secondary mixed water addition amount is accurately calculated, so that after the secondary mixed water addition, the moisture content on the surface of a mother ball is close to the proper capillary moisture content, the moisture content in other mineral powder is lower, the mother ball rolls in a ball making machine and is further compressed, the shape and the size of capillaries among materials are changed, the excessive capillary water is extruded to the surface of the mother ball, particles with relatively low wetting degree are adhered in motion, and after repeated for multiple times, the mother ball further grows up, so that the granulating effect of the mixed material is improved; under the mechanical action of rolling and twisting, the particles in the green ball are arranged according to the largest contact area, the particles in the green ball are further compacted, a film layer is shared by a plurality of particles to form the green ball, wherein the particles are mutually combined by the action of molecular adhesive force, capillary force and internal friction force, the mechanical strength is increased, and if all capillary water is discharged from the green ball, the green ball with the largest mechanical strength is obtained.

The water adding amount of the sintering mixture is accurately adjusted in steps, so that the water adding amount of the sintering mixture is more accurate, the sintering mixture is properly distributed by a water feeding method, the mixed mixture is pelletized by the mixture, the content of 0-3mm grade is reduced, and the air permeability of a sintering material layer can be improved to a great extent; in addition, the water adding amount can be accurately adjusted according to the actual situation in the sintering process, the proper moisture content of the sintering mixture enables the mixture to have good heat absorption and heat transfer functions in the sintering process, the heat exchange condition of a material layer can be effectively improved or increased, meanwhile, the surface roughness of the material is reduced, the proper moisture content of the mixture supplies trace oxygen in the sintering combustion process, the airflow resistance is reduced, the sintering process is strengthened, the sintering yield is increased, and the quality is improved.

Example 2

The invention relates to a method for estimating the moisture content of a mixture of a sintering machine according to the water adding amount, which adopts the water adding amount calculated in the embodiment 1 and further estimates the final moisture of the sintering machine by setting the water adding amount of a primary mixing and a secondary mixing; the moisture content of the mixture on the sintering machine is estimated to be H₃，H₃Calculated by the following formula:

A₂: water content of the mixture after two mixing, A₂＝(1-γ₂)*(A₁+W₂-W_S2-W_B2)；

γ₃: water evaporation rate of sinter mix, gamma₃The value of (a) is 1-5%, and the value of (b) is 1% in the embodiment;

W_S3: water absorption W of mixed quicklime of sintering machine_S3＝m_S·α_S3·β_S32.14%; wherein alpha is_S3Water absorption of quicklime, alpha_S3The value is 5-15%, and 10% is adopted in the implementation; beta is a_SThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_S2＝0.91t/h；

W_B3: water absorption of sintering machine mixed dolomite, W_B3＝m_B·α_B3·β_B32.14%; wherein alpha is_B3Is the water absorption of dolomite, alpha_B3The value is 5-8%, and 5% is taken in the embodiment; beta is a_BThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_B2＝0.13t/h；

Calculating to obtain H₃＝7.25％。

Example 3

The basic contents of this embodiment are the same as embodiment 1, except that: the raw material ratios and the water contents of the examples are shown in table 2.

TABLE 2 feed amount of each raw material and moisture content of the raw material

(1-1) Water absorption of quicklime at the time of mixing_S1Calculated by the following formula:

K_S1: coefficient of water absorption of quick lime in mixture, K_S1The value is 0.16-0.20; in this example, 0.18 is taken

t₁: mixing time of first mixing, t₁The range of (1) is 3-6 min, in this embodiment, 5min is taken

The percentage of the particle size of the quicklime is less than or equal to 3mm,

the value is 92-95%, and 92% is taken in the embodiment;

H₁: the target moisture content in this example was 7.39%;

T₁: temperature of the mixture, T₁The temperature is 40-55 ℃, and in the embodiment, 44 ℃ is adopted;

m of the present embodiment_s＝40t/h，M₀＝798.50t/h；

Calculating to obtain alpha_S1＝54.99％；

(1-2) Water absorption of dolomite_B1Calculated by the following formula:

K_B1: coefficient of water absorption of quick lime in mixture, K_B1Value of 1.9X 10^-1～2.5×10^-1This example takes K_B1＝2.3×10^-1

t₁: mixing time of first mixing, t₁The range of (1) is 3-6 min, in this embodiment, 5min is taken

The percentage of the dolomite granularity is less than or equal to 3mm,

the value is 92-95%, and 92% is taken in the embodiment;

H₁: the target moisture content in this example was 7.39%;

T₁: temperature of the mixture, T₁The temperature is 40-55 ℃, and in the embodiment, 44 ℃ is adopted;

calculating to obtain alpha_B1＝68.29％；

The total water addition of the sinter mix is W₀；W₀＝W₁+W₂，W₁The amount of water added is W₂Adding water for mixing;

the water adding amount of the first mixing is W₁And is calculated by the following formula:

γ₁: water evaporation rate of a mixed material, gamma₁The value of (a) is 15-25%, and 17% is taken in the embodiment;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S·32.14％；β_SThe CaO content of the quicklime adopted this time is detected to be 78.88%, and W is obtained by calculation_S1＝5.58t/h；

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BThe CaO content of the quicklime adopted this time is detected to be 48.88%, and W is obtained by calculation_B1＝1.82t/h；

Calculating to obtain W₁41.92 t/h; by setting the target water content, the proper water adding amount is calculated, and the water distribution precision of the sintering mixture is improved. And after the material is wetted by water to the maximum molecular bound water, the returning particles are used as the core to start forming the cue ball, the wetted material is subjected to the rolling and twisting action, and the particles are pulled to the center of capillary water to quickly form the cue ball under the action of capillary force, so that the forming process of the cue ball is accelerated, and the effect of uniform mixing and granulation is improved.

(2-1) Water absorption of quicklime in the second mixing_S2Calculated by the following formula:

K_S2: coefficient of water absorption of quicklime in the second mixture, K_S2Value of 1.2X 10^-2～1.5×10^-2This example takes K_S2＝1.2×10^-2；

t₂: blending time of the two blends, t₂The value is 3-6 min, t is taken in the embodiment₂＝5min；

T₂: the temperature of the second mixed material is 35-45 ℃, and 43 ℃ is adopted in the embodiment;

H₂: the two-step mixing of the target water content,this example was taken 7.50%;

calculating to obtain alpha_S2＝24.95％；

(2-2) Water absorption of Dolomite in two cases_B2Calculated by the following formula:

K_B2: coefficient of water absorption of quicklime in the second mixture, K_B2Value of 7X 10^-3～8×10^-3This example takes K_B2＝1.2×10^-2；

t₂: blending time of the two blends, t₂The value is 3-6 min, t is taken in the embodiment₂＝5min；

T₂: the temperature of the second mixed material is 35-45 ℃, and 43 ℃ is adopted in the embodiment;

H₂: the target moisture content of the second mixture, which is 7.50% in this example;

calculating to obtain alpha_B2＝10.52％；

Further, the water adding amount of the second mixing is W₂And is calculated by the following formula:

wherein the specific reference numerals have the following meanings:

A₁: water content of the mixture after the first mixing, A₁＝(1-γ₁)*(A₀+W₁-W_S1-W_B1)；

H₂: two mixing of target Water content, H₂Generally set between 7.4 and 7.6; this example was taken 7.50%;

γ₂: water evaporation rate of the two-mix mixture, gamma₂The value of (a) is 2-8%, and the value of (b) is 3%;

W_S2: water absorption of the two-component mixed quicklime W_S2＝m_S·α_S2·β_S32.14%; wherein alpha is_S2The CaO content of the adopted quicklime is detected to be 78.88 percent and W is detected to be the water absorption of the quicklime and the CaO content of the quicklime_S2＝2.53t/h；

W_B2: water absorption of the two-mixed dolomite W_B2＝m_B·α_B2·β_B32.14%; wherein alpha is_B2Is the water absorption of dolomite, beta_BThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_B2＝0.28t/h；

Calculating to obtain W₂＝5.96t/h。

Thereby obtaining the total water adding amount W by calculation₀＝W₁+W₂＝47.88t/h。

The water content of the mother ball surface is close to the proper capillary water content after the water content of the mother ball is accurately calculated by setting the target water content, the water content of other mineral powder is low, the mother ball rolls in the pelletizer, the shape and the size of capillary tubes among materials are changed, the excessive capillary water is extruded to the mother ball surface, particles with relatively low wetting degree are adhered to the mother ball in motion, the mother ball grows further, and the pelletizing effect of the mixture is further improved; under the mechanical action of rolling and rubbing, the particles in the green ball are further compacted, and a film layer is shared by a plurality of particles to form the green ball, wherein each particle is mutually combined by the action of molecular bonding force, capillary force and internal friction force, the mechanical strength is increased, and if all capillary water is discharged from the green ball, the green ball with the maximum mechanical strength is obtained.

The water adding amount of the sintering mixture is accurately adjusted in steps, so that the water adding amount of the sintering mixture is more accurate, the sintering mixture is properly distributed by a water feeding method, the mixed mixture is pelletized by the mixture, the content of the mixed mixture in the grade of 0-3mm is reduced, and the air permeability of a sintering material layer can be improved to a great extent; in addition, according to the actual situation in the sintering process, the water adding amount is accurately adjusted, so that the mixture has good heat absorption and heat transfer functions, the heat exchange condition of a material layer can be effectively improved or increased, the airflow resistance is reduced, the sintering process is strengthened, the sintering yield is increased, and the quality is improved.

Example 4

Using the amount of water added calculated in example 3, the final moisture of the sintering machine was further estimated by setting the amount of water added for the first and second mixes, and the final moisture was H₃

The water absorption rate alpha of the quicklime of the sintering machine_S3Calculated by the following formula:

K_S3: coefficient of water absorption of quicklime on the sinter, K_S3Value of 1.8 × 10^-2～2.5×10^-2(ii) a This example takes K_S3＝2.0×10^-2；

t₃: residence time of the material in the sintering machine, t₃The value is 3-5 min, and the value is 4min in the embodiment;

T₃: temperature of sinter mix, T₃The value is 25-35 ℃, and the value of the embodiment is 25 ℃;

calculating to obtain alpha_S3＝8.79％；

Water absorption alpha of dolomite in sintering machine_B3Calculated by the following formula:

K_B3: coefficient of water absorption of quicklime on the sinter, K_B3Value of 8 × 10^-3～1.6×10^-2(ii) a (ii) a This example takes K_B3＝1.0×10^-2；

t₃: residence time of the material in the sintering machine, t₃The value is 3-5 min, and the value is 4min in the embodiment;

T₃: temperature of sinter mix, T₃The value is 25-35 ℃, and the value of the embodiment is 25 ℃;

calculating to obtain alpha_B3＝5.29％；

A₂: water content of the mixture after two mixing, A₂＝(1-γ₂)*(A₁+W₂-W_S2-W_B2)；

γ₃: water evaporation rate of sinter mix, gamma₃The value of (a) is 1-5%, and the value of (b) in the embodiment is 1.1%;

W_S3: water absorption W of mixed quicklime of sintering machine_S3＝m_S·α_S3·β_S32.14%; wherein alpha is_S3Water absorption of quicklime, beta_SThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_S2＝0.89t/h；

W_B3: water absorption of sintering machine mixed dolomite, W_B3＝m_B·α_B3·β_B32.14%; wherein alpha is_B3The water absorption of dolomite; beta is a_BThe CaO content of the quicklime adopted at this time is detected to be 78.88 percent, and W is_B2＝0.14t/h；

Calculating to obtain H₃＝7.30％。

Example 5

In the method for automatically controlling the moisture of the sinter mixture,

s100, controlling the moisture of the mixture in the primary mixing process, and firstly setting a target moisture H₁(ii) a Detecting the water content of the first mixed mixture to be H'₁(ii) a When is H'₁-H₁When | > 0.1%, correcting the water addition amount in the sintering and mixing process as follows: w'₁Further controlling the water adding amount in the first mixing process; the detailed description is as follows:

s110, calculating to obtain W as water addition amount of the mixture-mixture₁

The water adding amount of the first mixing is W₁And is calculated by the following formula:

the specific ingredients and parameters of example 1 were used, with the following differences: h₁7.33 percent; the other data parameters were calculated to obtain W as in example 1₁＝39.78t/h；

S120, detecting that the moisture of the mixture after primary mixing is H'₁Wherein H'₁＝7.45％

S130, is | H'₁-H₁When | > 0.1%, correcting the water adding amount of the mixture into a mixture as follows: w₁′

W′₁＝W₁+50％×(H₁-H′₁)·(T₀+W₁-γ₁·(A₀+W₁-W_S1-W_B1))；

And calculating to obtain W'₁39.28 t/h; and detecting H'₁＝7.39％；|H′₁-H₁|≤0.1％；

Repeating the step (2) and the step (3) until | H'₁-H₁|≤0.1％；

S200, controlling the moisture of the mixture in the second mixing process, and firstly setting a target moisture H₂(ii) a Detecting that the water content of the mixture after the second mixing is H'₂(ii) a When is H'₂-H₂When | > 0.1%, correcting the water addition amount in the sintering and mixing process as follows: w'₂Further controlling the water adding amount in the second mixing process;

s210, calculating the water adding amount W of the mixture two-mixing₂

The water adding amount of the second mixing is W₂And is calculated by the following formula:

the specific ingredients and parameters of example 1 were used, with the following differences: h₂7.24 percent; other data parameters were calculated as in example 1To obtain W₁＝3.3t/h；

S220, detecting that the moisture of the mixture after the secondary mixing is H'₂Wherein H'₂＝7.35％

S230, when | H'₂-H₂When | > 0.1%, correcting the water adding amount of the mixture into a mixture as follows: w'₂

W′₂＝W₂+50％×(H₂-H′₂)·(T₀+W₁+W₂-γ₂·(A₀+W₁+W₂-W_S1-W_B1-W_S2-W_B2)-γ₁(1-γ₂)·(A₀+W₁-W_S1-W_B1))；

And calculating to obtain W'₁2.84 t/h; and detecting H'₁＝7.28％；|H′₂-H₂|≤0.1％；

Repeating the step (2) and the step (3) until | H'₂-H₂|≤0.1％；

By adjusting the water adding amount W of primary mixing in the sintering and mixing process₁Water addition amount W of the mixture of water and water₂Further controlling the total water adding amount W in the sintering and mixing process₀(ii) a The water adding amount W is obtained by calculation₀42.12 t/h. Therefore, the accuracy of water addition in the sintering and material mixing process is improved, the sintering mixture is subjected to appropriate water distribution by a water feeding method, the accuracy of water distribution of the mixture is improved, the mixed mixture is pelletized by the mixture, the content of 0-3mm grade is reduced, the air permeability of a sintering material layer can be improved to a great extent, the sintering yield is increased, and the quality is improved. It is worth noting that the vertical sintering rate is reduced and the yield is reduced if the pellets are too large.

The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description is to be construed as illustrative only and not restrictive, and any such modifications and variations are intended to be included within the scope of the invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.

More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. For example, in the present invention, the term "preferably" is not exclusive, and it means "preferably, but not limited to" herein. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims (9)

1. A method for estimating the moisture content of a sintering machine mixture according to the water adding amount is characterized in that: the moisture content of the mixture on the sintering machine is estimated to be H₃，H₃Calculated by the following formula:

A₁: the water content of the mixed material after mixing;

A₂: the water content of the mixed material after the second mixing;

M₀: raw material quality;

W₀: the total water addition of the sinter mix is W₀＝W₁+W₂；

W₁: a mixed water adding amount;

W₂: adding water for the second mixing;

γ₁: the water evaporation rate of the first mixed material;

γ₂: the water evaporation rate of the second mixed material;

γ₃: the water evaporation rate of the mixture of the sintering machine;

W_S3: water absorption of the first mixed quicklime W_S3＝m_S·α_S3·β_S32.14%; wherein alpha is_S3The water absorption of quicklime; beta is a_SCaO content of quicklime, m_SThe blanking amount of the quicklime in unit time;

W_B3: water absorption of primary mixed dolomite, W_B3＝m_B·α_B3·β_B32.14%; wherein alpha is_B3The water absorption of dolomite; beta is a_BCaO content of quicklime, m_BThe discharge amount in the dolomite position time.

2. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount as claimed in claim 1, wherein the method comprises the following steps: the gamma is₁Is 15 to 25%, gamma₂Is 2-8%, gamma₃The value of (a) is 1-5%.

3. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount as claimed in claim 1, wherein the method comprises the following steps: alpha is alpha_S3The value is 5-15%.

4. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount as claimed in claim 1, wherein the method comprises the following steps: alpha is alpha_B3The value is 5-8%.

5. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount according to any one of claims 1 to 4, wherein the method comprises the following steps: the water adding amount of the first mixing is W₁And is calculated by the following formula:

wherein the specific reference numerals have the following meanings:

H₁: mixing target moisture;

A₀: the original water content of the raw materials;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S32.14%; wherein alpha is_S1The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

6. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount as claimed in claim 5, wherein the method comprises the following steps: a is said_S1The value is 50-70%, alpha_B1The value is 60-80%.

7. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount according to any one of claims 1 to 4, wherein the method comprises the following steps: the water adding amount of the second mixing is W₂And is calculated by the following formula:

wherein the specific reference numerals have the following meanings:

H₂: secondly, mixing target moisture;

A₁: the water content of the mixed material after mixing;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S·32.14％；Wherein alpha is_S1The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BCaO content of quicklime;

W_S2: water absorption of the two-component mixed quicklime W_S2＝m_S·α_S2·β_S32.14%; wherein alpha is_S2The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B2: water absorption of the two-mixed dolomite W_B2＝m_B·α_B2·β_B32.14%; wherein alpha is_B2The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.

8. The method for estimating the moisture content of the sintering machine mixture according to the water addition amount as claimed in claim 7, wherein the method comprises the following steps: a is said_S2The value is 15-30%; alpha is alpha_B2The value is 5-15%.

9. A method of estimating the moisture content of the sinter machine mix from the amount of water added according to any one of claims 1 to 4 or 6 or 8, wherein: water content A of the mixture after the two mixing₂Calculated by the following formula:

A₂＝(1-γ₂)*((1-γ₁)·(A₀+W₁-W_S1-W_B1)+W₂-W_S2-W_B2)

A₀: the original water content of the raw materials;

W_S1: water absorption of the first mixed quicklime W_S1＝m_S·α_S1·β_S32.14%; wherein alpha is_S1The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B1: water absorption of primary mixed dolomite, W_B1＝m_B·α_B1·β_B32.14%; wherein alpha is_B1The water absorption of dolomite; beta is a_BCaO content of quicklime;

W_S2: water absorption of the two-component mixed quicklime W_S2＝m_S·α_S2·β_S32.14%; wherein alpha is_S2The water absorption of quicklime; beta is a_SCaO content of quicklime;

W_B2: water absorption of the two-mixed dolomite W_B2＝m_B·α_B2·β_B32.14%; wherein alpha is_B2The water absorption of dolomite; beta is a_BThe CaO content of the quicklime.