SU1524928A1 - Method of controlling the process of coal dressing - Google Patents

Abstract

The invention relates to the control of coal preparation processes and may find application in the coal and coke industry. The purpose of the invention is to improve the control accuracy by taking into account the ratio of well-sintering fractions (CHF) and weakly caking fractions of coking coals during their separate enrichment in parallel process operations. For this purpose, the content of the HSP in the initial well-sintering angle (XSU), the wetting angle (KUS) and the share of the HFS in the initial HOS are measured, and the weighted average of the KUS is determined. Then, the variance of changes in the contents of industrial products fractions of the initial CSU is measured. Set the ash content of the concentrate CSU in proportion to the weighted average value of KUS. The yield of industrial products fractions changes in proportion to the dispersion of changes in the contents of industrial products fractions of the original XSU, maintaining the output of the concentrate of the XU enrichment operation, and the ash content of the total concentrate is maintained by changing the output of the semi-finished HSF of the enrichment operation of the weakly congruent source coal. Separate enrichment of CSU and low-caking coals prevents the concentrate from clogging with free mineral impurities and reducing the mechanical strength of coke. 3 il.

Description

The invention relates to the control of coal preparation processes with the help of computers and can be used in the coal, coking and chemical industries of the coal industry.

The aim of the invention is to improve the control accuracy by taking into account the ratio of well-sintering and low-adhering fractions of coking coal, with their separate enrichment in parallel operations of the process.

Fig. 1 shows a block diagram of an apparatus for implementing a method for controlling the process of enriching coking coals in parallel with the operation of their jigging of fine coal; Fig. 2 shows the dependence of the wetting angle on the volatile matter for coals of various grades; on fig.Z - dependence of the Horn index (R) on the density of elementary fractions of coal grades K, F, G and OS.

The method consists in measuring the content of well-sintering fractions 3 of the original well-sintering angle, measuring the wetting angle and the proportion of well-sintering fractions in the original well-sintering angle, determining the weighted average wetting angle of the well-sintering fractions in a well-sintering original angle measured proportion and wetting angle of well-sintering fractions in the original well-sintering angle; measure the variance of changes in the contents of the pro-product fractions of the initial spekandtsegos well of coal, the ash content is set well spekayuschegos carbon proportionally weighted average contact angle well spekayuschihs fractions varied output middlings O fractions dispersion proportionally varying contents promproduk- tovyh fractions spekayuschegos carbon source well, maintaining the concentrate output operation enrichment well spekayuschegos carbon source, and the ash content of the total concentrate is maintained by varying the yield of well-sintering product fractions of about The operations of enriching the low-incipient carbon source.

Example. Coal grades K, F, G, OS, T are tentatively divided into groups of well-sintering and low-caking coals, which are fed into the dosing-accumulating bins 1 and 2, respectively. The mixtures of well and weakly coking coal after the dosing accumulation bins 1 and 2 arrive at the classification screens 3 and 4, the sublattice products (13 mm classes) of which enter the jigging machines 5 and 6.

The sampler 7 takes samples of unheated. Well sintering the coal and sends it to the unit 8 for systematically measuring the characteristics of the coal. The sensors 9 of the capacity of the auto-dosing bins 1 determine the fractional shares of q; each well-sintering fraction (charge) in the original well-sintering coal (or a mixture of fractions (mines). All measured values are stored in the memory of the computer 10.

The implementation of the goal occurs in the computer 10 in the following sequence.

The weighted average of the wetting angle of well-sintering fractions in a well-sintering raw angle is determined.

-,

9sr

five

0

five

0

five

0

five

0

five

where q- - equity shares (dale)

the i-th mine of a well-sintering fraction in the original well-sintering coal; 0; - Krabva wetting angle of i-well sintering fraction (mine); n is the number of well-sintering fractions (mines) in the initial well-sintering coal.

The desired ash content of the concentrate, A ,, is found to be proportional to the weighted average wetting angle well.

sintering fractions

ABOUT,

R

on vpazhe. with

J

where a

Kioft

d

9 co-A MOC

 ,

 tsak.s

MOIKC

0

Max

The boundary maximum value of the ash content of the mixture concentrate is well coking xc coals; the maximum value of the wetting angle of the coal fractions entering the raw material base of the concentration plant. As shown in Fig. 2, grades of grades K, F and partially coals of grades of grade OC are of great importance for the wetting angle and they are also well sintered. Coals of grades G, OS, and T are less than the wetting angle and are weakly caking.

In addition, as a result of studies of elementary fractions of typical coxuish 1xc coal of the indicated grades, it was established (FIG. 3) that the lightest fractions with a density of 1300 kg / m have the best caking and bloating. As the separation density increases, sintering decreases, and the fraction with density of 1500 5

1800 kg / m of grade G coal and part of grade OS coal is not sintered at all, while sintering is similar

s

fractions of coal grades K, F and parts of coal grade OS remains quite high. Coals of grade T are emaciated additives to the mixture and are also characterized by weak sintering.

To obtain the greatest effect from the processing of coals with different characteristics, it is necessary to separately enrich well and weakly coking coals, concentrates of which are clogged with free mineral impurities that reduce the mechanical strength of coke, the depth of the enrichment of the ash increases (as the ash content of the concentrate decreases), and d well-sintering coal, the depth of the enrichment decreases (at a lower ash content of the concentrate). At the same time, the maximum boundary value of the ash content of the concentrate is well sintered

concentrate

coal L should not exceed 10%.

Taking into account the technological features of the process of separate enrichment of coking coals, it is necessary to achieve maximum extraction of good sintering coals into total concentrate at a given level of ash content of the total concentrate and when the ash content of the concentrate is good sintering coals not exceeding the maximum maximum value:

fkc

make with A const

BUT,. 6

 to max)

concentrate yield of good sintering coal; total ash ash

centrate;

the ash content of the concentrate is well sintering coals;

The boundary maximum value of the ash content of the concentrate is well sintering-WJixc coals.

the reduction of a given value of a concentrate of good coals A according to the average value of the contact angle, the task of enrichment in the production of a jigging machine is solved

5, which corresponds to the value

l

K -.at, For this purpose, the sieve and fractional composition of the charge r and the expected enrichment results with an initial separation density of 1300 kg / m are determined using the previously measured sieve and fractional compositions of large well-sintering coals in the mixture.

Find the difference between the ash content of concentrate A, determined at the initial separation density, and the ash content A J, g, defined in proportion to the value of the weighted average wetting angle:

LA,

The cop

- BUT

K} 01A

0 5 0

five

ABOUT

0

Compare iA with a given value. If the corresponding split value is

pre-set .. With

-

LA,

that

density optimal.

If LA, then the initial value of the density of separation in the industrial compartment is increased by the selected value of the step of changing the density lr 25 kg / m and already at a new density of separation, the calculation of the expected enrichment results is repeated and so on until the condition LA is fulfilled. (.,.

With the optimum separation density found, the amount of middling that needs to be extracted is determined to ensure that the ash content is

 CSR

cheniyu

corresponded to the calculated value

By Rasch

five

The ash content A c calculates a task in the stabilization system of the output of intermediate product 11 of a calculated value by an amount proportional to the variance of the change in the industrial fraction in a mixture of well-sintering coal. This is due to the fact that under such a mode of operation of the jigging machine with a constant amount of produced intermediate product under the influence of disturbances introduced by the original coal, fluctuations in the ash content of the concentrate of good sintering coal are observed. Therefore, in order to avoid exceeding the specified value of the ash content of the concentrate due to the ingestion of a high-ash middlings product, the calculated amount of the produced middling product is increased by an amount proportional to

five

dispersion changes in the content of industrial product fractions in the original well-sintering coal.

In this mode of operation, the depositing machine, which enriches highly sintering coals, produces concentrate with an ash content that does not exceed the specified value A, jg, proportional to the weighted average wetting angle and increased sintering fractions, due to extraction of the well-sintering product fractions into the concentrate.

The ash content of the total concentrate Aj (. Is maintained at a predetermined level by measuring its actual ash content by sensor 12, comparing it with a specified value A, g, d in the controller 13 of the stabilization system and issuing a control action to the system 14 for stabilizing the height of the compacted bed of the depositor 6, which enriches low-caking coals, which results in a change in the yield of well-sintering industrial products fractions of the enrichment operation of low-caking original coal. Jigging machines 5 and 6 concentrates enter the dehydration s devices 15.

The use of the invention allows to increase the concentrate yield of well-sintering coals by 0.3%.

Claims (1)

Invention Formula The method of controlling the process of coal enrichment, based on measuring the ash content of the total concentrate, determining the sieve and fractional composition of the original coal and maintaining the maximum yield of sum 0 five 0 five 0 Marked concentrate of a given ash content in the process by changing the concentrate yield on individual operations, characterized in that, in order to improve control accuracy by taking into account the ratio of well-sintering and weakly coking coking coal fractions when they are separately enriched in parallel process operations, the content is well sintering fractions in the original well-sintering angle, the wetting angle is measured and the proportion of well-sintering fractions in the original well-sintering angle, the average star is determined The value of wetting angle of well-sintering fractions in the original well-sintering angle is proportional to the measured proportion and wetting angle of well-sintering fractions in the original well-sintering coal; wetting angle of well sintering fractions, change the yield of industrial products fractions in proportion to dispersions of changes in the contents of the industrial product fractions of the original well-sintering coal, maintaining the concentrate yield of the operation of the enrichment of the well-sintering original coal, and the ash content of the total concentrate is maintained by changing the yield of the well-sintering industrial fractions of the enrichment operation of the low-caking original coal. Good Sykayutsy9 coy coals C /} aSo Sintering Coals - {Znm Waste FIG. npOHnpodj / Kirt LI-I L OS ten U8.2 2030 Bbifod volatile 7f ts  with 50 I j 2U -t I I four Well L fO