SU1214641A1 - Method of controlling process for producing mineral fertilizers by layer-to-layer spraying of acid and alkaline components of pulp - Google Patents

Description

The invention relates to process control and can be used in the mineral fertilizer industry during the production of ammophos.

The purpose of the invention is to increase the yield of finished products and improve its quality.

The drawing shows a block diagram of a control system implementing the proposed method.

Technological scheme and control system contains pipeline 1 for feeding pulp to nozzle 2 of drum granulator dryer 3 (HCV), meters 4-6, respectively, humidity, temperature and flow of pulp, regulating valve 7 for feeding pulp, pipeline 8 for supplying total compressed air for dispensing pulp in BGS, gauge 9 and the control valve 10 flow of longitudinal compressed air installed on the pipeline P, gauge 12 pressure of the longitudinal compressed air, pipeline 13 and gauge 14 of the pressure of transverse compressed air, measured The generator 15 of the total compressed air flow, pipe 16 and the control valve 17 for supplying phosphoric acid, furnace 18, pipe 19 and control valve 20 for supplying secondary air to the furnace, pipe 21 and control valve 22 for supplying fuel to the furnace, pipe 23 and measuring 24 of the furnace temperature gases, pipe 25 to the gauge 26 of the temperature of the exhaust gases from the BGS, pipe 27 of the product outlet from the BGS, regulator 28 of the pulp flow rate, controller 29 of the ratio of the costs of the pulp and longitudinal compressed air, measureJS 30 and 31 density and flow phosphoric acid, regulators 32 and 33 of secondary air consumption and phosphoric acid, blocks 34 and 35 for input of reference and current information, computing unit 36, meter 37 for discharge in the pipeline 1C) 1x gases, controller 38 for fuel consumption and meter 39 for phosphoric acid .

The method is carried out as follows.

 The pipeline 1 to the nozzle 2 BGS 3 flows the pulp to the races

five

0

five

0

five

0

five

0

five

drinking; pipeline 8 receives total compressed air to pulp spraying, which is further divided into transverse compressed air through pipeline 13 and longitudinal compressed air through pipeline 11, through pipe 16 to nozzle 2 receives strong phosphoric acid, through pipe 19 to the furnace 18 secondary air flows for dilution, the pipeline 21 in the furnace 18 receives fuel for combustion; A conduit 23 from the BGS 3 receives the flue gas generated in the furnace 18. Pipeline 25 leaves BGS 3 for off-gas, and pipeline 27 is the product.

The signal from the meter 6 flow 1tulpa enters the input of the controller 28, the output signal from which is fed to the valve 7 supplying the pulp-1 to the nozzle 2 BGS 3. The signals from the meters 6 and 9, respectively, the flow rate of the pulp to the nozzle 2 BGS 3 and longitudinal compressed air - blunt T at the input of the regulator 29, the output signal from which is fed to the valve 10 of the flow of longitudinal compressed air at the entrance to the nozzle 2.

The signal from the meter 24 of the flue gas temperature at the inlet to the AAH 3 is fed to the input of the controller 32, the output signal from which is fed to the secondary air supply valve 20 for dilution into the furnace 18.

The signal from the meter 26 of the temperature of the exhaust gas after BGS enters the input of the controller 38, the output signal from which is fed to the valve 22 of the fuel supply to the furnace 18.

The signal from the meter 31 consumption of phosphoric acid is fed to the input of the controller 33.

The signals from the meters 4,5,6,15, 12, 14., 30, 39,37 and 24. The parameters of the state of the control object, respectively, were (W,), temperature (T), flow rate (Cp) of the pulp per injector 2 BGS 3, total compressed air consumption (QcR) for expansion of pulp, pressure of longitudinal (Peg) and transverse () compressed air, accuracy (Pqj) and temperature (t%) of phosphoric acid, dilution (DR) before HEH 3, flue gas temperature (T), as well as

calculated at the stage of ammonization, the degree of neutralization of the pulp at the nozzle entrance (t) is fed to the input of block 35, the output signal of which is fed to the input of the computing unit 36.

The reference information in the form of constant coefficients, included in the mathematical model of the process, is fed to another input of the computing unit 36 from the block 34.

In the computing unit 35, the optimum degree of pulp neutralization at the nozzle output () is determined, satisfying the following criterion

/ m (O - min

under restrictions:

q (t) (h „l) and“ ks-,

ChKR) Chkr q; (t) 6 (q,}. „ks;

where) is the average volume of product granules calculated by the model;

V is the specified volume of product granules for finished products;

qj (t) and q (t) are the fractions of granules of small and large fractions at time t, calculated by the model;

(and (the maximum limit of the share of the granule-fine and coarse fractions on the finished product).

The mathematical model of the process in an unclear form can be expressed by the following equations.

. "F

V (t) {, (Q ,, T ,, AP. ", B, Pcg.Pce, TT, mb) i Mx (t) -, LR. (3.6, P, t, P / v, TT, IIP

(t) -f3 (QH, .Qcg.Pcl PofeJT,): (t) fts (Qn, Tn, AP, 0.6, P, | .P / g, Tt.).

The setting of a phosphoric acid consumption regulator 33 is determined by

in computing block 36 by the equation

e1)

thirty

Q.-15 (Cc

Q,

 ,,)

a - f

(,, 6X1 / 6L1X 6c,

(1-W) f, 38 (f S -tTi "b0.2Uh.) -T, i, ()

20 where С (,, С ,, GI, Сз - coefficients set by block 34;

 - concentration of impurities in phosphoric acid.

The output signal from the computing unit 36, which corresponds to the specified value of phosphoric acid to the nozzle, is fed to the input of the regulator 33 as a reference.

The output signal from the controller 33 is fed to the valve 17 flow phos-. fororic acid on the injector 2 and leads the current consumption of phosphoric acid in accordance with the task.

Using the proposed control method allows to increase the total output of finished products.

by 7% and the production of products with a quality mark of 5%.

Editor H4Kisttulinets

Compiled by G. Ogadanov

Tehred S. Migunova Corrector I. Erdeyi

Order 851/33 Circulation 420 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Branch GOSH Patent, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR MANAGING THE PROCESS OF PRODUCING MINERAL FERTILIZERS BY LAYER-SPARKING OF ACID AND ALKALINE PULSE COMPONENTS by stabilizing the pulp consumption at the inlet to the nozzle of the granulator-dryer, the temperature of the exhaust gases at the outlet of the granulator-dryer, the effect on the flow rate of the fuel in the flue gas to the furnace; to the furnace, the ratio of the Pulp flow rate and the longitudinal compressed air to the nozzle of the granulator-dryer, the impact on the flow rate of longitudinal compressed air and flow control and phosphoric acid into the nozzle of the granulator dryer, characterized in that, in order to increase the yield of finished products and improve their quality, they additionally measure the pressure of transverse and longitudinal compressed air, the temperature and humidity of the pulp, the vacuum in the flue gas pipeline, temperature and density »Phosphoric acid and the concentration of impurities in it, the flow rate of total compressed air and the degree of neutralization of the pulp at the inlet to the nozzle of the granulator granulator, according to the measured values of the flow rate of pulp and total compressed air, the temperature of the pulp and flue gases, the pressure of transverse and longitudinal compressed air, the degree of neutralization of the pulp at the inlet to the nozzle and the vacuum in the line of flue gases determine the optimal degree of neutralization of the pulp at the outlet of the nozzle and regulate the flow of phosphoric acid into the nozzle of the granulator dryer depending on the optimal degree of neutralization pulp at the nozzle exit, the degree of neutralization of the pulp at the nozzle inlet, moisture and pulp consumption, temperature and density of phosphoric acid and impurity concentration in n her.