SU1442532A1 - Apparatus for automatic control of process duty of coke dry quenching plant - Google Patents

Abstract

The invention relates to a coke industry, in particular to devices for monitoring and controlling the operation of coke dry quenching plants. The aim of the invention is to increase the efficiency of the technological mode of operation of the plant by reducing heat loss. The device contains a unit for measuring the number of coke loads; two measurement units for CO content and two content units for CO-g. respectively, at the inlet and in the code of the extinguishing chamber -, the unit measuring the pressure drop on the exhauster; a hot coke temperature measuring unit in the zone of oblique excursions of the quenching chamber; two units for measuring the temperature of the circulating gas, respectively, at the inlet and outlet of the quenching chamber; j, the unit for measuring the flow rate of produced steam, the vapor temperature unit; feedwater metering unit; ambient temperature measurement unit} feedwater temperature measurement unit; elements of the task of constants; a unit for calculating the amount of heat of the hot coke, taking into account its intoxication; two units for calculating the amount of heat of the circulating gas, respectively, at the entrance and code of the extinguishing chamber; two blocks for calculating the amount of heat generated by steam and feedwater; units for calculating the exergic temperatures of the hot coke, the circulating gas at the inlet and decoder of the quenching chamber, the generated steam at the outlet of the recovery boiler and the temperature of the feed water; The units for calculating the exergy of hot coke fluxes, taking into account its burnout, circulating gas at the inlet and outlet of the quenching chamber, abrasive steam and water supply, are the units for calculating the exergy efficiency of the quenching chamber, the installation as a whole and the boiler | Utilizer. 1 il. (C (L 4 O1

Description

This invention relates to a coke industry, in particular, to devices for monitoring and controlling the operation of dry coconut quenching plants (CAFC).

The purpose of the invention is to increase the efficiency of the technological mode of operation of the plant by reducing heat loss.

The drawing shows a block diagram of the device for automatic control of the technological mode of the dry extinguishing plant.

The device contains a unit 1 for measuring the number of coke loadings of the quenching chamber (not shown), blocks 2 and 3 of measuring the CO content, and blocks 4 and 5 of the content of CO, respectively, at the inlet and outlet of the quenching chamber, block 6 for measuring the pressure drop on the exhauster (not shown), unit 7 for measuring the temperature of hot coke in the zone of slanting extinguishing chamber chambers, blocks 8 and 9 for measuring the temperature of the circulating gas respectively at the outlet and inlet of the quenching chamber, unit 10 for measuring the flow of superheated steam, unit 11 for superheated steam temperature feedwater flow measurement unit 12, ambient temperature measurement unit 13, unit. 14 measuring the feed water temperature, elements 15–27 of the assignment of constants, which allow to take into account a number of constant coefficients, while the outputs of blocks 1–7 are connected to the corresponding inputs of block 28 for calculating the amount of heat of hot coke, taking into account its carbon loss, which includes elements 15-21, the output of block 6 is also connected to the corresponding inputs of blocks 29 and 30 for calculating the amount of heat, the circulating gas, respectively, at the entrance and entrance of the dam chamber, which include elements 22 and 23, respectively, and element 21 block 28 with dinene and with the corresponding inputs of blocks 29 and 30, the output of block 8 is connected to the corresponding input of block 29, and the output of block 9 is connected to the input of block 30, the outputs of blocks 10 and 11 are connected to the corresponding inputs of block 31 for calculating the amount of heat produced by steam, which the elements 24 and 25 are included, the outputs of the blocks 12 and 14 are connected to the corresponding inputs of the block 32

calculating the amount of heat supply water, which includes elements 26 and 27, the output of block 13, is connected to the first inputs of the blocks

33-37 calculations of exergic temperatures, respectively, of hot coke, circulating gas at the exit and inlet of the quenching chamber, produced steam at the outlet of the waste-heat boiler (not shown), feed water, the second inputs of which are connected respectively to the codes of blocks 7- 9, 11 and 14, the outputs of blocks 28-32 are connected

f5 with the first inputs of the corresponding

blocks 38-42 for calculating the exergy of fluxes, respectively, of hot coke, circulating gas at the code and the inlet of the quenching chamber, 20 steam produced, feed water, the second inputs of which are connected to the outputs of the corresponding blocks 33-37, the first code 38, is connected to the first input, exergy calculation unit 43

5 The efficiency of the quenching chamber, the second output is connected to the first input of the calculator 44 of the exergic efficiency of the installation as a whole, the first output of the block 39 is connected to the second input of the block 43, 2Q the second output is connected to the first input of the calculator 45 of the exergic heat recovery CODE, the output of the 40 block connected to the third input of the block 43, the first output of the block 41 is connected to the second input of the block 44, the second output is connected to the second input of the block 45, the first output of the block 42 is connected to the third input of the block 44, the second output is connected to the third input of the block 45.

The device works as follows.

The outputs of blocks 1-14 remove signals proportional to the current values of the measured parameters: the number of coke loadings of the quenching chamber, the CO and CO contents at the inlet and outlet of the quenching chamber, the pressure drop at the exhaust fan, the temperatures of hot coke, the circulating gas at the outlet and the inlet of the quenching chamber, the flow of superheated steam, its temperature, the flow rate of feed water, the temperature of the environment and feed water. 55 Signals entering block 28

converted into an output signal proportional to the amount of heat Q entering the quenching chamber with expansion

40

45

50

hardened coke, and the amount of heat Q released during its intoxication:

5V

 QK

(one)

or

- R,

where n

ten

ki

 n.k, -C ,, t ,, + U, ki (P, -, ..) (k, .acf, | k,.) h q ,,

. - hourly loadings of coke into the quenching chamber, 1 / h;

- weight of coke in the steaming car, kg-,

c is the heat capacity of hot coke, kJ / kg deg .;

- hot coke temperature, ° Ci

- circulating gas consumption coefficient, 20 m h-Pa;

- coefficient taking into account the content of pure carbon in coke;

t is the temperature of the circulating gas at the inlet of the Tusheni chamber, C.

The signals entering block 31 are converted into an output signal proportional to the amount of heat Q PP in the superheated steam:

 Pp

-PP)

(five)

where g

PP

15

PP

superheated steam consumption, kg / h;

enthalpy of superheated steam, kJ / kg. At operating temperatures of 350-490 C and operating pressures of 3.1392-3.3316 MPa, vapor enthalpy with an accuracy sufficient for calculations is approximated by a linear dependence

Pp

A + B-t,

(6)

P and P - circulation pressure - 25 D A and B - constant coefficients.

where C is the heat capacity of the circulating gas at the inlet of the quenching chamber, kJ / m - Ci

t is the temperature of the circulating gas at the inlet of the quenching chamber, C.

The signals entering block 31 are converted into an output signal proportional to the amount of heat Q PP in the superheated steam:

 Pp

-PP)

(five)

where g

PP

PP

superheated steam consumption, kg / h;

enthalpy of superheated steam, kJ / kg. In the range of operating temperatures of 350-490 C and operating pressures of 3.1392-3.3316 MPa, vapor enthalpy with an accuracy sufficient for calculations is approximated by a linear dependence

Pp

A + B-t,

(6)

go gas before and after the exhaust fan, respectively, Pa;

k, kj are the coefficients characterizing the yield of COa and CO when carbon is burned, respectively;

&, respectively, the increment of CO 2 and CO in the circulating gas after the quenching chamber due to coke burnout,%

q is the calorific value of coke, kJ / kg.

The signals received in block 29 are converted into an output signal proportional to the amount of heat Q | circulating gas at the outlet of the quenching chamber:

CANCER ki (P, - Pj), (3)

where Cdc is the heat capacity of the circulating gas after the quenching chamber, QJ / M - C;

circulating gas temperature 50 after the extinguishing chamber,

° s

The incoming signals to block 30 are converted into an output signal proportional to the amount of heat of the circulating gas at the inlet of the quenching chamber.

QAH k (Pi - PI) -CAH ()

Then

: pn

 With „„ (A B-tnn). (7)

0

five

0

The signals entering block 32 are converted into an output signal proportional to the amount of heat Q pv of feedwater:

(eight)

Q П8 6 1- PV

where G r, g - feedwater flow,

Kr / 4i

in ,, - enthalpy nutrient

dy, kJ / kg Grad. In the range of operating temperatures of 90-120 ° C and operating pressures of 1.471-1.667 MPa, the enthalpy of feedwater is approximated with sufficient accuracy for calculations by linear dependence

lv

C + D

P6

(9)

where C and D are constant coefficients. Then

 - (C + D-tp,). (ten)

P8

Signals coming from blocks 33-37 from blocks 7-9-, 11 and 14, proportional to the temperature of heat fluxes, are converted into corresponding output signals proportional to the exergic temperatures of the corresponding heat flux by the formula

Thats

T, 1 mm

(eleven)

T.

where TD is the ambient temperature, Ki

teracoratura coi, corresponding heat flux, Kj heat flux index, respectively, gk - hot KOKCJ dk and dn - circulating gas respectively at the outlet and out of the chamber pp pp - vfabatyuymy (superheated) vapor} pv - feed water.

Signals from blocks 28-32, supplied to blocks 38-42, proportional to the amount of heat of the corresponding heat flux Q., and signals from blocks 33-37, proportional to the exothermic temperature T of these heat fluxes, are converted into signals proportional to the exergy of the corresponding heat fluxes :

E. Q. T .. (12)

Signals entering block 43 are proportional to the exergy values of the corresponding heat fluxes.

(E

to

 AK

U) are converted to

signal proportional to the exergy-1 efficiency of the extinguishing chamber:

E AK - ELN

E

-100%

1x

(13)

Where

E,

(14)

k - rk - - UHP signals entering block 44, proportional to the values of exergy corresponding to heat fluxes

 pp

E ...) are converted to

(E

The signal S is proportional to the magnitude of the exergic efficiency of the whole CDCP as a whole:

E

- E

P6

100%

(15)

 -Sk

Signals entering block 45 are proportional to the exergy values of the corresponding heat fluxes.

 Ak

 pp

E „.), Converted to sigCE ...

cash proportional to the exergy efficiency coefficient of the recovery boiler:

kpp

  -. -100%, (16)

 AK

The proposed device for automatic control of the technological mode of the dry quenching plant,

five

five

It can be implemented both on devices of the current branch of the GPS system, and on a computer in combination with appropriate measuring instruments, sensors, and converters.

For the implementation of the computational operations necessary for calculating the functions on expressions (1) - (16), the simplest computational operations are used: summation, multiplication and division.

Claims (1)

Invention Formula A device for automatic control of the coke dry quenching plant, containing a block for calculating the amount of heat 0 of hot coke, the first to seventh inputs of which are connected to the outputs of measuring blocks of carbon monoxide content in the circulating gas at the inlet and outlet of the quenching chamber, measuring blocks of carbon dioxide content in the circulating gas at the inlet and outlet of the extinguishing chamber, the units measuring the pressure drop at the exhauster and the temperature of the hot coke, and the eighth - and the fifteen inlets are connected to the outlet The first to the seventh elements of the task of setting constants, a unit for calculating the amount of heat of the circulating gas at the outlet of the quenching chamber, the first and second inputs of which are connected to the outputs of the measuring units for differential pressure on the exhauster and the temperature of the circulating, gas at the exit of the extinguishing chamber, and the third and fourth inputs connected to the outputs of the seventh and eighth elements of the specification of constants, as well as a unit for calculating the amount of heat produced by the steam, the first and second inputs of which are connected to the outputs of the flow measurement units and the rate The third and fourth inputs are connected to the outputs of the ninth and tenth elements of the task of constants, characterized in that, in order to increase the efficiency of the technological mode of operation of the installation by reducing heat loss, it additionally introduces blocks for measuring ambient temperatures and feedwater as well as feedwater consumption, units for calculating the amount of heat in the inlet gas 0 five 0 five 0 five quenching chambers and feedwater, units for calculating exergic temperatures and exergies of streams of hot coke, circulating gas At the inlet and outlet of the quenching chamber, steam produced, feedwater, calculating units of exergy efficiency of the quenching chamber, recovery boiler and chamber as a whole, blocks measure the flow and temperature of the steam and feed water produced, the ambient temperature, the eleventh, twelfth and thirteen elements of the task of the constants, with the first - the fourth inputs of the calculating unit The gas heat at the inlet of the quenching chamber is connected to the outputs of the measuring units for measuring the differential pressure at the exhauster and circulating gas temperature at the inlets of the quenching chamber, as well as for the outputs of the seventh and eleventh constant setting elements, the first and fourth inputs of the unit for calculating the amount of feed water are connected to outputs, respectively, of units for measuring the flow and temperature of feed water, as well as for the twelfth and thirteenth elements of specifying constants; output of a unit for measuring the temperature of hot coke Connected to the first inlet of the exergy temperature calculation unit of hot coke, the second inlet of which is connected to the first inlets of the exergic circulating gas temperatures inlet and outlet of the quenching chamber, steam at the outlet of the heat recovery boiler, feedwater and outlet of the temperature measuring unit environment, the second inputs of the units for calculating exergic circulating gas temperatures at the inlet and outlet of the quenching chamber, units for calculating exergic temperatures of steam at the output I of the waste-heat boiler ra and feeder five 0 five five 0 five The water is connected to the outputs of the measuring units for measuring the temperature of the circulating gas at the inlet and outlet of the chamber for extinguishing the temperature of the produced steam and feedwater, the first and second inputs for the calculators of exergies of hot coke streams, the circulating gas for the inlet and outlet of the extinguishing chamber, and blocks for calculating the flows the energies of the produced steam and feedwater are connected to the outputs of the calculating units, respectively, the amount of heat of hot coke and the exergy temperature of hot coke, the calculating units the amount of heat of the circulating gas and its exergic temperature at the inlet and outlet of the extinguishing chamber, units for calculating the amount of heat produced by steam and feedwater, and units for calculating exergic temperatures of the produced vapor and feedwater, first, second and third inlets of the exergetic chamber for calculating extinguishing chamber are connected to the first outputs of the units for calculating the exergies of the hot coke flow, the excesses of the circulating gas flows at the inlet and outlet of the quenching chamber, first, second and third inlets The exergetic efficiency calculator of the waste-heat boiler is connected respectively to the second output of the circulatory gas flow exergy unit at the exit of the quenching chamber, with the first outputs of the exergy computing unit of the generated steam and feedwater, and the first, second and third inputs of the exergic efficiency calculator Generally, respectively, are connected to the second outputs of the calculator for the exergy of hot coke streams, the generated steam and the block for the calculation of the exergy of feed water, WITH