SU820884A1 - Method and apparatus for controlling dust preparation process in dust systems with ball-drum mills - Google Patents

Description

Niii is maintained by the constant gfn change of grinding gables 21.

The purpose of the invention is to increase the efficiency of the mill.

This is achieved by the fact that in the method of controlling the dust preparation process in dust systems with ball-type drum mills, including stabilizing the dust head mixture and ball loading, changing the supply of the initial power depending on the measured current productivity of the mill and its set value and stabilizing the grinding fineness by changing the position of the separation line from measured measuring fineness of solid topIiva taking into account the measured consumption of gas-phase fuel, its calorific value and calorific value of tva when the feed source changes depending on the measured current productivity of the mill and its predetermined value, the predetermined value of the mill productivity is adjusted depending on the solid fuel milling, and with an increase in the fineness of the solid fuel, the mill by reducing the fineness of grinding, the preset value of the mills is reduced.;.

In addition, control of the dust preparation process in dust systems with ball drum mills, including a sensor for fine grinding of solid fuel, controllers for ball loading, speed of dust / air mixture, mill productivity and fine grinding of solid fuel, sensors for gaseous fuel consumption, calorific content of gas and calfium solid fuel. The Leaves, connected via the {1st QIOK grinding setting, to the setting unit, adjusting the fineness of solid fuels. a, additionally contain the setting knob of the performance regulator and the mill, the mill setting, specify the output of the grinding mill, and the output to the setting point of the mill performance regulator. The essence of the invention is as follows.

As a criterion for evaluating the effectiveness of the dust preparation process, an indicator is taken - the sum of reduced heat loss per 1 kg of solid fuel burned. This amount contains

losses from mechanical underburning of solid fuel, heat losses equivalent to the electric power consumption for grinding and pneumatic transport of fuel, heat losses equivalent to stoic, awnings of the metal being worn out of balls, and heat loss equivalent to depreciation costs.

The optimum mode of operation of the dust system is such a mode, with cotsrom the amount of heat loss will be minimal. Thermal power plants of metallurgical plants, the main fuel is solid fuel-industrial product sinter refinery and gas phase - blast furnace gas or coke oven gas. At the same time, the supply of gaseous fuel varies in large limits depending on the operating modes of the metallurgical production units.

Under these conditions, losses from mechanical underburning depend not only on solid fuel consumption and the fineness of its grinding, but also on gas-phase fuel consumption — blast furnace gas or xerox gas. Mechanical underexposure depends on the time and prejudice to the coal of dust in the furnace and the speed of burnout of dust particles. When using coke oven gas, whose caloric value is higher than the calorific value of pulverized fuel, the temperature of the flare increases, which contributes to an increase in burnout rate.

Therefore, along with the stabilization of the velocity of the dust-air mixture, the ball load and the adjustment of the productivity of the mill, it is necessary to stabilize the fineness of the help taking into account the consumption of gaseous fuel, its calorific value and the caloric content of solid fuel. With an increase in the amount of coke gas coming in, it is necessary to increase the grinding fineness of hard fuel, i.e. apply for burning larger particles of smaller fuel ..

In the case of using blast furnace gas, whose calorific value is lower than the caloric content of solid fuel, the temperature of the torch decreases, which reduces the rate of high dust particles. At the same time, with an increase in the amount of incoming gas, it is necessary to reduce the grinding of solid fuel in order to ensure its efficient combustion.

Claims (2)

However, when changing the fineness of solid fuel milling, it is necessary to change the specified value of the grinding ability of the mill in order to fully use its paa fiber capacity, i.e. Maintain consistent maximum productivity. For this, with an increase in the milling of tons of solid fuel, it is necessary to increase the productivity of the mill, and with a decrease in the grinding fineness, it is necessary to decrease the productivity of the mill. The invention is illustrated in the drawing, which shows the structures in the device diagram that implements the method. management team The device comprises a bunker 1 coal feeder 2, a regulating authority 3 of the power supply, an electric motor 4 of the power supply, a steam drum mill 5, an electric motor 6 of the mill, a separator 7, an electric motor 8 controlling the position of the cusps of the separator, cyclo 9, the bunker 1O of the pulverized fuel, the mill valve tsr 11, sharozagor 12, electric motor 13 of the charger, the sensor 14 of the performance of the mill, the setting device 15 of the regulator of the performance of the mill, the controller 16. mill performance, correction block 17, mill performance, ball loading sensor 18, milling station, 19 ball spacing controller, sensor 2O of the dust-air speed, air speed regulator 21, the air-dust mixture, recirculation gate 22, electric motor 23, controlling the position of the recirculation gate, sensor 24 fineness of grinding, solid fuel, regulator 25 tons of grinding, unit 26 regulator of fine tonnage, sensor 27 consumption of gaseous fuel, sensor 28 calorific value of gaseous fuel, sensor 29 caloric content of solid pliva, krrekrukladiy block AOR setting the fineness of grinding solid fuel. The parameters are stabilized, INFLUENCED: on the grinding fineness, carried out by the regulators 19 and 21 of the ball load and the speed of the dust-air mixture. The mill loading ball regulator receives the signal from the current sensor 18 of the electric motor 6 of the mill 5 and acts on the electric motor 13, which controls the sharadozato () OM 12. The speed regulator of the dust-air mixture perceives the signal from the speed sensor 20 and acts on the electric motor 23, the control the position of the recirculation damper 22. The regulator 25 of the tonne of grinding of solid fuel receives the signal from the sensor 24 of the fineness of grinding and acts on the electric motor 8, which controls the position of the flaps of the separator 7. The signals from the flow sensor 27 azoobraznogo- fuel E8 and 29 gazoobraz1gogo caloric fuel and solid fuel sensor enters bp correcting device 30 which zadatnik through 26 assignment changes the regulator chomopa fineness. Regulus gf 16 proizvo-. The duration of the K1 mill receives the signal from the sensor 14 of the mill performance and acts on the electric motor 4, which controls the regulator 3 of the feeder 2. The signal from the gauge 24 goes to a correction device 17, which through the setpoint 15 changes the setting of the mill regulator. The device works as follows. With a constant steam generator performance and a constant amount of gaseous fuel supply of one type, the controller 25 supports the grinding fineness in accordance with the task set by the grinding finisher regulator 26. The controller 16,19 and 21 maintains the mill performance, ball loading and speed of dust and air mixtures are constant according to the assignment. When using gaseous fuel with a calorific value greater than the caloric content of solid fuels, such as coke oven gas, with an increase in the amount of gas-phase fuel entering the combustion, the correction unit of the SO develops a signal to increase the setting of the fineness regulator setting of solid fuel 25. With increasing fineness of solid fuel, the corrective unit 17 outputs a signal to increase the job of the mill capacity controller. With a decrease in the amount of incoming gaseous fuel of this type, a signal is produced to reduce the grinding fineness and decrease the productivity of the mill. If the caloric content of the gaseous fuel used is less than the caloric content of the solid fuel, for example, blast furnace gas is used, then with an increase in the amount of incoming gaseous fuel, the correction unit 30 gives a signal to reduce the setting of the grinding fineness regulator. When the grinding fineness decreases, the correction unit 17 eliminates the signal to reduce the setting of the mill performance. When reducing the amount of incoming gaseous fuel of this type, a correction signal is sent to the setpoint regulator for grinding the gill to increase the grinding core of solid fuel and, accordingly, a correction signal is generated to the setting control unit of the mill performance controller to increase productivity K (mill. Invention 1, Method of process control dusting in dust systems with ball drum mills, including the stabilization of the velocity of the dust-air mixture and the ball load, change in the supply of the initial power depending on the measured current productivity of the mill and its specified value and regulation of the grinding fineness by changing the position of the separator of the separator depending on the measured grinding fineness of the solid grpliva, taking into account the measured gas phase fuel, its caloric value of the solid fuel, different from that , that, with a chain of increase in the efficiency of the mill, and the principle of the “supply of feeds and feeds” depending on the measurement of current production rates and its predetermined value, corrects for a given value of the melon production capacity depending on the tsiyins of grinding solid fuel, and with an increase in the grinding cores of solid fuel, they release the set value of the mill productivity, and with decreasing grinding fineness they decrease the set value of the mill productivity. 2, A device for carrying out the method according to claim 1, comprising a sensor for grinding solid fuel, a ball valve regulator, loading, speed of a mixture of air, mill performance and tons of solid fuel grinding, gaseous fuel consumption sensors, gas gaseous calorific value and solid fuel connected through the corrective fading of the setting of the grinding fineness To the setting adjuster of the grinding fineness of solid fuel, characterized in that, in order to increase the efficiency of the mill, the device contains the setting adjuster the mill productivity regulator and the adjustment unit of the mill performance setting, the input of which is connected to the tsiniy sensor of solid fuel, and the output to the unit of the mill performance regulator. Source 1g of information taken into account in the examination 1.Patent of the GDR No. 56432, cl. 50 C 19 / ZO, 1961. 2.AAvsrskoe certificate of the USSR for application NO 2449915/33, cl. In O2 C 25 / OO, 1977 (prototype).