SU1154511A1 - Method of automatic control of boiler group with common steam drum - Google Patents

Abstract

THE AUTOMATIC REGULATION METHOD OF THE BOILER GROUP WITH A GENERAL STEAM COLLECTOR by determining the upper and lower limits of their steam capacity, vacuum pressure, fuel, air and water consumption of each boiler and using them as limiting parameters, measuring the steam pressure in the collector, steam capacity of each boiler and comparing the steam pressure in the collector, steam capacity of each boiler and comparing them, comparing steam pressure in the collector, steam capacity of each boiler and comparing them to compare. value, determine the efficiency of each boiler from the steam output and the steepness of both branches of these dependencies and when reaching any limiting parameters One of the limits, switching the regulating effect to the other boiler depending on the efficiency slope, and when the steam output changes in the direction of the maximum value - to the boiler that has the greatest slope of this dependence, and when the steam output decreases, to the lowest slope boiler, where , in order to increase the efficiency of using fuel of different value if it is necessary to increase steam consumption through a steam collector, increase the fuel supply first to the boiler groups that burn the least expensive fuel, and when reducing consumption, reduce the supply of fuel to the group’s boiler, burning the most valuable fuel, and if there are several boilers in the group working on the same fuel, increase (decrease) the supply of fuel to the boiler op from the maximum (minimum ) Krutiz4 SD1 Noah efficiency depending on steam production.

Description

The invention relates to the field of automation of thermal electric machines with boilers operating on a common steam manifold and burning several types of fuels of various values.

The aim of the invention is to increase the economics of using fuel of different value if it is necessary to increase steam consumption through a steam manifold.

The drawing shows a block diagram of a device that implements the proposed method.

Boilers 1,2, ..., and work on a common steam manifold 3, to which consumers of 4 pairs are connected. The regulation system contains individual heat load regulators 5, motor setting knobs 6 heat load regulators, regulator switching blocks 7, main regulator 8, analog-discrete device 9, fuel priority block 10 (fuel priority is set from the outside), regulators 11-13, the fuel supply unit, the priority efficiency unit 14 (the K1SC priority is set from the outside).

The method is carried out as follows.

The signal of the main controller 8 to increase (decrease) performance is fed to the analog-discrete device 9, which selects a group of boilers whose technological parameters have not reached the maximum (minimum) limits, and together with block 10 of fuel priorities increase the fuel supply first to the boiler (group boilers burning the least valuable fuel.

and while reducing steam consumption, reduce fuel intake. boiler (group of boilers), burning the most valuable fuel.

If one of the boilers is selected by block 10 of fuel priorities, the signal of the main regulator B is switched to the motor setting unit 6

- selected boiler. If a group of boilers is selected, then from it the analog-discrete device 9 together with the block 14 of priorities for efficiency chooses the boiler with the greatest slope when the performance changes towards the maximum and the boiler with the lowest slope when the performance changes from the maximum, while the main control signal The torus 8 is switched to the engine master 6 of the selected boiler.

Fuel priorities are set by the operator manually, depending on the types of fuel burned, fuel limits and the need for buffer fuel consumption. For example, for thermal power plants of the iron and steel industry, burning blast-furnace, coke-oven, natural gases and imported solid fuels, the fuel priority may look like this: natural gas, solid fuel, coke-oven gas, blast-furnace gas (in the direction of value reduction).

 As a result of using the proposed method, the possibilities of a thermal power plant as a buffer consumer will be more fully utilized, which will lead to a decrease in the amount of buffer fuel burned in the atmosphere, and the consumption of natural gas and other valuable fuels will also be reduced.

Claims (1)

METHOD FOR AUTOMATIC REGULATION OF A BOILER GROUP WITH A GENERAL STEAM COLLECTOR by determining the upper and lower limits of their steam capacity, vacuum, fuel, air and water consumption of each boiler and using them as limiting parameters, measuring the vapor pressure in the collector, the steam capacity of each boiler and comparing it with the optimal value, determining the efficiency of each boiler from steam production and steepness of both branches of these dependencies and when any limiting parameters are reached one of the limits, switching the regulatory action to another boiler depending on the steepness of the efficiency, moreover, when the steam capacity changes in the direction of the maximum value, to the boiler having the greatest steepness of this dependence, and when the steam capacity decreases, to the boiler with the smallest steepness, characterized in that, in order to increase the efficiency of using fuel of various values if necessary, increase the flow rate of steam through the steam manifold, _ increase the fuel supply first to the boiler of the group, 55 burning the least valuable fuel, and with a decrease in consumption · steam reduces the fuel supply to the boiler of the group burning the most valuable fuel, and if there are several boilers in the group operating on the same fuel, increase (decrease) the fuel supply to the boiler with the maximum (minimum) slope dependence of efficiency on steam production. . „1154511