SU974043A1

SU974043A1 - Apparatus for controlling total air consumption in boiler

Info

Publication number: SU974043A1
Application number: SU813293223A
Authority: SU
Inventors: Валентин Кириллович Богданов; Натан Владимирович Кваша; Игорь Борисович Малютин
Original assignee: Предприятие П/Я А-3513
Priority date: 1981-05-20
Filing date: 1981-05-20
Publication date: 1982-11-15

Description

Изобретение относитс к теплоэнергетике и может быть использовано при регулировании расхода общего воздуха котла при одновременном сжигании двух видов топлива.The invention relates to a power system and can be used to regulate the total air flow of a boiler while simultaneously burning two types of fuel.

Известно устройство дл регулировани расхода общего воздуха котла, сжигающего два вида топлива, содержащее датчики расхода топлив, подсоединенные к сумматору, выход которого св зан с блоком делени , подключенным к регул тору CllA device for controlling the flow of total air of a boiler that burns two types of fuel is known, comprising fuel flow sensors connected to an adder, the output of which is connected to a dividing unit connected to a Cll regulator.

Недостатком этого устройства вл етс то, что оно формирует задающий сигнал, пропорциональный доле одного вида топлива в общем количестве топлива (соотнесению расходов двух видов топлива), не учитыва нелинейный характер зависимости между требуемым расходом воздуха и расходом топлива, что снижает точность.A disadvantage of this device is that it generates a driving signal proportional to the proportion of one type of fuel in the total amount of fuel (correlating the costs of two types of fuel) without taking into account the non-linear nature of the relationship between the required air flow and fuel consumption, which reduces accuracy.

Цель изобретени - повышение точности .The purpose of the invention is to improve accuracy.

Поставленна цель достигаетс тем, что задатчик содержит дополнительно второй сумматор, св занный с двум блоками умножени , каждый из которых снабжен своим функциональным преобразователем, при этом входы каждого блока умножени и егоThe goal is achieved by the fact that the master control unit additionally contains a second adder connected to two multiplication units, each of which is equipped with its own functional converter, and the inputs of each multiplication unit and its

функционального .преобразовател соединены со своим датчиком.a functional converter is connected to its sensor.

На чертеже представлена схема автоматического задатчика.The drawing shows a diagram of the automatic setting device.

Автоматический задатчик регул тора расхода общего воздуха содержит блок делени 1, на первый вход которого подключен сумматор 2, на входы которого подключены датчик 3 рас10 хода первого вида топлива и датчик 4 расхода второго вида топлива, на второй вход блока делени подключен сумматор 5, на входы которого подключены два блока умножени б и 7, The automatic setting knob of the total air flow regulator contains a dividing unit 1, to the first input of which an adder 2 is connected, to the inputs of which a sensor 3 for the first type of fuel is connected and a sensor 4 for the second type of fuel; which are connected two blocks of multiplication b and 7,

15 на первые входы которых подключены выходы функциональных преобразователей 8 и 9 соответственно, на второй вход блока умножени 6 и на вход блока нелинейности 8 подключен дат20 чик 3 расхода первого вида топлива, на второй вход блока умножени 7 и на вход преобразовател 9 подключен датчик 4 расхода второго вида топлива .15 to the first inputs of which are connected the outputs of functional converters 8 and 9, respectively, to the second input of multiplication unit 6 and to the input of nonlinearity unit 8, a sensor 20 for the flow rate of the first type of fuel is connected, to the second input of multiplication unit 7 and to the input of converter 9, flow sensor 4 second type of fuel.

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Устройство работает следующим образ ом,The device works as follows,

Claims

Functional converters 8 and 9, receiving input signals for fuel consumption of the first type G and signal for fuel consumption of the second type C, respectively, form output signals and (P-count free oxygen in flue gas, respectively, at fuel consumption C and multiplication blocks and 7, receiving signals at the inputs, respectively, pairs G, Gi, O 2 //, form output signals C and P 0 -i-if; adder 2, receiving signals C and G at the input, generates output signal / G + adder 5, receiving signals (j Ov / and G, forms the output with Needle / С;., / +, /; block 1, which receives signals from summers 2 and 5 at the input, generates a signal at the output: h + Oj / Gj / The fraction numerator is the output of adder 5, and the denominator is adder output

2. The received signal is the master signal to the total air flow controller, which depends nonlinearly on the cost ratio of the two types of fuel. When the ratio between the consumption of two types of fuel and the unchanged total fuel consumption changes, the change in the ratio of types of fuel and the total amount of fuel changes, the signal from dividing unit 1 generally changes. When reducing the consumption of one type of fuel to zero, the signal at the output of the fission unit is determined by the functional conversion of bodies 8 or 9 according to the consumption of the type of fuel burned. With the subsequent introduction of this signal into the regulator of the total air flow rate, the air flow rate is changed so that the oxygen content in the flue gases required by the conditions of the efficiency of the combustion process is established. Thus, the proposed device automatically determines the excess air required while simultaneously burning two types of fuel, non-linearly dependent on their cost ratio. Apparatus of the Invention A device for controlling the total air flow rate of a boiler burning two types of fuel, comprising fuel consumption sensors connected to a summator, the output of which is connected to a dividing unit connected to a regulator, characterized in that, in order to improve accuracy, it contains the second summator is associated with two multiplication units, each of which is equipped with a functional converter, with the inputs of each multiplication unit and its functional converter connected to its sensor. Sources of Information Accepted in 7-Note in Expert Examination 1. Technical report on improving the automation of power plants with units of 200-300 MW. vti. Teploelektroproekt. USSR Ministry of Energy, M., 1971, Vol. 7, drawing 797-K (common air regulator).