KR-102964947-B1 - Combustion equipment

KR102964947B1KR 102964947 B1KR102964947 B1KR 102964947B1KR-102964947-B1

Abstract

The ratio of fuel gas (G) supplied to the burner (20) and combustion air (Air) is adjusted by the air ratio control system (50), and when the fuel gas and combustion air are ejected from the burner into the furnace (10) to burn, the change in oxygen concentration inside the furnace due to the change in air entering the furnace is detected by the oxygen concentration sensor (51), and the oxygen concentration inside the furnace detected by the oxygen concentration sensor is output from the output control device to the air ratio control system, thereby adjusting the ratio of combustion air supplied to the burner and the fuel by the air ratio control system.

Inventors

사쿠베야 고지
가타야마 도모키
기타무라 도쿠카츠
다니야마 기미오

Assignees

쥬가이로 고교 가부시키가이샤

Dates

Publication Date: 20260513
Application Date: 20230621
Priority Date: 20220829

Claims (2)

In a combustion facility in which the ratio of fuel supplied through a fuel supply pipe and combustion air supplied through an air supply pipe is adjusted by an air-ratio control system and supplied to a burner, and combustion air and fuel are ejected from the burner into a furnace to burn, an oxygen concentration sensor is installed to detect a change in oxygen concentration inside the furnace according to a change in the amount of air entering the furnace, the oxygen concentration inside the furnace detected by the oxygen concentration sensor is output from an output control device to the air-ratio control system, and based on the oxygen concentration inside the furnace detected by the oxygen concentration sensor, the ratio of combustion air and fuel supplied to the burner is adjusted by the air-ratio control system, and when fuel and combustion air are burned inside the furnace, if the amount of combustion exhaust gas inside the furnace increases due to an increase in the amount of combustion in the burner, thereby increasing the pressure inside the furnace, and if the amount of air entering the furnace decreases, causing the oxygen concentration inside the furnace detected by the oxygen concentration sensor to decrease, then the ratio of combustion air and fuel supplied to the burner is adjusted by the air-ratio control system to increase the air ratio inside the burner, whereas, A combustion facility characterized by reducing the amount of combustion by the burner, thereby reducing the amount of combustion exhaust gas in the furnace, lowering the pressure in the furnace, increasing the amount of incoming air entering the furnace, and, when the oxygen concentration in the furnace detected by the oxygen concentration sensor increases, adjusting the ratio of combustion air supplied to the burner to fuel by the air-ratio control system to reduce the air-ratio in the burner.
In a combustion facility in which the ratio of fuel supplied through a fuel supply pipe and combustion air supplied through an air supply pipe is adjusted by an air-ratio control system and supplied to a burner, and combustion air and fuel are ejected from the burner into the furnace to burn, an oxygen concentration sensor is installed to detect a change in oxygen concentration inside the furnace according to a change in the amount of air entering the furnace, the oxygen concentration inside the furnace detected by the oxygen concentration sensor is output from an output control device to the air-ratio control system, and when the ratio of combustion air and fuel supplied to the burner is adjusted by the air-ratio control system based on the oxygen concentration inside the furnace detected by the oxygen concentration sensor, a plurality of burners are installed in the furnace, and each burner has a cooling air guide pipe installed on the outer circumference of a fuel supply nozzle that supplies fuel to guide cooling air, and at the same time, a combustion air supply nozzle that supplies combustion air is installed on the outer circumference of the cooling air guide pipe, and the number of burners whose combustion is stopped increases, and the amount of cooling air entering into the furnace from the cooling air guide pipe in the burners whose combustion is stopped increases, and the A combustion facility characterized by, when the oxygen concentration inside the furnace detected by the oxygen concentration sensor increases, adjusting the ratio of combustion air to fuel supplied to the burner where combustion is being carried out by the air ratio control system to reduce the air ratio inside the burner where combustion is being carried out, while decreasing the number of burners where combustion is stopped and reducing the amount of cooling air entering into the furnace from the cooling air guide pipe of the burner where combustion is stopped, and when the oxygen concentration inside the furnace detected by the oxygen concentration sensor decreases, adjusting the ratio of combustion air to fuel supplied to the burner where combustion is being carried out by the air ratio control system to increase the air ratio inside the burner where combustion is being carried out.

Description

Combustion equipment The present invention relates to a combustion facility in which the ratio of fuel supplied through a fuel supply pipe to combustion air supplied through an air supply pipe is adjusted by an air-ratio control system and supplied to a burner, and combustion air and fuel are ejected from the burner into a furnace to burn. In particular, the invention is characterized by the fact that, in cases where the amount of air entering the furnace changes due to a change in the amount of combustion in the burner and thus the oxygen concentration inside the furnace changes, or in cases where a plurality of burners are installed in a furnace in which a cooling air guide pipe is installed on the outer circumference of a fuel supply nozzle to guide cooling air and a combustion air supply nozzle is installed on the outer circumference of the cooling air guide pipe to guide combustion air, and the number of burners whose combustion is stopped changes and the amount of cooling air guided into the furnace from the cooling air guide pipe of the stopped burner changes, thereby changing the oxygen concentration inside the furnace, the ratio of combustion air supplied to the burner and fuel is rapidly adjusted by the air-ratio control system so that the air ratio inside the furnace becomes a predetermined value, thereby enabling stable combustion. Conventionally, in a combustion facility, fuel supplied through a fuel supply pipe and combustion air supplied through an air supply pipe are supplied to a burner in a predetermined ratio, and the fuel and combustion air are ejected from the burner into the furnace to be combusted. Here, when fuel and combustion air are injected from a burner into a furnace and combusted within the furnace such that the fuel and combustion air are in a predetermined air-fuel ratio, in Patent Document 1, the flow coefficient (V) of the flow control valve installed in the fuel supply system and the combustion air supply system is calculated by applying the measured value of the supply pressure (P0) to a predetermined equation (A) which represents the relationship between the flow coefficient (N) of the burner set as a predetermined fixed value, the fuel flow rate set for the combustion amount of the burner, the flow rate of combustion air obtained from the fuel flow rate and the predetermined air-fuel ratio, and the fluid supply pressure (P0) at the primary side of the flow control valve installed in the fuel supply system and the combustion air supply system, respectively; at the same time, the relationship between the valve opening (S') of the flow control valve and the flow coefficient (V') is measured in advance, the deviation is calculated by comparing the measured flow coefficient (V') with the flow coefficient (V') obtained by the above calculation, and the air-fuel ratio is adjusted by adjusting the valve opening so that this deviation becomes 0 (zero). It is being shown that the amount of combustion is controlled while being maintained at a constant level. In addition, in Patent Document 2, at least, the relationship between the flow coefficient and the opening degree is input to a burner control device the measured value of the opening degree of a known fuel control valve, the relationship between the flow coefficient and the opening degree is input to a measured value of the opening degree of a known combustion air control valve, the measured value of the supply temperature and supply pressure of fuel supplied to a known burner, the measured value of the supply temperature and supply pressure of combustion air supplied to the burner, the measured value of the furnace temperature, and the measured value of the furnace pressure; the burner control device determines the combustion amount of the burner from the deviation between the measured value of the furnace temperature and the set value, calculates the opening degrees of the fuel control valve and the combustion air control valve corresponding to the fuel flow rate and combustion air flow rate that maintain the determined combustion amount of the burner by a complex filtering operation to maintain a preset combustion air ratio, and controls the flow rates of fuel and combustion air by adjusting the opening degrees of each control valve so that the measured value of the opening degree of the fuel control valve and the combustion air control valve matches the calculated value of the opening degree of the fuel control valve and the combustion air control valve obtained by the complex filtering operation. It is shown that the burner control device stores each of the above-mentioned measurement values for a predetermined period of time while always updating them to the latest measurement value, and if any of the measurement values exceeds the allowable range for the set value of each measurement item, the updating of the measurement value is stopped after a predetermined period of time has elapsed from the point at which the allo