KR-102964954-B1 - Combustion control method for combustion equipment

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 combustion air and fuel gas are ejected from the burner into the furnace (10) to burn, the atmosphere gas inside the furnace (10) is guided to the oxygen concentration sensor (51) by the collection pipe (12), and the oxygen concentration detected by the oxygen concentration sensor (51) is output to the output control device (52), and the moving average value of the oxygen concentration is calculated by the output control device, and the air ratio control system is controlled by the output control device based on the moving average value of the oxygen concentration, and the ratio of combustion air supplied to the burner and fuel is adjusted.

Inventors

• 가타야마 도모키
• 사이토 도시키
• 아리마츠 다케시
• 사쿠베야 고지

Assignees

• 쥬가이로 고교 가부시키가이샤

Dates

Publication Date

20260513

Application Date

20230621

Priority Date

20220831

Claims (3)

1. A combustion control method for a combustion facility that adjusts the ratio of fuel supplied to a burner through a fuel supply pipe and combustion air supplied to a burner through an air supply pipe using an air ratio control system, and injects combustion air and fuel from the burner into a furnace for combustion, wherein an atmosphere gas within the burner is guided to an oxygen concentration sensor by a sampling pipe, the oxygen concentration of the guided atmosphere gas is detected by the oxygen concentration sensor and output to an output control device, a moving average value of the oxygen concentration detected by the output control device is calculated, and the air ratio control system is controlled by the output control device based on the moving average value of the oxygen concentration, and when adjusting the ratio of combustion air and fuel supplied to the burner, the ratio of combustion air and fuel supplied to the burner is adjusted stepwise at every predetermined control time (tx).
2. In the description of claim 1, A combustion control method for a combustion facility, characterized in that the air-fuel ratio control system is controlled based on the moving average value of the oxygen concentration, and the ratio of combustion air supplied to the burner to the fuel is adjusted at each predetermined control time (tx), wherein the control time (tx) is greater than or equal to the detection elapsed time (ta) from when the atmosphere gas inside the furnace is guided to the oxygen concentration sensor by the sampling tube until the oxygen concentration is detected.
3. In the description of claim 1 or claim 2, A combustion control method for a combustion facility, characterized by adjusting the step of changing the ratio of combustion air and fuel supplied to the burner according to the magnitude of the change in the moving average value of the oxygen concentration obtained by the above output control device from a predetermined range, and increasing the step of changing the ratio of combustion air and fuel supplied to the burner when the change in the moving average value of the oxygen concentration changes significantly from the predetermined range.

Description

Combustion control method for combustion equipment The present invention relates to a combustion control method for a combustion facility that adjusts the ratio of fuel supplied to a burner through a fuel supply pipe and combustion air supplied to the burner through an air supply pipe using an air-ratio control system, and injects combustion air and fuel from the burner into a furnace for combustion. In particular, the invention is characterized by drawing atmospheric gas from inside the furnace into a sampling pipe and guiding it to an oxygen concentration sensor, detecting the oxygen concentration inside the furnace by the oxygen concentration sensor, and adjusting the ratio of fuel supplied to the burner and combustion air so that the oxygen concentration inside the furnace becomes a predetermined value, thereby enabling stable combustion. Conventionally, in a combustion facility, the ratio of fuel supplied to the burner through a fuel supply pipe and combustion air supplied to the burner through an air supply pipe is adjusted so that the air ratio within the burner becomes a predetermined value, and the fuel and combustion air are ejected from the burner into the furnace to be combusted. Here, when fuel and combustion air are ejected from the burner into the furnace for combustion by making the air-fuel ratio within the burner a predetermined value, in Patent Document 1, the flow coefficient (N) of the burner, which is set as a predetermined fixed value, the flow rate of combustion air obtained from the fuel flow rate and the air-fuel ratio, which is set for the combustion amount of the burner, and the supply pressure (P0) of the fluid at the primary side of the flow control valve installed in the fuel supply system and the combustion air supply system are each 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, which is set as a predetermined fixed value, the fuel flow rate set for the combustion amount of the burner, and the flow rate of combustion air obtained from the fuel flow rate and the air-fuel ratio set as predetermined, and 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, and the deviation is calculated by comparing the measured flow coefficient (V') with the flow coefficient (V) obtained by the above calculation, and the valve opening is adjusted so that this deviation becomes 0 (zero), thereby maintaining the air-fuel ratio constant It is indicated that the amount of combustion is controlled. 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 means of a composite 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 composite filtering operation. In the burner control device described above, each measurement value is always updated to the latest measurement value and stored for a predetermined period of time. At the same time, 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 allowable range was exceeded. At the point at which the updating of the measurement value is stopped, the cause of the exceedance of the allowable range is determined by comparing the respective measurement values measured before the allowable range was exceeded and the respective measurement values measured after the allowable range was exceeded, which are st