JPH06249431A - Gas supply control in ignition of gas boiler - Google Patents

Abstract

PURPOSE:To prevent unstable combustion by preventing the increase of gas supply pressure to be generated in starting of gas supply to a gas burner. CONSTITUTION:Gas whose pressure is adjusted by a governor 5 can be supplied to a burner 8 by opening a downstream side solenoid valve 6 a set time after an upstream side solenoid valve 4 of a gas fuel piping line is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to gas supply during ignition of a gas fired boiler.

[0002]

2. Description of the Related Art Generally, a gas fuel piping line for supplying fuel to a burner for a gas-fired boiler has an electromagnetic opening / closing valve for shutting off gas from a supplier side, a governor for adjusting gas supply pressure, and for gas shutting off. It is composed of an electromagnetic on-off valve and a burner. When starting combustion, the two electromagnetic on-off valves open simultaneously, and the gas whose pressure is adjusted by the governor is sent to the burner.However, immediately after opening the electromagnetic on-off valve, the gas adjustment pressure in the governor is complete. Instead, gas with a pressure higher than the set value may be temporarily supplied to the burner. In that case,
Occurrence of vibration may occur due to high gas supply pressure, or fire may occur due to relative lack of oxygen due to large gas amount.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to prevent a gas supply pressure from increasing at the start of gas supply to a gas burner and prevent combustion from becoming unstable. To supply.

[0004]

According to the present invention, in order to solve the above-mentioned problems, after the upstream side electromagnetic on-off valve of the gas fuel piping line is opened, the downstream side electromagnetic on-off valve is waited for a set time. The problem is solved by opening the valve, and the gas supply pressure during ignition is stabilized to prevent an abnormal increase in the supply gas pressure during ignition and stabilize the combustion.

[0005]

[Operation] Immediately after the upstream electromagnetic on-off valve is opened at the time of ignition or the like, the governor itself cannot adjust the pressure in time, and gas is supplied at a pressure higher than the set pressure. However, since the downstream electromagnetic on-off valve is closed, the gas passing through the governor is blocked by the lower electromagnetic on-off valve, and the burner is not affected. Then, the pressure is adjusted by the governor itself until the lower electromagnetic on-off valve opens, and the gas adjusted to the set pressure can be sent to the burner by opening the downstream electromagnetic on-off valve.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a system diagram of a gas pipe of one embodiment, and FIG. 2 shows fluctuations in gas supply pressure from the main governor at the time of main ignition. The strainer (1) is provided on the gas supply side, and after branching to the main line (2) and the pilot line (3), the main line is the main upstream side solenoid valve (4), the main governor (5), the main downstream side. It is connected to the electromagnetic on-off valve (6), the main cock (7), and the burner (8), and the pilot line has a pilot upstream-side electromagnetic on-off valve (9), a pilot governor (10), a pilot downstream-side electromagnetic on-off valve ( 11), a pilot cock (12), and a burner. A signal is sent to the electromagnetic on-off valve opening / closing control section (14) that gives a time difference when the electromagnetic on-off valve is opened by a control signal of the combustion control device (13), and each electromagnetic on-off valve is opened from the electromagnetic on-off valve opening / closing control section. Signal is transmitted to.

When the combustion of the gas burner is switched from the pilot flame to the main flame, the combustion control device outputs a signal for opening the electromagnetic on-off valve to the electromagnetic on-off valve opening / closing control section, and the electromagnetic on-off valve opening / closing control section firstly starts the main operation. Open the upstream solenoid valve. When passing through the governor, the gas that has passed through the main upstream side electromagnetic on-off valve passes at a pressure higher than the set pressure and reaches just before the main downstream side electromagnetic on-off valve, but the main downstream side electromagnetic on-off valve is still closed. It is blocked by an electromagnetic on-off valve. One second after the main upstream side solenoid valve is opened, the solenoid on-off valve opening / closing control unit opens the main downstream side solenoid valve. When the downstream side opens, the pressure is adjusted by the governor, the gas at the set pressure is supplied to the burner, and the combustion of the main flame is started.

The same applies when the pilot flame is ignited,
Gas of the set pressure can be supplied by opening the pilot downstream-side electromagnetic on-off valve after opening the pilot upstream-side electromagnetic on-off valve. In addition, a composite valve that combines an electromagnetic on-off valve, a governor, and an electromagnetic on-off valve that could not be used due to ignitability problems can be effectively used by using this method, contributing to piping space and manufacturing cost. it can.

[0009]

By carrying out the present invention, since combustion can be started at a set gas pressure, it is possible to prevent misfire that has occurred at the start of combustion and transitional ignition that has occurred during transition to combustion. It was

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is a graph showing fluctuations in gas supply pressure from the main governor.

[Explanation of symbols]

 1 Strainer 2 Main line 3 Pilot line 4 Main upstream solenoid valve 5 Main governor 6 Main downstream solenoid valve 8 Burner 13 Combustion control device 14 Solenoid valve controller

Claims (1)

[Claims] 1. When starting combustion in a gas supply pipeline from a gas supply piping upstream side to a burner for a gas-fired boiler connected to a burner via an electromagnetic opening / closing valve, a governor, and an electromagnetic opening / closing valve, A combustion control method for a gas boiler, comprising a delay circuit that opens the upstream electromagnetic on-off valve and controls the downstream electromagnetic on-off valve to open after a lapse of a predetermined time.