JPS60144591A - Heating method of furnace by on-off of plurality of burner - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating method for a heat treatment furnace for iron, steel, etc., which efficiently heats the furnace, and achieves stricter uniformity of the temperature inside the furnace and energy saving.

In case of batch type heating furnace 1. The on/off control system for the bar site is well known as a system that heats the bar more effectively and uniformly, but in order to further save energy, a heat exchanger is installed as shown in Figure 1. be. In Fig. 1, 1 is a heating furnace, 2, --m--2
3 is a burner, 3 is a fuel supply pipe, 4 is an air supply path, 5a is a heat exchanger, and 6 is a blower. The heat exchanger 5a is configured to preheat the fuel air with the exhaust gas of the furnace. 7 is a fuel solenoid valve, 8 is an air solenoid valve, 9 is a temperature compensation control valve, and 10 is an exhaust gas path. However, even with this type, there are large changes in furnace temperature and combustion amount, so
Heat exchanger planning becomes difficult.

Even if a heat exchanger is planned, the preheating temperature of the combustion air will change significantly, which will disrupt the air ratio and complicate combustion control.Additionally, the control equipment will need to be heat resistant, and the Because it is necessary to keep the combustion air piping warm,
At present, there is not much benefit from installing a heat exchanger.

This invention was made to solve such problems, and the invention will be explained based on FIGS. 2 and 3. Components that are the same or almost the same as those in FIG. and omit the explanation.

Furnace 1 includes a plurality of burners 2.・・・・・・Place 2,
In a method of heating a furnace l by repeatedly turning each burner 2 on and off (ignition/non-ignition) according to a predetermined order, each burner 2 is independently provided with combustion. Combustion air preheated by the air preheating heat exchanger 5 is used to perform combustion in each burner 2 at a constant air ratio or electro-air fuel ratio combustion at the maximum air injection amount and fuel injection amount.

In other words, in this invention, the burners are arranged at equal intervals on the left and right side walls of the furnace (however, the left and right burners are arranged in a staggered manner), and when these burners are in the ON state and during combustion, the maximum air jet is generated. Electro-air-fuel ratio combustion is carried out in terms of the amount of fuel and the amount of fuel ejected, and neither air nor fuel is ejected in the OFF state. Further, each barboo is equipped with a combustion air preheating device (see, for example, Japanese Patent Laid-Open No. 56-91111) or attached thereto. In this way, combustion air can be preheated in each burner regardless of changes in the amount of combustion in the furnace, and combustion control can be performed in the same manner as when the combustion air is not preheated. Another feature is that there is no need to insulate the combustion air piping.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional furnace. FIG. 2 is a plan view of the furnace of the present invention, and FIG. 3 is an enlarged view of the main parts of FIG. 1 Furnace 2 Burner 3 Fuel supply pipe 4 Air supply path 5 Heat exchanger 6 Blower 7 Fuel solenoid valve 8 Air solenoid valve 9 Temperature correction control valve 10 Exhaust gas path Patent applicant Sanken Sangyo Co., Ltd. Agent Patent attorney Furu 1 ) Goukei procedural amendment 1. Display of the case Japanese Patent Application No. 58-247735 2, Title of the invention Furnace heating method by turning on and off multiple burners 3, Person making the amendment Relationship with the case Patent applicant Sanken Sangyo Co., Ltd. 4, Agent ■730 5. Date of amendment order Voluntary action 6. The detailed description of the invention, which will be increased by the amendment, will be amended as follows. (b) Amend the claims as shown in the attached sheet. (b) On page 2, line 5, "fuel" in "fuel air" is corrected to "yaki". (c) Correct "injection" in "injection amount" on page 3, line 7, to "output". Claims: A method for heating a furnace in which a plurality of burners are arranged in a furnace and each burner is repeatedly ignited and non-ignited according to a predetermined order, in which a combustion air preheating device is provided independently for each burner. A heating method for a furnace by turning on and off multiple burners, characterized in that combustion air preheated by combustion air is used to perform electro-air-fuel ratio combustion at the maximum air jetting amount and fuel jetting amount of each burner. ias^

Claims (1)

[Claims] A method of heating a furnace by arranging multiple burners in a furnace and repeatedly igniting and non-igniting each burner in a predetermined order, in which each burner is preheated by an independent combustion air preheating device. A method of heating a furnace by turning on and off multiple burners, which is characterized by using combustion air to carry out combustion in each burner at a constant air/fuel ratio combustion with maximum air and fuel injection amounts. .