CN-224230003-U - Safety guarantee system for low-temperature rising process of double-heat-storage heating furnace

Abstract

The utility model belongs to the technical field of industrial heating furnaces, and relates to a safety guarantee system for a low-temperature rising process of a double-heat-storage heating furnace, which comprises a double-heat-storage heating furnace, wherein the double-heat-storage heating furnace comprises a heating furnace body and a furnace baking burner arranged on the heating furnace body, the furnace baking burner is provided with an air interface, a gas interface and a peeping port, and further comprises an external open fire system, the external open fire system comprises an open fire spray pipe, a check valve, a connecting hose and a gas tank which are sequentially connected in series, and the open fire spray pipe is inserted into the furnace baking burner through the peeping port so as to ensure the combustion of low-heat blast furnace gas in the furnace baking burner by utilizing the normal-fire flame of the open fire spray pipe in the low-temperature rising process of the double-heat-storage heating furnace. The utility model effectively solves the core problem of poor combustion stability of the low-calorific-value blast furnace gas through the breakthrough design of the external open fire system.

Inventors

• WANG HUIYAO
• CHEN ZHONG
• ZHENG HAIFENG
• HAN XIAOREN
• LIU FENGYI

Assignees

• 重庆赛迪热工环保工程技术有限公司

Dates

Publication Date

20260512

Application Date

20250324

Claims (8)

1. 1. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace comprises the double heat storage heating furnace, wherein the double heat storage heating furnace comprises a heating furnace body and a baking furnace burner arranged on the heating furnace body, and the baking furnace burner is provided with an air interface, a gas interface and a peeping port and is characterized by further comprising an external open fire system; the external open fire system comprises an open fire spray pipe, a check valve, a connecting hose and a gas tank which are sequentially connected in series, and the open fire spray pipe is inserted into a furnace burner through a peeping port so as to ensure the combustion of low-heat-value blast furnace gas in the furnace burner by utilizing the normal-combustion flame of the open fire spray pipe in the low-temperature-rise process of the double-heat-accumulation heating furnace.
2. 2. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace according to claim 1, wherein a cut-off valve is further arranged between the check valve and the connecting hose.
3. 3. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace according to claim 2, wherein the cutoff valve is a ball valve or a gate valve.
4. 4. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace of claim 1, wherein an adjusting stop valve is arranged at the top of the gas tank to adjust the output flow of the gas tank.
5. 5. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace according to claim 1, wherein the gas tank is filled with high-heat-value LPG.
6. 6. The safety guarantee system for the low-temperature rise process of the double heat storage heating furnace of claim 1, wherein the open fire spray pipe is a high-temperature resistant steel pipe.
7. 7. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace according to claim 6, wherein the outer diameter of the high-temperature resistant steel tube is smaller than the inner diameter of the peep hole so as to be convenient for insertion into the peep hole.
8. 8. The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace according to claim 1, wherein the connecting hose is a stainless steel corrugated hose or a synthetic rubber hose.

Description

Safety guarantee system for low-temperature rising process of double-heat-storage heating furnace Technical Field The utility model belongs to the technical field of industrial heating furnaces, and relates to a safety guarantee system for a low-temperature rising process of a double-heat-storage heating furnace. Background The double-heat-storage heating furnace is used as key equipment for high efficiency and energy conservation in the steel industry, and has the core advantages that the heat accumulator is used for recovering the waste heat of the flue gas and preheating air and coal gas to high temperature (generally reaching more than 1000 ℃), so that the fuel consumption and pollutant emission are obviously reduced. After the double heat storage heating furnace is built, low-temperature baking and high-temperature baking can be performed according to a set baking curve. The low-temperature baking is to remove free water in the castable (or plastic), and the high-temperature baking is to remove crystal water of special components of the castable (or plastic). After the high-quality baking furnace is finished, the service life of the heating furnace refractory material can be effectively prolonged, and the heat insulation effect and the energy-saving effect of the heating furnace refractory material are improved. Secondly, when the double heat storage heating furnace is used normally, the furnace is shut down under the conditions of regular equipment overhaul, oxidized steel slag removal and the like, and after the equipment overhaul, oxidized steel slag removal is completed, the temperature of a hearth of the heating furnace is raised to the required temperature of the billet heating furnace according to a heating curve, wherein the heating curve comprises a low-temperature heating process and a high-temperature heating process. Therefore, the primary furnace baking process of the double heat storage heating furnace and the temperature rising process after the periodic overhaul and clear oxidation of the steel slag are all required to be subjected to the low temperature rising process. The baking furnace is an essential link for recovering production after the double heat storage heating furnace is put into operation or overhauled, and the core aim is to remove free water and crystal water in the refractory material through gradient heating so as to ensure the structural stability of the furnace body. According to the established technology, the low-temperature baking stage (less than or equal to 700 ℃) needs to rely on a baking burner for heat supply, and the high-temperature heating process and the normal production process are switched to a double heat storage burner. However, when the low-heat-value blast furnace gas (the heat value is less than or equal to 850kCal/Nm 3) is adopted as the furnace burner, the inherent characteristics of the phenomena of fire removal or tempering are very easy to occur in a low-temperature environment due to the poor combustion characteristic and low flame propagation speed, the fire removal can cause the combustion interruption of the double-heat-storage heating furnace in the low-temperature furnace drying process, the unburnt coal gas leaks into a hearth and a pipeline and is mixed with air to form explosive gas, and the tempering can burn out a burner and air supply equipment to cause safety accidents. In summary, how to realize safe and stable combustion of the dual heat storage heating furnace in the low temperature baking stage, avoid gas leakage and abnormal flame, simplify the system structure and reduce the operation and maintenance costs, and still remain the technical difficulties to be broken through in the art. The prior art has not provided a solution that is economical, reliable and adaptive, especially in the scenario that low heating value gas is directly applied to the oven burner, innovative design is needed to fill this gap. Disclosure of utility model Therefore, the utility model aims to provide a safety guarantee system for the low temperature rise process of the double heat storage heating furnace, so as to solve the safety problems of flame extinction and gas leakage of the double heat storage heating furnace in the low temperature rise process. In order to achieve the above purpose, the present utility model provides the following technical solutions: The safety guarantee system for the low-temperature rising process of the double heat storage heating furnace comprises the double heat storage heating furnace, wherein the double heat storage heating furnace comprises a heating furnace body and a baking furnace burner arranged on the heating furnace body, the baking furnace burner is provided with an air interface, a gas interface and a peeping port, and the safety guarantee system further comprises an external open fire system; the external open fire system comprises an open fire spray pipe, a check valve, a connecting hose and a gas tank whi