阅读说明：本技术 一种燃气炉管路结构及四段燃烧技术 (Gas furnace pipeline structure and four-section combustion technology ) 是由 李明科 贾红梅 王卫臣 王振永 杨利伟 杨战胜 于 2020-12-24 设计创作，主要内容包括：本发明涉及燃气炉技术领域,特别是涉及一种燃气炉管路结构及四段燃烧技术,现有燃气炉热量损耗严重,一种燃气炉管路结构,包括炉体,所述炉体连接空气管路和燃气管路,所述空气管路包括第一进气管和第二进气管,所述第一进气管和第二进气管上分别设置蓄热式烧嘴、换向阀和热风蝶阀,所述燃气管路包括燃气进气口、第一燃气管路、第二燃气管路和燃气出气口,所述第二燃气管路上设置小火燃气阀,所述第一燃气管路上设置大火燃气阀,节能减排,在燃气炉技术领域具有良好的发展前景。(The invention relates to the technical field of gas furnaces, in particular to a gas furnace pipeline structure and a four-section combustion technology, the existing gas furnace has serious heat loss, and the gas furnace pipeline structure comprises a furnace body, wherein the furnace body is connected with an air pipeline and a gas pipeline, the air pipeline comprises a first air inlet pipe and a second air inlet pipe, heat accumulating type burners, a reversing valve and a hot air butterfly valve are respectively arranged on the first air inlet pipe and the second air inlet pipe, the gas pipeline comprises a gas inlet, a first gas pipeline, a second gas pipeline and a gas outlet, a small-fire gas valve is arranged on the second gas pipeline, a large-fire gas valve is arranged on the first gas pipeline, energy conservation and emission reduction are realized, and the gas furnace pipeline structure has a good development prospect in the technical field of gas furnaces.)

1. A gas furnace pipeline structure comprises a furnace body (1), and is characterized in that the furnace body (1) is connected with an air pipeline (4) and a gas pipeline (3), the air pipeline (4) comprises a first air inlet pipe (4.1) and a second air inlet pipe (4.2), the first air inlet pipe (4.1) and the second air inlet pipe (4.2) are respectively provided with a heat accumulating type burner, a reversing valve (4.3) and a hot air butterfly valve (4.4), the gas pipeline (3) comprises a gas inlet (5), a first gas pipeline (7), a second gas pipeline (6) and a gas outlet (8), valves (9) are respectively arranged on the gas inlet pipe (5), the first gas pipeline (7) and the second gas pipeline (6), a small-fire gas valve (6.1) is arranged on the second gas pipeline (6), and a large-fire gas valve (7.1) is arranged on the first gas pipeline (7).

2. A gas furnace pipe structure according to claim 1, wherein the second gas pipe (6) has a smaller diameter than the first gas pipe (7).

3. A gas furnace pipe structure according to claim 1, wherein said air pipe (4) is a Y-tee and is connected to the forebody (1) through a bellows (2).

4. A four-section combustion technology is characterized in that air enters a furnace body (1) through a reversing valve on an air pipeline (4) in a switching mode, the air is alternately heated through a regenerative burner heat accumulator, heated high-temperature air enters a hearth, smoke in the furnace forms oxygen-poor high-temperature airflow with low oxygen content, the smoke is injected into gas through a gas inlet (5) to be combusted in an oxygen-poor state, then low-temperature smoke with the temperature lower than 130 ℃ is exhausted through another reversing valve which is not used for entering air on the air pipeline, two regenerative combustors in the furnace body are in a heat accumulation and heat release alternating working state, and one of the combustion modes including low-temperature flame big flame combustion, low-temperature flame small flame combustion, high-temperature flameless big flame combustion and high-temperature flameless small flame combustion is adopted.

5. The four-stage combustion technology according to claim 4, wherein, according to the heat treatment state, the low-temperature flamed big fire combustion mode is used in the high-speed temperature rising stage; the mode of low-temperature flame small fire combustion is used in a segmental heat preservation state, and the mode is switched with low-temperature flame large fire for use; a mode of high-temperature flameless big fire combustion is used in a high-temperature state; the mode of high-temperature flameless small fire combustion is used in the high-temperature state and the non-heat-preservation state, and the mode is switched with the mode of high-temperature flameless large fire for use.

Technical Field

The invention relates to the technical field of gas furnaces, in particular to a gas furnace pipeline structure and a four-section combustion technology.

Background

The gas furnace is suitable for normalizing, temperature equalizing quenching and the like of various metal parts and materials, and utilizes fuel combustion or other heat sources for heating to generate heat.

The existing gas furnace generally has the problems of serious heat loss and incapability of fully utilizing fuel heat, and the existing gas furnace still consumes more fuel in a state of not needing a large amount of heat due to a non-differential heating mode, so that new equipment is developed to strengthen heat transfer in the furnace, the original low-speed mode is changed, the high-speed combustion characteristic is adopted to increase the circulation speed and circulation quantity of hot gas in the furnace, and the temperature equalization time in the furnace is shortened, so that the effect of using energy conservation is achieved.

Disclosure of Invention

In view of the above situation, the present invention provides a gas furnace pipeline structure and four-stage combustion technology to overcome the defects of the prior art, and solves the problem of serious heat loss of the prior gas furnace.

The technical proposal is that the gas furnace pipeline structure comprises a furnace body, the furnace body is connected with an air pipeline and a gas pipeline, the air pipeline comprises a first air inlet pipe and a second air inlet pipe, the first air inlet pipe and the second air inlet pipe are respectively provided with a regenerative burner, a reversing valve and a hot air butterfly valve, the gas pipeline comprises a gas inlet, a first gas pipeline, a second gas pipeline and a gas outlet, the gas inlet pipe, the first gas pipeline and the second gas pipeline are respectively provided with valves which are mutually independent, the valve is opened or closed according to the requirement to control the entering amount of the fuel gas, a small-fire fuel gas valve is arranged on the second fuel gas pipeline, the first gas pipeline is provided with a big fire gas valve, the furnace body is internally provided with two communicated heat accumulating type burners, the pipeline which enters the air is alternately in a heat storage state and a heat release state, so that a complete circulation path is formed.

Still further, the second gas line diameter is smaller than the first gas line diameter.

Furthermore, the air pipeline is a Y-shaped tee joint and is communicated with the forehearth body through a corrugated pipe.

A four-section combustion technology is characterized in that air enters a furnace body through a reversing valve on an air pipeline in a switching mode, the air is alternately heated through a heat accumulating type burner heat accumulator, heated high-temperature air enters a hearth, smoke in the furnace forms oxygen-poor high-temperature airflow with low oxygen content, the gas is injected through a gas inlet to combust in an oxygen-poor state, then low-temperature smoke with the temperature lower than 130 ℃ is discharged through another reversing valve which is not used for entering air on an air pipeline, two heat accumulating type combustors in the furnace body are in a heat accumulating and heat releasing alternative working state, and one of combustion modes including low-temperature flame big-fire combustion, low-temperature flame small-fire combustion, high-temperature flameless big-fire combustion and high-temperature flameless small-fire combustion is adopted according to a heat treatment.

Furthermore, according to the heat treatment state, a low-temperature flaming big fire combustion mode is used in the high-speed temperature rising section; the mode of low-temperature flame small fire combustion is used in a segmental heat preservation state, and the mode is switched with low-temperature flame large fire for use; the method of high-temperature flameless big fire combustion is used in a high-temperature state, the aim is to reduce the content of NOX, and at the moment, the full furnace is all scarlet but flame can not be seen; the mode of high-temperature flameless small fire combustion is used in the high-temperature state and the non-heat-preservation state, and the mode is switched with the high-temperature flameless large fire for use; the four-section combustion technology is reasonably controlled and utilized, which combustion mode is controlled and used in which heat treatment state, and the combustion technology greatly expands the energy-saving technology and the emission application field in the heat treatment industry.

The invention has the technical effects that the exhaust gas temperature is reduced, and particularly for natural gas fuel, the energy is averagely saved by more than 30 percent, and the energy-saving potential is huge; compared with the conventional burner for supplying heat, the technology expands the flame combustion area to the boundary of the hearth, alternately supplies heat and alternately discharges smoke, greatly improves the temperature uniformity of the furnace, and greatly improves the heating quality of products; compared with the conventional industrial furnace, the heat transfer in the furnace is enhanced after the technology is applied, and the hearth is a heating and soaking zone, so that the yield of the furnace with the same volume can be improved by more than 20 percent; compared with the traditional combustion technology, the ultra-large four-section heat accumulating type high-speed combustion technology is adopted, oxygen-deficient combustion can be realized in the hearth, and the content of NOx in the flue gas can be greatly reduced.

Drawings

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

Fig. 2 is a schematic view of the gas pipeline structure of the present invention.

In the figure: 1. the gas stove comprises a stove body, a corrugated pipe 2, a gas pipeline 3, an air pipeline 4, a first gas inlet pipe 4.1, a second gas inlet pipe 4.2, a reversing valve 4.3, a hot air butterfly valve 4.4, a gas inlet 5, a second gas pipeline 6, a small fire gas valve 6.1, a first gas pipeline 7, a large fire gas valve 7.1, a gas outlet 8 and a valve 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows: as shown in fig. 1 to 2, a gas furnace pipeline structure comprises a furnace body 1, the furnace body 1 is connected with an air pipeline 4 and a gas pipeline 3, the air pipeline 4 comprises a first air inlet pipe 4.1 and a second air inlet pipe 4.2, the first air inlet pipe 4.1 and the second air inlet pipe 4.2 are respectively provided with a regenerative burner, a reversing valve 4.3 and a hot air butterfly valve 4.4, the gas pipeline 3 comprises a gas inlet 5, a first gas pipeline 7, a second gas pipeline 6 and a gas outlet 8, the gas inlet pipe 5, the first gas pipeline 7 and the second gas pipeline 6 are respectively provided with valves 9 which are mutually independent, the valves are opened or closed according to requirements to control the entering amount of gas, the second gas pipeline 6 is provided with a small-fire gas valve 6.1, the first gas pipeline 7 is provided with a large-fire valve 7.1, two communicated burners are arranged in the furnace body, the pipeline which enters the air is alternately in a heat storage state and a heat release state, so that a complete circulation path is formed.

Example two: on the basis of the first embodiment, the gas inlet 5, the first gas pipeline 7 and the gas outlet 8 are connected with each other to form an L-shaped pipe, the bent parts are connected with each other by adopting a bent pipe, the first gas pipeline 7 is grooved at the head and the tail of the first gas pipeline for the second gas pipeline 6 to be connected, the joint is welded, the first gas pipeline 7 and the second gas pipeline 6 form a pipeline structure which is capable of introducing gas through the gas inlet and discharging gas through the gas outlet and is independent from each other, the gas outlet 8 is connected with the furnace body by a movable joint, the diameter of the second gas pipeline 6 is smaller than that of the first gas pipeline 7, the air pipeline 4 is a Y-shaped tee joint and is communicated with the furnace body 1 through the corrugated pipe 2.

In the above embodiment, the second fuel gas pipeline 6 is a galvanized pipe with a diameter of 4cm, the first fuel gas pipeline 7 is a galvanized pipe with a diameter of 6.5cm, and the valve 9 is a copper ball valve and is used for controlling the on-off of fuel gas.

A four-section combustion technology, on the basis of the above-mentioned gas furnace pipeline structure, the air is switched and entered the furnace body 1 by the reversing valve on the air line, heat the heat accumulator of burner heat accumulator alternately and heated, the high-temperature air heated enters the burner hearth, the flue gas in the stove forms the lean oxygen high-temperature airstream of oxygen content rarefied, the gas injected through the gas inlet 5 burns under the state of lean oxygen, then discharge through another reversing valve not entering the air on the air line with the low-temperature flue gas lower than 130 degrees C, two heat accumulation type burners in the furnace body are in heat accumulation and heat release the alternative working condition, according to the heat treatment state, adopt including low-temperature there is big flame combustion, low-temperature there is little flame combustion, high-temperature there is big flame combustion, high-temperature there is no flame and little flame combustion in one of combustion; specifically, the method comprises the following steps: in the high-speed temperature rise stage, a low-temperature flame big-fire combustion mode is used, the condition that the outer part meets the quenching requirement but the inner part does not meet the processing requirement due to large difference of heat quantity between the inner part and the outer part of a workpiece is prevented, the low temperature in the furnace is kept, the valve on the second gas pipeline 6 is closed, and the gas passes through the first gas pipeline 7 and the big-fire gas valve 7.1 works; the low-temperature flameless combustion mode is used in a segmental heat preservation state, the low temperature in the furnace is kept, the valve on the first gas pipeline 7 is closed, the gas passes through the second gas pipeline 6 and is realized by the work of the small-flame gas valve 6.1, the gas is switched with the low-temperature flameless combustion mode for use by the adjustment of the valve and the gas valve switch, and the high-temperature flameless combustion mode is used in a high-temperature state, so that the high-temperature flameless combustion mode is kept; the high-temperature flameless small fire combustion mode is used in the high-temperature state and the non-heat-preservation state, the flameless combustion is realized by keeping the high temperature in the furnace, and the high-temperature flameless large fire is switched to be used by adjusting the switches of the valve and the gas valve; the four-section combustion technology is reasonably controlled and utilized, which combustion mode is controlled and used in which heat treatment state, and the combustion technology greatly expands the energy-saving technology and the emission application field in the heat treatment industry.

The invention has the technical effects that the exhaust gas temperature is reduced, and particularly for natural gas fuel, the energy is averagely saved by more than 30 percent, and the energy-saving potential is huge; compared with the conventional burner for supplying heat, the technology expands the flame combustion area to the boundary of the hearth, alternately supplies heat and alternately discharges smoke, greatly improves the temperature uniformity of the furnace, and greatly improves the heating quality of products; compared with the conventional industrial furnace, the heat transfer in the furnace is enhanced after the technology is applied, and the hearth is a heating and soaking zone, so that the yield of the furnace with the same volume can be improved by more than 20 percent; compared with the traditional combustion technology, the ultra-large four-section heat accumulating type high-speed combustion technology is adopted, oxygen-deficient combustion can be realized in the hearth, and the content of NOx in the flue gas can be greatly reduced.

The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.