CN201538799U - Regenerative non-oxidation heating furnace - Google Patents

Abstract

The utility model provides a regenerative non-oxidation heating furnace, comprising: a furnace body; a first regenerative burner arranged on one side of the furnace body, equipped with a first air regenerator and a first gas regenerator, The first air regenerator is connected to the first port of the air reversing valve through the first air/flue gas pipeline, and the second port of the air reversing valve is connected to the air flow meter, the electric air flow regulating valve and the air flow through the air pipeline in turn. The smoke assist fan is connected, and the third port of the air reversing valve is connected with the air smoke electric control valve and the air smoke fan in turn through the air smoke exhaust pipe, and an air smoke exhaust temperature sensor is arranged on the air smoke exhaust pipe; the first The gas regenerator is connected to the first port of the gas reversing valve through the first gas/flue gas pipeline, and the second end of the gas reversing valve is connected to the gas flow meter, the electric gas flow control valve and the gas Source connection can effectively improve the utilization rate of heat energy.

Description

Regenerative non-oxidation heating furnace

technical field

The utility model relates to a regenerative industrial furnace, in particular to a regenerative non-oxidation heating furnace which can be applied to a metallurgical strip continuous annealing production line, as well as hot-dip galvanizing, hot-dip aluminum and hot-dip aluminum-zinc-silicon production lines.

Background technique

In the Sendzimir galvanizing process, the oxidation of the steel strip heated by the preheating furnace is relatively serious, and the temperature of the exhaust gas is relatively high. Even if there are heat exchange measures, the heat exchange efficiency is low, and the atmosphere in the furnace is difficult to control. Value fuels (such as blast furnace gas) are used in metallurgical strip continuous annealing production lines, hot-dip galvanizing, hot-dip aluminum, and hot-dip aluminum-zinc-silicon production lines.

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide a regenerative non-oxidation heating furnace, which can effectively improve the utilization rate of heat energy.

In order to achieve the above purpose, the utility model provides a regenerative non-oxidation heating furnace, comprising:

Furnace body;

The first regenerative burner 1 is arranged on one side of the furnace body, and the first regenerative burner 1 is equipped with a first air regenerator 3 and a first gas regenerator 2, wherein the first The air regenerator 3 is connected to the first port of the air reversing valve 13 through the first air/flue gas pipeline 27; the first gas regenerating chamber 2 is connected to the gas reversing valve 8 through the first gas/flue gas pipeline 26 The first port of the connection;

The first premix chamber 38 is arranged in the furnace body and corresponds to the position of the first regenerative burner 1 . One port of the supplementary combustion air quick-cut valve 5 is connected, and the other port of the first supplementary combustion air quick-cut valve 5 is connected with one end of the secondary supplementary combustion main pipeline 28;

The second regenerative burner 19 is arranged on the other side of the furnace body, and the second regenerative burner 19 is equipped with a second air regenerator 21 and a second gas regenerator 20, wherein the The second air regenerator 21 is connected to the fourth port of the air reversing valve 13 through the second air/flue gas pipeline 24; the second gas regenerator 20 is connected to the second gas/flue gas pipeline 25. The fourth port of the gas reversing valve (8) is connected;

The second premix chamber 39 is arranged in the furnace body and corresponds to the position of the second regenerative burner 19. One port of the supplementary combustion air quick-cut valve 18 is connected, and the other port of the second supplementary combustion air quick-cut valve 18 is connected with one end of the secondary supplementary combustion main pipeline 28 .

Preferably, ceramic heat storage balls or honeycomb ceramic heat storage bodies are placed in the first gas heat storage chamber 2 , the first air heat storage chamber 3 , the second gas heat storage chamber 20 and the second air heat storage chamber 21 .

Preferably, the second end of the gas reversing valve 8 is sequentially connected to the gas flow meter 9, the electric gas flow regulating valve 10 and the gas source 36 through the gas pipeline 29, and the third port of the gas reversing valve 8 is connected through The gas exhaust pipe 30 is sequentially connected with the gas exhaust electric regulating valve 12 and the gas exhaust fan 35 , and the gas exhaust pipeline 30 is provided with a gas exhaust temperature sensor 11 .

Preferably, the second port of the air reversing valve 13 is sequentially connected with the air flow meter 14, the electric air flow regulating valve 15 and the air smoke assisting fan 34 through the air pipe 31, and the third port of the air reversing valve 13 The air smoke exhaust pipe 32 is sequentially connected with the air smoke exhaust electric regulating valve 17 and the air smoke exhaust fan 33 , and the air smoke exhaust pipe 32 is provided with an air smoke exhaust temperature sensor 16 .

Preferably, the other end of the secondary supplementary combustion main pipeline 28 is sequentially connected with the secondary supplementary combustion air flow meter 6 , the secondary supplementary combustion air flow electric regulating valve 7 and the secondary supplementary combustion air blower 37 .

Preferably, the air reversing valve 13, the air flow electric regulating valve 15, the air smoke exhaust electric regulating valve 17, the gas flow electric regulating valve 10, the gas reversing valve 8, the gas The smoke exhaust electric control valve 12, the secondary secondary combustion air flow electric control valve 7, the first supplementary combustion air quick-cut valve 5 and the second supplementary combustion air quick-cut valve 18 are electromagnetic valves, electric valves and Any of the pneumatic valves.

Preferably, a furnace temperature monitoring point 23 is provided on the top of the furnace body or on the side of the furnace body.

It can be seen from the above that the regenerative non-oxidation heating furnace in the utility model is equipped with regenerative combustion devices on both sides of the furnace body, which can alternately heat and store the air and gas that are about to enter the furnace for combustion at the same time on both sides, greatly improving Heat utilization rate. At the same time, the original supplementary combustion measures are retained, which can effectively and accurately control the air-fuel ratio in the furnace, realize the heating of the reducing atmosphere, and at the same time ensure that the energy in the flue gas with an excess air coefficient less than 1 is not wasted. On the premise of realizing non-oxidation heating, the utilization rate of heat energy is further improved, the application of low calorific value fuel in the field of strip heat treatment is realized, and a new energy-saving regenerative non-oxidation heating technology is created.

Description of drawings

Fig. 1 is a schematic structural view of the regenerative non-oxidation heating furnace in the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the utility model are used to explain the utility model, but not as a limitation to the utility model.

Referring to Fig. 1, it is a schematic structural diagram of a regenerative non-oxidation heating furnace in this embodiment, which includes: a furnace body, a first regenerative burner 1, a first premixing chamber 38, a second Two regenerative burners 19 and a second premix chamber 39, wherein

The first regenerative burner 1 is arranged on one side of the furnace body. The first regenerative burner 1 is equipped with a first air regenerator 3 and a first gas regenerator 2, wherein the first air regenerator The chamber 3 is connected to the first port of the air reversing valve 13 through the first air/flue gas pipe 27, and the second port of the air reversing valve 13 is connected to the air flow meter 14 and the air flow electric regulating valve 15 in turn through the air pipe 31 It is connected with the air smoke-assisting fan 34, and the third port of the air reversing valve 13 is connected with the air smoke electric regulating valve 17 and the air smoke exhaust fan 33 in turn through the air smoke exhaust pipe 32, and on the air smoke exhaust pipe 32 An air exhaust temperature sensor 16 is provided; the first gas regenerator 2 is connected to the first port of the gas reversing valve 8 through the first gas/flue gas pipeline 26, and the second port of the gas reversing valve 8 passes through the gas The pipeline 29 is connected with the gas flowmeter 9, the electric gas flow regulating valve 10 and the gas source 36 in turn, and the third port of the gas reversing valve 8 is connected with the electric gas regulating valve 12 and the gas exhaust pipe 30 in sequence. The smoke fan 35 is connected, and the gas exhaust pipe 30 is provided with a gas exhaust temperature sensor 11;

The first premix chamber 38 is arranged in the furnace body and corresponds to the position of the first regenerative burner 1 . One port of the quick-cut valve 5 is connected, and the other port of the first supplementary combustion air quick-cut valve 5 is electrically regulated with the secondary supplementary combustion air flow meter 6 and the secondary supplementary combustion air flow through the secondary supplementary combustion main pipeline 28 in turn. The valve 7 is connected with the secondary supplementary combustion air blower 37;

The second regenerative burner 19 is arranged on the other side of the furnace body. The second regenerative burner 19 is equipped with a second air regenerator 21 and a second gas regenerator 20, wherein the second air The regenerator 21 is connected to the fourth port of the air reversing valve 13 through the second air/flue gas pipeline 24; The fourth port connection;

The second premix chamber 39 is arranged in the furnace body and corresponds to the position of the second regenerative burner 19. The upper part of the second premix chamber 39 communicates with the second supplementary combustion air fast One port of the cut valve 18 is connected, and the other port of the second supplementary combustion air quick cut valve 18 is connected with the secondary supplementary combustion main pipeline 28, that is, one end of the secondary supplementary combustion main pipeline 28 is connected with the first supplementary combustion air respectively. The quick-cut valve 5 is connected to the second supplementary combustion air quick-cut valve 18, and the other end of the secondary supplementary combustion main pipeline 28 is connected to the secondary supplementary combustion air flowmeter 6, and the fluid circuit is periodically switched by adopting electrical automation control , to precisely control the flow of air and gas.

In this embodiment, ceramic heat storage balls or honeycomb ceramic heat storage body.

The air reversing valve 13, air flow electric regulating valve 15, air smoke exhaust electric regulating valve 17, gas flow electric regulating valve 10, gas reversing valve 8, gas smoke electric regulating valve 12, secondary supplementary combustion air flow electric The regulating valve 7, the first supplementary combustion air quick-cut valve 5, and the second supplementary combustion air quick-cut valve 18 are any one of electromagnetic valves, electric valves and pneumatic valves. For example, the air reversing valve 13 can be selected as an air two-position four-way reversing valve, and the gas reversing valve 8 can be selected as a gas two-position four-way reversing valve.

In order to effectively monitor the temperature in the furnace body, in this embodiment, a furnace temperature monitoring point 23 may also be provided on the top of the furnace body or on the side of the furnace body.

It can be seen from the above that the regenerative non-oxidation heating furnace in the utility model is equipped with regenerative combustion devices on both sides of the furnace body, which can alternately heat and store the air and gas that are about to enter the furnace for combustion at the same time on both sides, greatly improving The utilization rate of heat energy retains the original supplementary combustion measures, which can effectively and accurately control the air-fuel ratio in the furnace to achieve heating in the reducing atmosphere, and at the same time ensure that the energy in the flue gas with an excess air coefficient less than 1 is not wasted.

On the premise of realizing non-oxidation heating, the utilization rate of heat energy is further improved, the application of low calorific value fuel in the field of strip heat treatment is realized, and a new energy-saving regenerative non-oxidation heating technology is created.

The practical technology will be described in detail below with reference to the accompanying drawings: when working, the first regenerative burner 1 on the A side and the second regenerative burner 19 on the B side work alternately in the combustion and heat storage states respectively. When the first regenerative burner 1 on the A side is burning, the air reversing valve 13 communicates the air duct 31 on the A side with the first air/flue gas duct 27; Two air/flue gas pipes 24 communicate;

At the same time, the gas reversing valve 8 communicates the gas pipeline 29 on the A side with the first gas/flue gas pipeline 26 ; At this time, the air is pressurized by the blower and passes through the air flow electric regulating valve 15 to control the flow rate, then passes through the air flow meter 14 to monitor, passes through the air reversing valve 13, then passes through the first air/flue gas pipe 27 on the A side, and passes through the A side The first air heat storage chamber 3 heats (radiates heat) the air, and the hot air reaches the first premix chamber 38 on the A side.

The flow of gas is controlled by the gas flow electric regulating valve 10, monitored by the gas flow meter 9, passed through the gas reversing valve 8, passed through the first gas/flue gas pipeline 26 on the A side, and passed through the first gas heat storage burner on the A side 2 gas is mixed and burned. Because both air and gas can be controlled precisely, favorable conditions are created to ensure the control of the reducing atmosphere in the furnace.

At the same time, the second supplementary combustion air quick-cut valve 18 on the B side is opened; the first supplementary combustion air quick-cut valve 5 on the A side is closed; The electric regulating valve 7 controls the flow rate, and is monitored by the secondary combustion air flowmeter 6, the secondary combustion air quick-cut valve 18 on the B side, and the supplementary combustion air supplied by the secondary combustion air pipeline 22 on the B side and The excess gas in the flue gas coming from the furnace is completely burned here, and the burned high-temperature flue gas passes through the second air/flue gas pipeline 24 and the second The gas/flue gas pipeline 25 passes through the gas reversing valve 8 and the air reversing valve 13, passes through the gas exhaust pipeline 30 and the air exhaust pipeline 32, passes through the air smoke exhaust electric control valve 17 and the gas smoke exhaust electric control valve 12, Exhausted by the smoke exhaust fan, the combustion of the first regenerative burner 1 on the A side and the heat storage of the second regenerative burner 19 on the B side are realized (the heat storage is divided into air heat storage and gas heat storage).

When the second regenerative burner 19 on the B side is burning, the air reversing valve 13 communicates the air duct 31 on the B side with the second air/flue gas duct 24, and sends air into the The second premixing chamber 39, at the same time, the gas reversing valve 8 communicates the gas pipeline 29 with the second gas/flue gas pipeline 25, and the gas is sent into the second premixing chamber 39 through the second gas regenerator 20, Premixed combustion, at this time, the flue gas passes through the first air regenerator 3 and the first gas regenerator 2, and then the air reversing valve 13 communicates the air exhaust pipe 32 with the first air/flue gas pipe 27; at the same time, the gas The reversing valve 8 communicates the gas smoke exhaust pipe 30 with the first gas/flue gas pipeline 26, passes through the air smoke exhaust electric control valve 17 and the gas smoke exhaust electric control valve 12, and discharges through the smoke exhaust fan. In this way, the combustion of the second regenerative burner 19 on the B side is realized, and the heat storage of the first regenerative burner 1 on the A side (the heat storage is divided into air heat storage and gas heat storage). At this time, the first heat storage burner 1 on the A side The first supplementary combustion air quick cut valve 5 is opened, the second supplementary combustion air quick cut valve 18 on the B side is closed, the secondary supplementary combustion air passes through the secondary supplementary combustion air flow electric regulating valve 7, and passes through the secondary supplementary combustion air flow meter 6 , through the first post-combustion air pipeline 4, the post-combustion air is mixed with the residual gas of flue gas in the furnace and completely burned. The high-temperature flue gas after burning is stored in the air and gas regenerator, and then discharged through the exhaust pipe.

Such a cycle ends, and the next cycle begins; the cycle repeats, and the exhaust gas temperature changes periodically between 120 and 180°C, realizing the process of heat storage and heat release. Before work, the furnace temperature is raised to 800°C by the set oven burner before the regenerative burner can be started for combustion, and the reversing valves are controlled in a timely manner through the computer; the secondary combustion air quick-cut valve realizes timing reversing and constant temperature Reversing; realize the best recovery of flue gas heat energy, and control the air flow electric regulating valve through precise calculation by computer; the gas flow electric regulating valve realizes the best air-fuel ratio.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present utility model.

Claims (7)

1. A regenerative non-oxidation heating furnace, characterized in that, comprising: Furnace body; The first regenerative burner (1) is arranged on one side of the furnace body, and the first regenerative burner (1) is equipped with a first air regenerator (3) and a first gas regenerator ( 2), wherein the first air regenerator (3) is connected to the first port of the air reversing valve (13) through the first air/flue gas pipeline (27); the first gas regenerator (2 ) is connected to the first port of the gas reversing valve (8) through the first gas/flue gas pipeline (26); The first premixing chamber (38) is arranged in the furnace body and corresponds to the position of the first regenerative burner (1). The upper part of the first premixing chamber (38) is The air pipeline (4) is connected to one port of the first supplementary combustion air quick-cut valve (5), and the other port of the first supplementary combustion air quick-cut valve (5) is connected to the secondary supplementary combustion main pipeline (28). One end connection; The second regenerative burner (19) is arranged on the other side of the furnace body, and the second regenerative burner (19) is equipped with a second air regenerator (21) and a second gas regenerator (20), wherein, the second air regenerator (21) is connected to the fourth port of the air reversing valve (13) through the second air/flue gas pipeline (24); The hot chamber (20) is connected to the fourth port of the gas reversing valve (8) through the second gas/flue gas pipeline (25); The second premixing chamber (39) is arranged in the furnace body and corresponds to the position of the second regenerative burner (19). The air pipeline (22) is connected to one port of the second supplementary combustion air quick-cut valve (18), and the other port of the second supplementary combustion air quick-cut valve (18) is connected to the secondary supplementary combustion main pipeline (28 ) is connected at one end. 2. The regenerative non-oxidation heating furnace according to claim 1, characterized in that, the first gas regenerator (2), the first air regenerator (3), the second gas regenerator ( 20) and the second air heat storage chamber (21) are placed with ceramic heat storage balls or honeycomb ceramic heat storage bodies. 3. The regenerative non-oxidation heating furnace according to claim 2, characterized in that, the second end of the gas reversing valve (8) is sequentially connected with the gas flow meter (9), the gas flow meter (9) through the gas pipeline (29). The flow electric control valve (10) is connected to the gas source (36), and the third port of the gas reversing valve (8) is connected to the gas control valve (12) and the gas exhaust pipe (30) in sequence. The exhaust fan (35) is connected, and the gas exhaust pipe (30) is provided with a gas exhaust temperature sensor (11). 4. The regenerative non-oxidation heating furnace according to claim 3, characterized in that, the second port of the air reversing valve (13) is sequentially connected with the air flow meter (14), air The flow electric regulating valve (15) is connected with the air smoke-assisted fan (34), and the third port of the air reversing valve (13) is connected with the air smoke electric regulating valve (17) and the air smoke exhaust pipe (32) successively. The air exhaust fan (33) is connected, and the air exhaust pipe (32) is provided with an air exhaust temperature sensor (16). 5. The regenerative non-oxidizing heating furnace according to claim 4, characterized in that, the other end of the secondary supplementary combustion main pipeline (28) is sequentially connected with the secondary supplementary combustion air flow meter (6), the secondary The electric regulating valve (7) of supplementary combustion air flow is connected with the secondary supplementary combustion air blower (37). 6. The regenerative non-oxidation heating furnace according to claim 5, characterized in that the air reversing valve (13), the air flow electric regulating valve (15), the air smoke exhaust electric regulating valve (17), the gas flow electric regulating valve (10), the gas reversing valve (8), the gas smoke exhaust electric regulating valve (12), the secondary secondary combustion air flow electric regulating valve (7 ), the first supplementary combustion air quick-cut valve (5) and the second supplementary combustion air quick-cut valve (18) are any one of solenoid valves, electric valves and pneumatic valves. 7. The regenerative non-oxidation heating furnace according to claim 6, characterized in that a furnace temperature monitoring point (23) is provided on the top of the furnace body or on the side of the furnace body.

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