CN210506462U

CN210506462U - Direct-fired outer furnace for annealing furnace

Info

Publication number: CN210506462U
Application number: CN201921020039.4U
Authority: CN
Inventors: 李柏翰
Original assignee: Kunshan Zhengtongming Metal Co ltd
Current assignee: Kunshan Zhengtongming Metal Co ltd
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-05-12
Anticipated expiration: 2029-07-02

Abstract

The utility model relates to a direct-fired outer stove for annealing stove, including casing, heat recovery device, combustion system, confession combustion air system and confession gas system, heat recovery device detachably installs the outside at the casing, combustion system, confession combustion air system all are located the outside of casing with confession gas system, be equipped with the flue gas pipe in the casing, this flue gas union coupling is in heat recovery device, and the flue gas is discharged through the exhanst gas outlet after the heat recovery device cooling, heat recovery device supplies combustion air system through the cold combustion air pipe intercommunication of its upper end, and through the heat of its lower extreme combustion air union coupling combustion system, this combustion system connects confession gas system. The utility model discloses in dispose a heat recovery device among every combustion system, adopt this kind of unique distributed heat recovery to form, can heat combustion air fully, increased substantially fuel combustion efficiency.

Description

Direct-fired outer furnace for annealing furnace

Technical Field

The utility model relates to an annealing stove, concretely relates to direct-fired outer stove for annealing stove.

Background

In the processing process of wires such as low carbon steel, medium carbon steel, low alloy steel and the like, spheroidizing annealing treatment is often needed, a spherical pearlite structure is obtained after the spheroidizing annealing treatment, and cementite is spherical particles and is dispersed and distributed on a ferrite matrix, and compared with the original flaky pearlite, the hardness is low, and the cutting processing is convenient. At present, a bell jar type spheroidizing annealing furnace is generally adopted, but the outer furnace of the annealing furnace at present has the defects of nonuniform heating, low combustion efficiency and the like.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides an outer stove of direct fire formula for annealing stove is equipped with a plurality of combustors and heat reclamation device in this outer stove, consequently can guarantee the homogeneity of interior heating of stove and improve combustion efficiency.

The utility model discloses a solve the technical scheme that its technical problem adopted and be:

the utility model provides a stove outside direct firing formula for annealing stove, includes casing, heat recovery device, combustion system, supplies combustion air system and supplies the gas system, heat recovery device detachably installs in the outside of casing, combustion system, supply combustion air system and supply the outside that the gas system all is located the casing, be equipped with the flue gas pipe in the casing, this flue gas union coupling is in heat recovery device, and the high temperature flue gas is discharged through the exhanst gas outlet after heat recovery device cools off, heat recovery device supplies combustion air system through the cold combustion air pipe intercommunication of its upper end, and the combustion system is connected through the heat combustion air pipe of its lower extreme, and this combustion system connects supply the gas system.

Preferably, 12 independent combustion systems are arranged, each combustion system is provided with a heat recoverer, the combustion systems are divided into an upper layer and a lower layer, 6 combustion systems are arranged on each layer, the combustion systems are uniformly distributed on the outer side of the shell along the circumferential direction of the lower portion of the shell, and the upper layer and the lower layer of combustion systems are designed at intervals.

Preferably, each combustion system comprises a low nitrogen oxide burner, an ignition rod and a UV flame monitor, a nozzle of the burner is fixed on the lower part of the shell, a flame spraying end of the nozzle is positioned on the inner side of the lower part of the shell, and a ceramic fiber heat insulation piece and a bracket thereof are arranged in the shell near the burner.

Preferably, the heat recovery device is a heat exchanger with a spiral pipe inside, cold combustion air passes through the spiral pipe, and high-temperature flue gas flows through the outside of the spiral pipe to heat the air in the spiral pipe.

Preferably, the combustion air supply system comprises an air blower, an air pipeline, a control valve and a driving motor, the air blower conveys external air to the heat recovery device for heating after passing through the air pipeline and being regulated by the control valve, and the driving motor is used for regulating the control valve.

Preferably, the gas supply system comprises a gas pipeline, a gas control valve and a quick gas joint, wherein the quick gas joint is used for connecting an external gas source, and the gas control valve is used for controlling proper gas flow.

Preferably, the gas combustion-supporting temperature monitoring device further comprises a control box and a thermometer, wherein the control box is installed on the outer side of the shell, a control system is arranged in the control box and used for controlling a combustion air supply system, a combustion system and a gas supply system, and the thermometer is located in the shell and used for monitoring the temperature in the shell.

Preferably, the shell is in a shape of a circular bell jar, a heat insulation layer is arranged on the inner side of the shell and is a ceramic fiber layer, an expansion joint is installed on the cold combustion air pipeline, and a heat insulation strip is arranged at the bottom of the shell.

The utility model has the advantages that: the utility model discloses in each combustion system dispose a heat recovery device, adopt this kind of unique distributed heat recovery to form, can heat combustion air fully, and the combustor adopts tangent type high impulse combustor, appropriate gas proportional control and combustor two-layer distribution, improved fuel combustion efficiency by a wide margin, simultaneously flue gas waste gas is reduced the temperature by a wide margin before discharging, simplified the flue gas treatment process; the utility model discloses in set up safety measure such as high temperature limiter, safe fusing valve and UV inductor detection flame, consequently the security performance is high, still has advantages such as the maintenance is simple, the heat-proof quality is good.

Drawings

FIG. 1 is an internal structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

in the figure: 10-shell, 11-insulating layer, 12-flue gas pipe, 13-insulating strip, 20-heat recoverer, 21-cold combustion air pipe, 22-heat combustion air pipe, 30-combustion system, 31-burner, 32-ignition rod, 40-combustion air supply system, 41-air blower, 42-air pipeline, 43-control valve, 44-driving motor, 50-gas supply system, 51-gas pipeline, 52-gas control valve, 53-fast gas joint, 60-control box and 61-thermometer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): as shown in fig. 1 and 2, a direct-fired external furnace for an annealing furnace includes a casing 10, a heat recovery unit 20, a combustion system 30, a combustion air supply system 40 and a gas supply system 50, wherein the heat recovery unit 20 is detachably installed at the outer side of the casing, the combustion system 30, the combustion air supply system 40 and the gas supply system 50 are all located at the outer side of the casing, a flue gas pipe 12 is arranged in the casing 10, the flue gas pipe 12 is connected to the heat recovery unit 20, high-temperature flue gas is cooled by the heat recovery unit and then discharged through a flue gas outlet, the heat recovery unit 20 is communicated with the combustion air supply system through a cold combustion air pipe 21 at the upper end thereof, the hot combustion air pipe 22 at the lower end thereof is connected with the combustion system 30, and the combustion system 30 is connected with the. During the use, outside gas gets into combustion system 30 through supplying gas system 50, and outside combustion air gets into through supplying combustion air system 40 and lies in the outside heat recovery device 20 of casing, and the high temperature flue gas of burning in the annealing stove gets into heat recovery device 20 through flue gas pipe 12 and heats cold combustion air, and the combustion air after being heated gets into combustion system auxiliary combustion through hot combustion air pipe 22, and the flue gas after being cooled passes through exhanst gas outlet and discharges to flue gas processing apparatus, the utility model discloses in a heat recovery device of configuration among every combustion system, adopt this kind of unique distributed heat recovery to form, can heat combustion air fully, increased substantially fuel combustion efficiency.

In the present embodiment, there are 12 independent combustion systems 30, each of which is equipped with a heat recovery device 20, the combustion systems are divided into an upper layer and a lower layer, and 6 combustion systems are arranged on each layer, the combustion systems are evenly distributed on the outer side of the casing along the circumferential direction of the lower part of the casing 10, and the upper and lower layers of combustion systems are designed to be spaced from each other. Each combustion system 30 comprises a low-nox burner 31, an ignition rod 32 and a UV flame monitor, the nozzle of the burner 31 being fixed to the lower part of the housing, the flame end of the nozzle being located inside the lower part of the housing, and a ceramic fiber thermal insulation and its support being provided in the housing in the vicinity of the burner. All combustion systems and heat recoverers share a set of combustion air supply system and gas supply system, the combustor 31 adopts tangent high impulse combustors, direct firing type gas fuel, proper gas proportion control, combustor two-layer distribution and each combustor is provided with a heat recoverer, and the fuel combustion efficiency is greatly improved.

The heat recovery device 20 is a heat exchanger having a spiral pipe inside, cold combustion air passes through the spiral pipe, and high-temperature flue gas flows through the outside of the spiral pipe to heat the air in the spiral pipe. The heat recovery device is a heat exchanger which preheats air by using waste flue gas after combustion, the preheated air is sent to a burner nozzle to be mixed with fuel gas and then combusted, and the temperature of the preheated air can reach about 300 ℃, so that the combustion efficiency is improved, fuel is saved, the temperature of the discharged flue gas is reduced, and the environmental pollution is reduced.

The combustion air supply system 40 comprises an air blower 41, an air pipeline 42, a control valve 43 and a driving motor 44, wherein the air blower 41 conveys external air to the heat recovery device 20 for heating after passing through the air pipeline and being regulated by the control valve, and the driving motor 44 is used for regulating the control valve 43.

The gas supply system 50 includes a gas pipe 51, a gas control valve 52, and a fast gas joint 53, the fast gas joint 53 is used for connecting an external gas source, and the gas control valve 52 is used for controlling a proper gas flow.

The shell 10 is in a shape of a circular bell jar, a heat insulation layer 11 is arranged on the inner side of the shell, the heat insulation layer is a ceramic fiber layer, an expansion joint is installed on the cold combustion air pipeline, and a heat insulation strip 13 is arranged at the bottom of the shell. The external furnace also comprises a control box 60 and a thermometer 61, wherein the control box 60 is installed on the outer side of the shell 10, a control system is arranged in the control box and used for controlling a combustion air supply system, a combustion system and a gas supply system, and the thermometer 62 is positioned in the shell and used for monitoring the temperature in the shell. Full-automatic control is realized by using the control system, and the whole process can be controlled by operating the PLC interface by an operator.

It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A direct-fired outer furnace for an annealing furnace, characterized in that: including casing (10), heat recovery device (20), combustion system (30), confession combustion air system (40) and confession gas system (50), heat recovery device (20) detachably installs in the outside of casing, combustion system (30), confession combustion air system (40) and confession gas system (50) all are located the outside of casing, be equipped with flue gas pipe (12) in casing (10), this flue gas pipe (12) are connected in heat recovery device (20), and the high temperature flue gas is discharged through the exhanst gas outlet after the heat recovery device cooling, heat recovery device (20) supply combustion air system through cold combustion air pipe (21) intercommunication of its upper end, connect combustion system (30) through heat combustion air pipe (22) of its lower extreme, and this combustion system (30) are connected confession gas system.

2. The direct fire type outer furnace for an annealing furnace according to claim 1, wherein: the combustion system is provided with 12 independent combustion systems (30), each combustion system is provided with a heat recoverer (20), the combustion systems are divided into an upper layer and a lower layer, 6 combustion systems are arranged on each layer, the combustion systems are uniformly distributed on the outer side of the shell along the circumferential direction of the lower part of the shell (10), and the upper layer and the lower layer of combustion systems are designed at intervals.

3. The direct fire type outer furnace for an annealing furnace according to claim 2, wherein: each combustion system (30) comprises a low nitrogen oxide burner (31), an ignition rod (32) and a UV flame monitor, wherein a nozzle of the burner (31) is fixed at the lower part of the shell, a flame spraying end of the nozzle is positioned at the inner side of the lower part of the shell, and a ceramic fiber heat insulation piece and a support thereof are arranged in the shell near the burner.

4. The direct fire type outer furnace for an annealing furnace according to claim 1, wherein: the heat recoverer (20) is a heat exchanger with a spiral pipe inside, cold combustion air passes through the spiral pipe, and high-temperature flue gas flows through the outside of the spiral pipe to heat the air in the spiral pipe.

5. The direct fire type outer furnace for an annealing furnace according to claim 1, wherein: the combustion air supply system (40) comprises an air fan (41), an air pipeline (42), a control valve (43) and a driving motor (44), wherein the air fan (41) conveys external air to the heat recovery device (20) for heating after passing through the air pipeline and being regulated by the control valve, and the driving motor (44) is used for regulating the control valve (43).

6. The direct fire type outer furnace for an annealing furnace according to claim 1, wherein: the gas supply system (50) comprises a gas pipeline (51), a gas control valve (52) and a quick gas joint (53), wherein the quick gas joint (53) is used for connecting an external gas source, and the gas control valve (52) is used for controlling proper gas flow.

7. The direct fire type outer furnace for an annealing furnace according to claim 1, wherein: the gas-fired boiler is characterized by further comprising a control box (60) and a thermometer (61), wherein the control box (60) is installed on the outer side of the shell (10), a control system is arranged in the control box and used for controlling a combustion air supply system, a combustion system and a gas supply system, and the thermometer (61) is located in the shell and used for monitoring the temperature in the shell.

8. The direct fire type outer furnace for an annealing furnace according to claim 1, wherein: the shell (10) is in a circular bell jar shape, a heat insulation layer (11) is arranged on the inner side of the shell and is a ceramic fiber layer, an expansion joint is installed on the cold combustion air pipeline, and a heat insulation strip (13) is arranged at the bottom of the shell.