CN214172941U

CN214172941U - Gas chamber type heating furnace

Info

Publication number: CN214172941U
Application number: CN202120135319.0U
Authority: CN
Inventors: 杜超; 杨文�
Original assignee: Sichuan Southwest Industrial Furnace Co ltd
Current assignee: Sichuan Southwest Industrial Furnace Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-09-10
Anticipated expiration: 2031-01-19

Abstract

The utility model provides a gas chamber type heating furnace, which comprises a furnace body, a furnace door, a smoke exhaust system and a burner, wherein the furnace body is provided with a furnace top, a side wall and a rear wall; the combustor is evenly arranged on the furnace top and consists of a combustion chamber of a front section and a gas distribution chamber of a rear section, the combustion chamber comprises a burner block and a refractory lining arranged in the burner block, and the gas distribution chamber is connected with a gas distribution device through an air-fuel pipeline. The utility model discloses a combustor with setting up evenly arranges on the furnace roof, can guarantee that the temperature in the furnace body is even, and the thermal efficiency is high, is favorable to protecting the burner block not burnt out simultaneously, and the burner adopts the component form of front and back section, and the burner block all can independently be dismantled and maintain, and it is convenient to change.

Description

Gas chamber type heating furnace

Technical Field

The utility model relates to a heating furnace equipment technical field, concretely relates to gas chamber formula heating furnace for heating titanium alloy.

Background

The chamber-type heating furnace is widely applied to the field of industrial production and is important production equipment in the industries of smelting, forging, manufacturing, heat treatment, drying and the like. In metallurgical industry, chamber-type heating furnaces are mainly used for heating metal blanks or ingots before forging and pressing, and are characterized in that workpieces are not moved during heating, the furnace is not segmented, and the furnace temperature is required to be uniform at each position. The fuel of the chamber-type heating furnace is coal, heavy oil or natural gas, and air required by combustion is sent by a fan.

At present, under the existing energy structure condition in China, a chamber type heating furnace taking gas and liquid fuel as furnace heat sources is widely applied. The burner of the existing gas chamber type heating furnace is arranged on the side wall of the furnace body, local high temperature is easily caused near the burner block, the burner is damaged, the replacement is inconvenient, the temperature in the furnace body is uneven, and the heat efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a not enough to prior art, the utility model aims at providing a gas chamber formula heating furnace to the combustor of solving current gas chamber formula heating furnace arranges on the side wall of furnace body, causes local high temperature near burner block easily, leads to the combustor to damage, and it is inconvenient to change, and the temperature in the furnace body is inhomogeneous moreover, the problem that the thermal efficiency is low.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a gas-fired chamber-type heating furnace comprising:

a furnace body having a furnace top, a side wall and a rear wall;

the furnace door is connected with the furnace body in a lifting way and is opposite to the rear wall;

the smoke exhaust system is connected with the rear wall through a pipeline and is communicated with the interior of the furnace body; and

a burner;

the burner is uniformly arranged on the furnace top and consists of a front-section combustion chamber and a rear-section gas distribution chamber, the combustion chamber comprises a burner block and a refractory lining arranged in the burner block, and the gas distribution chamber is connected with a gas distribution device through an air-fuel pipeline.

In one embodiment disclosed by the application, the burner block is divided into a flat flame burner block and a direct flame burner block, a burner formed by the flat flame burner block is a first burner, and the first burners are uniformly arranged in the middle of the furnace top and used as auxiliary heating; the burner formed by the direct flame burner block is a second burner which is symmetrical to the first burner and is uniformly arranged on two sides of the furnace top, and the second burner and the first burner are arranged in a staggered mode and used as main heating.

In an embodiment disclosed in the present application, a reflective slope corresponding to the second burner is disposed at the bottom of the inner wall of the side wall, and is used for changing the direction of the hot air flow ejected by the second burner.

In an embodiment disclosed in the present application, a furnace is arranged inside the furnace body, the furnace is divided into a plurality of heating zones with equal intervals and same size along the center of the furnace, and each heating zone comprises one first burner and four second burners.

In an embodiment disclosed in the present application, a thermocouple is installed on a side wall of each heating zone for monitoring a furnace temperature, and the thermocouples are symmetrically arranged with respect to the first burner and located in the same cross section as the first burner.

In one embodiment of the present disclosure, the thermocouples of each heating zone are arranged in pairs and are electrically connected to the control system respectively.

In one embodiment disclosed in the application, the smoke exhaust system mainly comprises a chimney, an automatic cold air mixing device, a cylindrical radiant heat exchanger and an electric turning plate, wherein the automatic cold air mixing device, the cylindrical radiant heat exchanger and the electric turning plate are sequentially arranged on the chimney; the automatic cold air mixing device comprises an air inlet sleeve sleeved on the chimney and a fan communicated with the air inlet sleeve, and the fan is fixedly installed on the ground.

In one embodiment disclosed in the present application, a micro differential pressure transmitter electrically connected to the control system is installed on the rear wall for measuring the furnace pressure.

In one embodiment disclosed in the application, the furnace door is connected with a lifting mechanism arranged above the furnace top through a roller chain, automatic pressing type guide wheels are arranged on two sides of the furnace door, and the automatic pressing type guide wheels are matched with guide wheel tracks obliquely connected to the front end face of the side wall; the two ends of the top of the furnace door are provided with rollers, and the rollers are matched with roller slideways arranged on the two sides of the lifting mechanism.

In one embodiment of the present disclosure, the lifting mechanism includes a door frame and a driving motor installed on a side of the door frame, the roller slideway is disposed on the door frame, and the driving motor is connected with the top of the door through the roller chain.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the burners are uniformly arranged on the furnace top, so that the temperature in the furnace body can be ensured to be uniform, the heat efficiency is high, the burner block can be protected from being burnt, the burners adopt a front-rear section composition form, the burner block can be independently detached and maintained, and the replacement is convenient;

2. the first burner and the second burner which are arranged on the furnace top in a staggered mode are used, and the direction of hot air flow sprayed out by the second burner is changed by utilizing the reflecting slope arranged at the bottom of the inner wall of the side wall, so that the atmosphere in the furnace is fully stirred, and the uniformity of the furnace temperature in the hearth is improved;

3. the thermocouples of each heating zone are arranged in pairs, one thermocouple is used for measuring temperature, the other thermocouple is used for controlling temperature, and the thermocouples are mutually referred, so that the accurate control of the furnace temperature can be realized;

4. the temperature of the flue gas entering the cylindrical radiation heat exchanger can be reduced through the automatic cold air mixing device, so that the cylindrical radiation heat exchanger is protected, and the service life of the cylindrical radiation heat exchanger is prolonged;

5. the automatic pressing type guide wheels are matched with the guide wheel tracks which are obliquely arranged, so that the running stability of the furnace door during frequent opening, charging and discharging at high temperature is guaranteed, the furnace door is tightly pressed on the furnace body under the action of the gravity of the furnace door during closing, and the furnace door is guaranteed not to rub with the furnace opening during opening and closing.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic top view of the present invention;

fig. 3 is a left side view structure diagram of the present invention.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, the utility model provides a gas chamber type heating furnace, which comprises:

a furnace body 10 having a furnace top 11, side walls 12 and a rear wall 13;

the furnace door 20 is connected with the furnace body 10 in a lifting way and is opposite to the rear wall 13;

a smoke exhaust system 30 connected to the rear wall 13 through a pipe and communicating with the inside of the furnace body 10; and

a burner 40;

the burners 40 are uniformly arranged on the furnace top 11 and are composed of a front-segment combustion chamber and a rear-segment gas distribution chamber, the combustion chamber comprises a burner block and a refractory lining arranged in the burner block, and the gas distribution chamber is connected with a gas distribution device through an air-fuel pipeline.

The burners 40 are uniformly arranged on the furnace top 11, so that the temperature in the furnace body can be ensured to be uniform, the heat efficiency is high, the burner blocks can be protected from being burnt out, the burners 40 adopt a front section and a rear section, the burner blocks can be independently detached and maintained, and the replacement is convenient.

The burner block is divided into a flat flame burner block and a direct flame burner block, a burner formed by the flat flame burner block is a first burner 41, and the first burner 41 is uniformly arranged in the middle of the furnace top 11 and used as auxiliary heating; the burner formed by the direct flame burner block is a second burner 42, the second burner 42 is symmetrical to the first burner 41 and is uniformly arranged on two sides of the furnace top 11 and staggered with the first burner 41, and the second burner 42 is an ultra-high speed burner and is used as main heating.

The bottom of the inner wall of the side wall 12 is provided with a reflecting slope corresponding to the second burner 42, and is used for changing the direction of the hot air flow sprayed by the second burner 42.

Referring to fig. 2, a furnace body 10 is provided therein, and the furnace body is divided into a plurality of heating zones with equal intervals and same size along the center thereof, wherein each heating zone comprises a first burner 41 and four second burners 42.

Specifically, high-temperature and high-speed hot air flow is sprayed out from the second burners 42, vertically downward, the direction of the hot air flow is changed by 90 degrees through the reflecting slope, and then the hot air flow enters the heating zones, and the two second burners 42 in each heating zone are reasonably arranged through time sequence pulses, so that convection of furnace atmosphere can be strengthened, and the uniformity of furnace temperature is improved.

The first burner 41 and the second burner 42 are electrically connected with the burner controller, the electric butterfly valve, the electromagnetic pulse valve, the ignition transformer and the gas regulating valve through a control system to jointly form a combustion system. The combustion system is controlled by a special intelligent combustion controller which takes Siemens S7-300PLC as a core, and can realize automatic/manual control of the whole process of automatic ignition, large and small flame adjustment and switching, flameout alarm, flameout protection, reignition and the like. The burner nozzles are used for pulse time sequence combustion, so that the furnace atmosphere can be fully stirred, and the uniformity of the furnace atmosphere is improved to the greatest extent; meanwhile, a large-proportion pulse combustion control mode is adopted, and three flames (big fire, small fire and flameout) of the burner are controlled by an electric three-position (big, small and fully closed) butterfly valve, so that the accurate control of the furnace temperature can be realized. The change of the air pressure in front of the burner nozzle adjusts the natural gas amount through a proportion adjusting valve arranged on a natural gas pipeline, and the effective air-fuel ratio can be realized.

The side wall 12 of each heating zone is provided with a thermocouple 50 for monitoring the furnace temperature, and the thermocouples 50 are symmetrically arranged relative to the first burner 41 and are positioned in the same cross section with the first burner 41.

The thermocouples 50 of each heating zone are arranged in pairs and are respectively electrically connected with the control system; one is used for temperature measurement, the other is used for temperature control, and the mutual reference can realize the accurate control of the furnace temperature.

Specifically, the control system mainly comprises a Siemens S7-1500PLC, an European land 3504 intelligent regulator and an industrial personal computer, process variables (process parameters such as heating zone temperature, exhaust gas temperature, hot air temperature and pressure, natural gas pressure and flow, furnace pressure and the like and burner combustion state information) are collected and enter an HMI, and all control information is managed by the HMI.

The control system is arranged in two parts, one part (basic automation level: ET 200M) is arranged on site, and the other part (main control level: industrial personal computer, PLC host and intelligent regulator) is arranged in a central control room.

And each burner is provided with a manual and automatic control box on site so as to realize the switching of the burners to manually control big fire, small fire, flameout and reset on site.

The control system has three control modes of 'computer', 'instrument' and 'manual':

1. in the state of 'computer', an intelligent regulator in Europe 3504 is used as a main control table to form a closed-loop automatic control system together with Siemens S7-1500PLC and an industrial personal computer, and the parameter setting is completed on the picture of the industrial personal computer;

2. if the computer fails, the work of the whole system is not influenced, and the parameter setting can be directly operated on the instrument;

3. if the 'instrument' also breaks down, the burner can be switched to manual control in a field 'manual' control box to realize emergency control, so that a 'computer' and 'manual' two-stage temperature control mode is realized.

Therefore, the industrial personal computer, the PLC, the intelligent regulator and the combustion system form a temperature closed-loop control system, the intelligent regulator and the PLC acquire field signals and compare the field signals with set values, and then output regulating signals to control the burners to realize pulse combustion through the PLC, so that the temperature is automatically controlled.

The smoke exhaust system 30 mainly comprises a chimney 31, a cylindrical radiant heat exchanger 32 and an electric turning plate 33, wherein the cylindrical radiant heat exchanger 32 and the electric turning plate 33 are sequentially arranged at the upper end of the chimney 31, and the electric turning plate 33 is electrically connected with a control system. In order to protect the cylindrical radiation heat exchanger 32 and prolong the service life of the cylindrical radiation heat exchanger, an automatic cold air mixing device is arranged on the chimney 31 below the cylindrical radiation heat exchanger 32, the automatic cold air mixing device comprises an air inlet sleeve 34 and a fan 35, the air inlet sleeve 34 is sleeved on the chimney 31, the fan 35 is communicated with the air inlet sleeve 34, and the fan 35 is fixedly installed on the ground.

Specifically, flue gas generated after natural gas in the hearth is combusted enters the chimney 31 through the rear wall 13, the fan 35 is started to be doped with cold air, the flue gas is cooled for the first time and then is subjected to heat exchange through the cylindrical radiation heat exchanger 32, the flue gas is discharged to the atmosphere through the chimney after being cooled again, hot air subjected to heat exchange and temperature rise enters the burner and enters the hearth together with the fuel gas to participate in combustion, the purpose of recycling waste heat of the flue gas is achieved, the supply of the fuel gas is effectively reduced, and the national policy of energy conservation and emission reduction is met.

In order to ensure the stability of the furnace pressure in the hearth, a micro differential pressure transmitter 60 electrically connected with the control system is installed on the rear wall 13 and used for measuring the hearth pressure. The opening degree of the electric turning plate 33 is automatically adjusted according to the hearth pressure (controlled within the range of micro-positive pressure of 10-50 Pa, and instantaneously fluctuates by +/-50 Pa), so that the furnace temperature is more uniform.

The furnace door 20 is connected with a lifting mechanism 70 arranged above the furnace top 11 through a roller chain, two sides of the furnace door 20 are provided with automatic pressing type guide wheels 21, and the automatic pressing type guide wheels 21 are matched with guide wheel tracks 14 obliquely connected to the front end surfaces of the side walls 12; the two ends of the top of the oven door 20 are provided with rollers 22, and the rollers 22 are matched with roller slideways 71 arranged at two sides of the lifting mechanism 70. The automatic pressing type guide wheels 21 are matched with the guide wheel tracks 14 which are obliquely arranged, so that the running stability of the furnace door 20 during frequent opening, charging and discharging at high temperature is ensured, the furnace door 20 is pressed on the furnace body 10 under the action of the gravity of the furnace door 20 during closing to be tightly sealed, and meanwhile, the furnace door 20 is ensured not to rub with a furnace opening during opening and closing.

The lifting mechanism 70 comprises a furnace door frame 72 and a driving motor 73 arranged on the side surface of the furnace door frame 72, the roller slideway 71 is arranged on the furnace door frame 72, and the driving motor 73 is connected with the top of the furnace door 20 through a roller chain. The driving motor 73 adopts an integrated motor reducer and is matched with a variable-frequency speed regulator to realize the starting, the quick, the slow and the stop of the furnace door, thereby ensuring the safety and the reliability.

The main structure of the furnace body 10 is a metal frame which is formed by welding profile steels, and a steel plate with the thickness of 5mm is laid outside, so that the furnace shell is ensured to have good rigidity. The furnace roof 11 is a flat-top structure, a furnace lining is assembled by adopting refractory fibers, the total thickness of fiber layers is 400mm, and the zirconium-containing refractory fiber modules are fixed on a furnace shell steel plate by adopting heat-resistant steel anchoring pieces made of Cr25Ni 20. The fire-resistant layers on the upper parts of the side walls 12 and the rear wall 13 are built by hollow high-aluminum light-weight polymer bricks, and the heat-insulating layer is made of a flat fiber blanket; the lower fire-resistant layers of the side walls 12 and the rear wall 13 are integrally cast by high-temperature low-cement castable, and the heat-insulating layer is built by two layers of light-weight-gathering bricks; fiber blankets are laid on the surfaces of the steel plates on the outermost heat insulation layers of the side walls 12 and the rear wall 13. The bottom of the furnace is filled with light insulating bricks, the surface of the hearth is laid by high-alumina bricks in a dry manner, the periphery of the furnace door is in a castable structure, the surface is flat and smooth, an expansion gap is reserved between the castable and the furnace lining, the inside and the outside are staggered, and high-temperature-resistant zirconium-containing fibers are filled in the expansion gap to ensure that fire and gas channeling do not occur between the expansion gaps and facilitate future maintenance.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.

Claims

1. A gas-fired chamber-type heating furnace, comprising:

a furnace body having a furnace top, a side wall and a rear wall;

a burner;

2. The gas chamber furnace according to claim 1, wherein the burner blocks are divided into flat flame burner blocks and direct flame burner blocks, a burner formed by the flat flame burner blocks is a first burner, and the first burner is uniformly arranged in the middle of the furnace top and used as auxiliary heating; the burner formed by the direct flame burner block is a second burner which is symmetrical to the first burner and is uniformly arranged on two sides of the furnace top, and the second burner and the first burner are arranged in a staggered mode and used as main heating.

3. The gas chamber furnace of claim 2, wherein the bottom of the inner wall of the side wall is provided with a reflecting slope corresponding to the second burner for changing the direction of the hot air flow jetted by the second burner.

4. The gas-fired chamber heating furnace according to claim 2 or 3, wherein a hearth is arranged in the furnace body, the hearth is divided into a plurality of heating zones with equal intervals and same size along the center of the hearth, and each heating zone comprises one first burner and four second burners.

5. The gas-fired chamber furnace according to claim 4, wherein a thermocouple is mounted on a side wall of each heating zone for monitoring the furnace temperature, the thermocouples being symmetrically arranged with respect to the first burner and being in the same cross section as the first burner.

6. The gas-fired chamber heater according to claim 5, wherein the thermocouples of each heating zone are arranged in pairs and are electrically connected to the control system.

7. The gas-fired chamber furnace according to claim 1, wherein the smoke exhaust system mainly comprises a chimney, and an automatic cold air mixing device, a cylindrical radiant heat exchanger and an electric turning plate which are sequentially arranged on the chimney, wherein the electric turning plate is electrically connected with a control system; the automatic cold air mixing device comprises an air inlet sleeve sleeved on the chimney and a fan communicated with the air inlet sleeve, and the fan is fixedly installed on the ground.

8. The gas-fired chamber furnace according to claim 1 or 7, wherein a micro differential pressure transmitter electrically connected to a control system is installed on the back wall for measuring the furnace pressure.

9. The gas chamber type heating furnace according to claim 1, wherein the furnace door is connected with a lifting mechanism installed above the furnace top through a roller chain, automatic pressing type guide wheels are arranged on two sides of the furnace door and matched with guide wheel tracks obliquely connected to the front end face of the side wall; the two ends of the top of the furnace door are provided with rollers, and the rollers are matched with roller slideways arranged on the two sides of the lifting mechanism.

10. The gas-fired chamber-type heater of claim 9, wherein the lifting mechanism includes a door frame and a drive motor mounted on a side of the door frame, the roller runner being provided on the door frame, the drive motor being connected to the top of the door by the roller chain.