阅读说明：本技术 一种低温纯氧燃烧熔铝炉用炉压自动调节机构及调节方法 (Automatic furnace pressure adjusting mechanism and method for low-temperature pure oxygen combustion aluminum melting furnace ) 是由 任玉波 董帅 董杰 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种低温纯氧燃烧熔铝炉用炉压自动调节机构及调节方法,该炉压自动调节机构包括闸板、杠杆、平衡配重块、气缸、压力传感器、电磁阀以及控制器；杠杆套设于烟道外部的支撑轴的一端固定连接有闸板,另一端悬挂有平衡配重块；压力传感器与控制器电连接,控制器与电磁阀电连接,电磁阀与气缸电连接,气缸与杠杆远离闸板的一端相连接；烟道侧壁上开设有凹槽,当炉内压力大于50pa时,闸板与平衡配重块处于转动平衡状态,高压气体的冲击使闸板绕支撑轴转动而使烟道快速打开一开度,炉内压力下降,气缸的动作使闸板绕支撑轴转动以细微调整烟道的开度使炉内保持稳定。利用该机构可快速高效的调节炉内压力,进而使熔铝炉炉内压力稳定在1-20Pa。(The invention discloses a furnace pressure automatic regulating mechanism and a regulating method for a low-temperature pure oxygen combustion aluminum melting furnace, wherein the furnace pressure automatic regulating mechanism comprises a flashboard, a lever, a balance weight block, an air cylinder, a pressure sensor, an electromagnetic valve and a controller; one end of the supporting shaft, which is sleeved outside the flue by the lever, is fixedly connected with a flashboard, and the other end of the supporting shaft is hung with a balancing weight block; the pressure sensor is electrically connected with the controller, the controller is electrically connected with the electromagnetic valve, the electromagnetic valve is electrically connected with the air cylinder, and the air cylinder is connected with one end of the lever, which is far away from the flashboard; the groove is formed in the side wall of the flue, when the pressure in the furnace is larger than 50pa, the flashboard and the balancing weight block are in a rotating balance state, the flashboard rotates around the supporting shaft due to the impact of high-pressure gas to enable the flue to be opened by an opening degree quickly, the pressure in the furnace is reduced, and the action of the cylinder enables the flashboard to rotate around the supporting shaft to finely adjust the opening degree of the flue so that the furnace is kept stable. The pressure in the furnace can be quickly and efficiently adjusted by using the mechanism, so that the pressure in the aluminum melting furnace is stabilized at 1-20 Pa.)

1. The utility model provides a low temperature pure oxygen burning melts aluminium stove and carries out furnace pressure adjustment with the help of locating the outside flue that communicates through the exhaust port with furnace of melting aluminium stove, its characterized in that: the hydraulic control valve comprises a flashboard (1), a lever (7), a balancing weight block (4), a cylinder (6), a pressure sensor (2), an electromagnetic valve (5) and a controller (3);

one end of the lever (7) is sleeved on a supporting shaft (8) outside the flue and can rotate around the supporting shaft (8), one end of the lever (7) sleeved on the supporting shaft (8) is fixedly connected with a flashboard (1) which extends into the flue and is used for controlling the opening and closing of the flue, and one end of the lever (7) far away from the flashboard (1) is vertically suspended with a balancing weight block (4) used for balancing the flashboard (1);

the pressure sensor (2) is arranged at the top of the aluminum melting furnace, the pressure sensor (2) is electrically connected with the controller (3), the controller (3) is electrically connected with the electromagnetic valve (5), the electromagnetic valve (5) is electrically connected with the cylinder (6), and the cylinder (6) is connected with one end, away from the flashboard (1), of the lever (7);

a groove is formed in the side wall of the flue, under an initial condition, the flashboard (1) is horizontally supported on the side wall of the groove to close the flue, and the flashboard (1) and the balancing weight block (4) are in a static balance state; when high-pressure gas with pressure greater than 50Pa is discharged into the flue through the exhaust port, the flashboard (1) and the balancing weight block (4) are in a rotation balance state, the impact of the high-pressure gas can cause the flashboard (1) to rotate around the supporting shaft (8) so that the flue is opened by an opening degree quickly, the pressure in the furnace is reduced along with the discharge of the high-pressure gas, and the action of the cylinder (6) can drive the flashboard (1) to rotate around the supporting shaft (8) so that the pressure in the furnace is stabilized at 1-20Pa by finely adjusting the opening degree of the flue.

2. The furnace pressure automatic regulating mechanism for the low-temperature pure oxygen combustion aluminum melting furnace according to claim 1, characterized in that: the lever (7) comprises an annular part and a bending part fixedly connected with the annular part, the annular part can be sleeved on the supporting shaft (8), and the balancing weight block (4) is arranged at one end, far away from the annular part, of the bending part.

3. The furnace pressure automatic regulating mechanism for the low-temperature pure oxygen combustion aluminum melting furnace according to claim 2, characterized in that: when flashboard (1) is the horizontality, the kink upwards extends along the direction slope of keeping away from the flue, be 100~180 contained angles between kink and flashboard (1).

4. The automatic furnace pressure regulating mechanism of the low-temperature pure oxygen combustion aluminum melting furnace according to claim 1, characterized in that: the controller (3) can control the air cylinder (6) to react after the balancing weight block (4) acts for 1-5 min.

5. A method for automatically adjusting furnace pressure of a low-temperature pure oxygen combustion aluminum melting furnace is characterized by comprising the following steps: the furnace pressure is adjusted by discharging high-pressure gas in an aluminum melting furnace to the outside of the furnace through the furnace pressure automatic adjusting mechanism in claim 1, under the initial condition, a flashboard (1) is horizontally supported on the side wall of a groove to close a flue, and the flashboard (1) and a balancing weight block (4) are in a static balance state; when the pressure in the aluminum melting furnace is more than 50pa, high-pressure gas is discharged into a flue from a smoke outlet in the furnace, the flashboard (1) and the balancing weight block (4) are in a rotating balance state, the flashboard (1) impacted by the high-pressure gas rotates around the support shaft (8) to enable the flue to be opened by an opening degree rapidly so as to realize coarse adjustment of the pressure in the furnace, and the high-pressure gas is discharged into the furnace through the flue and the pressure in the furnace is basically stable; and then the controller (3) controls the cylinder (6) to act through the electromagnetic valve (5) according to the received signal of the pressure sensor (2) so that the gate plate (1) rotates around the supporting shaft (8) to adjust the opening degree of the flue, fine adjustment of the pressure in the furnace is achieved, and finally the pressure in the furnace is stabilized between 1 pa and 20 pa.

6. The automatic furnace pressure adjusting method for the low-temperature pure oxygen combustion aluminum melting furnace according to claim 5, characterized in that: when the pressure in the aluminum melting furnace is stabilized at 1-20pa, the included angle between the gate plate (1) and the flue is 20-40 degrees.

Technical Field

The invention relates to the technical field of furnace pressure adjustment of low-temperature pure oxygen combustion aluminum melting furnaces, in particular to a furnace pressure automatic adjusting mechanism and an adjusting method for a low-temperature pure oxygen combustion aluminum melting furnace.

Background

The combustion modes of the conventional aluminum melting furnace generally comprise two modes of compressed air and natural gas (coal gas) and liquid oxygen and natural gas, burners utilizing the two combustion modes are respectively called as a heat accumulating type aluminum melting furnace and a low-temperature pure oxygen combustion aluminum melting furnace, wherein the low-temperature pure oxygen combustion aluminum melting furnace is a new burner developed for further improving the heat efficiency of the heat accumulating type aluminum melting furnace, reducing the discharge amount of nitrogen oxides and reducing metal melting loss, and the specific combustion melting furnace process is as follows: at normal temperature or a certain temperature, after the required molten metal material is filled in a smelting furnace, an ignition gun of a combustor of the aluminum melting furnace starts to ignite, the ignition is switched to a normal combustor to burn after ignition, when the temperature in the furnace reaches above 800 ℃, pure oxygen and natural gas enter a dispersion distribution state, the combustion in the furnace enters a flameless mode, the temperature in the smelting furnace reaches about 1000 ℃, a large amount of metal in the furnace starts to melt, when the temperature in the smelting furnace reaches the range of 720-740 ℃ after the metal is melted, the temperature in the furnace needs to be kept constant, at the moment, a burner nozzle is in a start-stop-start-stop operation mode, the pressure in the aluminum melting furnace needs to be kept constant in the whole smelting heat preservation process, the pressure in the aluminum melting furnace is generally controlled to be 1-20pa micro positive pressure, the fuel. The existing design for controlling the furnace pressure is to change the opening of a valve by controlling a cylinder through an electromagnetic valve so as to adjust the pressure in the furnace, and the design has the following defects: under the initial pneumatic and subsequent heat preservation section start-stop-start-stop operation modes of the burner, the amount of natural gas and oxygen entering the furnace in the moment can be suddenly increased, so that the pressure in the furnace is suddenly increased, the maximum amplitude can reach 400pa, at the moment, signals converted by the electromagnetic valve are fed back in a closed circuit and then the air cylinder is used for executing the adjusting valve, but the execution speed of the air cylinder is far slower than the instantaneous change speed of the pressure, the pressure adjusting system is easy to be disordered and cannot reach stability in a short time (the existing furnace pressure adjusting time is generally longer than 10 min), and finally the problems of unstable furnace pressure, failure of the pressure adjusting system and the like are caused.

Disclosure of Invention

In view of the above, the present invention provides an automatic furnace pressure adjusting mechanism and an adjusting method for a low-temperature pure oxygen combustion aluminum melting furnace, which can adjust the internal pressure of the furnace rapidly and efficiently, so as to stabilize the internal pressure of the aluminum melting furnace at 1-20 Pa.

The technical scheme adopted by the invention to solve the technical problems is as follows:

a furnace pressure automatic regulating mechanism for a low-temperature pure oxygen combustion aluminum melting furnace is used for regulating the furnace pressure by means of a flue which is arranged outside the aluminum melting furnace and is communicated with a hearth through a smoke outlet, and comprises a flashboard, a lever, a balance weight block, an air cylinder, a pressure sensor, an electromagnetic valve and a controller;

one end of the lever is sleeved on a support shaft outside the flue and can rotate around the support shaft, a groove is formed in the side wall of the flue, one end of the lever, sleeved on the support shaft, is fixedly connected with a gate plate which extends into the flue and is used for controlling the opening and closing of the flue, and a balancing weight block for balancing the gate plate is vertically hung at one end of the lever, away from the gate plate;

the pressure sensor is arranged at the top of the aluminum melting furnace and electrically connected with the controller, the controller is electrically connected with the electromagnetic valve, the electromagnetic valve is electrically connected with the cylinder, and the cylinder is connected with one end of the lever, which is far away from the flashboard;

under the initial condition, the flashboard is horizontally supported on the side wall of the groove to close the flue, and the flashboard and the balancing weight block are in a static balance state; when high-pressure gas with pressure greater than 50Pa is discharged into the flue through the smoke outlet, the flashboard and the balancing weight block are in a rotation balance state, the impact of the high-pressure gas can cause the flashboard to rotate around the supporting shaft to enable the flue to be opened by an opening degree quickly, the pressure in the furnace is reduced along with the discharge of the high-pressure gas, and the action of the cylinder can also cause the flashboard to rotate around the supporting shaft to finely adjust the opening degree of the flue to enable the pressure in the furnace to be stabilized at 1-20 Pa.

Further, the lever includes annular portion and the kink with annular portion fixed connection, the back shaft can be located to the annular portion cover, the one end that the annular portion was kept away from to the kink is located to the balancing weight piece.

Further, when the flashboard is the horizontality, the kink upwards extends along the direction slope of keeping away from the flue, be 100~180 contained angles between kink and the flashboard.

Further, the controller can control the air cylinder to react after the balancing weight block acts for 1-5 min.

A furnace pressure automatic regulating method of a low-temperature pure oxygen combustion aluminum melting furnace is characterized in that a furnace pressure automatic regulating mechanism discharges high-pressure gas in the aluminum melting furnace to the outside of the furnace to realize furnace pressure regulation, under the initial condition, a flashboard is horizontally supported on the side wall of a groove to close a flue, and the flashboard and a balancing weight block are in a static balance state; when the pressure in the aluminum melting furnace is more than 50pa, high-pressure gas is discharged into a flue from the furnace through a smoke outlet, the flashboard and the balancing weight block are in a rotating balance state, the flashboard impacted by the high-pressure gas rotates around the supporting shaft to enable the flue to be quickly opened by an opening degree so as to realize coarse adjustment of the pressure in the furnace, and the high-pressure gas is discharged into the furnace through the flue and is basically stable; and then the controller controls the cylinder to act through the electromagnetic valve according to the received signal of the pressure sensor so that the flashboard rotates around the support shaft to finely adjust the opening of the flue, so that the pressure in the furnace is finely adjusted, and finally the pressure in the furnace is stabilized between 1-20 pa.

Further, when the pressure in the aluminum melting furnace is stabilized at 1-20pa, the included angle between the flashboard and the flue is 20-40 degrees.

Has the advantages that:

as mentioned above, the automatic furnace pressure adjusting mechanism and the adjusting method for the low-temperature pure oxygen combustion aluminum melting furnace have the following beneficial effects:

1. the invention combines the lever principle to realize the automatic regulation of the furnace pressure of the aluminum melting furnace by adopting the combined action of two pressure regulation ways: firstly, under the impact of high-pressure gas exhausted from a furnace, the flashboard rotates around the support shaft to open the flue by an opening degree, and the pressure of the high-pressure gas exhausted from the flue to the furnace is basically stable, so that the rough adjustment of the pressure in the furnace is realized; and secondly, the pressure sensor transmits the detected pressure signal to the controller, the controller controls the cylinder to act through the electromagnetic valve to enable the flashboard to rotate around the supporting shaft so as to adjust the opening degree of the flue, so that the pressure in the furnace is finely adjusted, the pressure in the furnace is stabilized between 1-20pa finally, and the combination of two pressure adjusting modes can adjust the pressure in the furnace of the aluminum melting furnace quickly and efficiently.

2. The furnace pressure automatic regulating mechanism provided by the invention solves the technical requirements of rapid, efficient and automatic regulation of the furnace pressure of the low-temperature pure oxygen combustion aluminum melting furnace in the prior art, can ensure that the furnace pressure is kept within the range of the process requirement, can effectively improve the feedback time of pressure regulation and improve the stability of pressure regulation by utilizing the mechanism, and further provides technical support for the efficient operation of the aluminum melting furnace.

The present invention will be described in further detail with reference to the drawings and specific examples.

Drawings

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

FIG. 1 is a view showing a state where an automatic furnace pressure adjusting mechanism opens a flue by one degree of opening.

Fig. 2 is a state diagram of the present invention in which the flue is closed.

The device comprises a graphic mark 1, a flashboard 2, a pressure sensor 3, a controller 4, a counterweight plate 5, an electromagnetic valve 6, a cylinder 7, an adjusting rod 8 and a supporting shaft.

Detailed Description

The core of the invention is to provide a furnace pressure automatic regulating mechanism and a regulating method for a low-temperature pure oxygen combustion aluminum melting furnace, and the furnace pressure automatic regulating mechanism can be used for quickly and efficiently stabilizing the furnace pressure of the aluminum melting furnace at 1-20 Pa.

A furnace pressure automatic regulating mechanism for a low-temperature pure oxygen combustion aluminum melting furnace is used for regulating the furnace pressure by means of a flue which is arranged outside the aluminum melting furnace and is communicated with a hearth through a smoke outlet, please refer to figures 1 and 2, and comprises a flashboard 1, a lever 7, a balance weight block 4, a cylinder 6, a pressure sensor 2, an electromagnetic valve 5 and a controller 3; one end of the lever 7 is sleeved on a support shaft 8 outside the flue and can rotate around the support shaft 8, a groove is formed in the side wall of the flue, one end of the lever 7, sleeved on the support shaft 8, is fixedly connected with a flashboard 1 used for controlling the opening and closing of the flue, and a balancing weight block 4 used for balancing the flashboard 1 is vertically hung at one end, away from the flashboard 1, of the lever 7; the pressure sensor 2 is arranged at the top of the aluminum melting furnace, the pressure sensor 2 is electrically connected with the controller 3, the controller 3 is electrically connected with the electromagnetic valve 5, the electromagnetic valve 5 is electrically connected with the air cylinder 6, and the air cylinder 6 is connected with one end of the lever 7, which is far away from the flashboard 1; under the initial condition, the flashboard 1 is horizontally supported on the side wall of the groove to close the flue, and the flashboard 1 and the balancing weight block 4 are in a static balance state; when high-pressure gas with pressure greater than 50Pa is discharged into the flue through the smoke outlet, the flashboard 1 and the balancing weight block 4 are in a rotation balance state, the impact of the high-pressure gas can cause the flashboard 1 to rotate around the support shaft 8 to enable the flue to be opened by an opening degree quickly, the pressure in the furnace is reduced along with the discharge of the high-pressure gas, and the action of the cylinder 6 can also cause the flashboard 1 to rotate around the support shaft 8 to enable the pressure in the furnace to be stabilized at 1-20Pa by finely adjusting the opening degree of the flue.

In detail, the lever 7 includes an annular portion and a bending portion fixedly connected to the annular portion, the annular portion can be sleeved on the supporting shaft 8, and the balancing weight 4 is disposed at one end of the bending portion away from the annular portion.

It should be noted that, when flashboard 1 is the horizontality, the kink extends upwards along the direction slope of keeping away from the flue, be 100~180 contained angles between kink and the flashboard 1, and this design can guarantee that the motion of balancing weight 4 can not be interfered.

A low-temperature pure oxygen combustion melts the automatic regulating method of the furnace pressure of the aluminium stove, discharge the high-pressure gas in the aluminium stove of melting to the outside of the stove and realize the furnace pressure is adjusted through the automatic regulating mechanism of the furnace pressure, under the initial condition, the flashboard 1 supports on the sidewall of recess horizontally and makes the flue closed, the flashboard 1 and balancing weight 4 are in the static equilibrium state; when the pressure in the aluminum melting furnace is more than 50pa, high-pressure gas is discharged into a flue from a smoke outlet in the furnace, the flashboard 1 and the balancing weight block 4 are in a rotating balance state, the flashboard 1 impacted by the high-pressure gas rotates around the supporting shaft 8 to enable the flue to be opened by an opening degree rapidly so as to realize coarse adjustment of the pressure in the furnace, the high-pressure gas is discharged into the furnace through the flue, the balancing weight block 4 extends to the bottom of the aluminum melting furnace when the pressure in the furnace is basically stable, and the lower part of the furnace is suitable for manual operation; and then the controller 3 controls the cylinder 6 to act through the electromagnetic valve 5 according to the received signal of the pressure sensor 2, so that the flashboard 1 rotates around the supporting shaft 8 to adjust the opening degree of the flue, the fine adjustment of the pressure in the furnace is realized, and finally the pressure in the furnace is stabilized between 1-20 pa.

It should be noted that the controller 4 can control the cylinder 6 to perform a reaction after the balancing weight block 4 acts for 1-5min, that is, when the pressure of the high-pressure gas in the aluminum melting furnace is greater than 50pa, the controller 3 only performs pressure monitoring within 1-5min, but does not control the cylinder to act, when the pressure in the furnace is basically stable, the controller 3 controls the cylinder 6 to act through the electromagnetic valve 5, the flashboard 1 is accurately pushed to rotate at a low speed, and the opening of the flue is finely adjusted.

In detail, when the pressure in the aluminum melting furnace is stabilized at 1-20pa, the included angle between the gate plate 1 and the flue is 20-40 degrees.

In detail, the solenoid valve 5 is generally selected to be capable of performing adjustment of the solenoid valve 5.

Taking a 10T circular low-temperature pure oxygen combustion aluminum melting furnace as an example, two sets of burner systems are generally symmetrically arranged in the furnace, a pressure sensor 2 for monitoring the pressure in the furnace is arranged at the top of the furnace, a furnace door and a feeding system are arranged on the front side perpendicular to two sets of burner connecting lines, a smoke exhaust system is arranged on the upper portion of one set of burner, the smoke exhaust system is led out from a smoke exhaust port to the outside of the furnace and enters an outdoor dust collecting system, a gate plate 1 is arranged in a flue, the gate plate 1 rotates around a support shaft 8 to open the flue by opening the flue when high-pressure gas impacts the gate plate 1 according to a lever balance principle because the two sets of burners frequently start and stop the limited space in the hearth at the initial stage and the temperature control stage, and the pressure in the hearth is basically stable after 1-2 min; pressure sensor 2 sends the pressure signal who detects to controller 3, and controller 3 controls 6 actions of cylinder through solenoid valve 5 and drives flashboard 1 and rotate around support shaft 8 in order to finely tune the aperture of flue, and for the reaction time of guaranteeing control accuracy and each spare part this moment, cylinder 6 need be at low operating pressure slow motion down, finally makes the pressure in the stove stabilize between 1~20pa, and 6 operating pressure of cylinder is not more than 0.05MPa this moment.

The automatic furnace pressure adjusting mechanism and the adjusting method for the low-temperature pure oxygen combustion aluminum melting furnace provided by the invention are described in detail, and the principle and the specific implementation mode of the invention are explained by applying specific examples, and the examples are only used for helping to understand the method and the core idea of the invention. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protective scope of the present invention to those skilled in the art.