A centralized hot blast stove blast furnace gas pressure stabilizing system during stove switching period and its operation method

Abstract

A centralized hot blast stove blast furnace gas pressure stabilizing system during stove switching period according to the present invention includes a blast furnace gas pressure stabilizing device and an automatic control system; the blast furnace gas pressure stabilizing device includes: a blast furnace gas storage air bag for storing gas; a gas pressure control mechanism arranged above the blast furnace gas storage air bag for pressure adjustment; the automatic control system includes: n state acquisition modules for acquiring the states of n hot blast stoves; a gas volume acquisition module for acquiring the gas volume of the blast furnace gas storage air bag; a control device for receiving the states of the n hot blast stoves transmitted by the n state acquisition modules and the gas volume of the blast furnace gas storage air bag transmitted by the gas volume acquisition module, and the control device performs opening and closing actions on the corresponding hot blast stove gas inlet valves according to the states of the n hot blast stoves, so as to realize the control of the blast furnace gas volume by the gas pressure control mechanism; this system avoids the problem of blast furnace gas pressure fluctuation caused by simultaneous stove switching of multiple hot blast stoves.

Description

Technical Field

[0001] The present invention belongs to the technical field of blast furnace gas pressure stabilization in the iron and steel industry, and particularly relates to a centralized hot blast stove gas pressure stabilization system and operation method during the stove changing period of a blast furnace. Background Art

[0002] As an important auxiliary production equipment of a blast furnace, a hot blast stove is the main user of blast furnace gas. Approximately 30% of the blast furnace gas generated by blast furnace ironmaking is used for the hot blast stove. Generally, 3 - 4 hot blast stoves are equipped for a blast furnace ironmaking, and a blowing system of two burning and one blowing or two burning and two blowing is adopted. The combustion rhythms of the hot blast stoves of each blast furnace lack the same coordination, and the situation of multiple hot blast stoves changing stoves simultaneously often occurs, resulting in large fluctuations in the total blast furnace gas consumption of the hot blast stoves, and thus leading to fluctuations in the blast furnace gas pressure.

[0003] Patent Invention CN111414024B, a method for coordinating stove changing of a blast furnace hot blast stove gas pipeline network, discloses a method for coordinating the stove changing timing between hot blast stoves of each blast furnace based on the burning state and future state prediction of the blast furnace hot blast stove. It includes establishing an optical fiber physical link between the server and the blast furnace hot blast stove, collecting parameter data such as the operating parameters of each hot blast stove, realizing stove changing of the hot blast stove at staggered peaks, minimizing the phenomenon of multiple hot blast stoves changing stoves simultaneously to the greatest extent, thereby reducing the impact of multiple hot blast stoves changing stoves simultaneously on the blast furnace gas pipeline network pressure, and thus achieving the purpose of stabilizing the blast furnace gas pressure. The technical solution of this invention has played a positive role in stabilizing the blast furnace gas pressure, but even the stove changing of a single hot blast stove still has an impact on the blast furnace gas pressure, and it cannot fundamentally solve the influence of hot blast stove stove changing on the blast furnace gas pressure.

[0004] The article "A Method for Coordinating Stove Changing of Blast Furnace Hot Blast Stoves" details a method for coordinating stove changing between hot blast stoves of blast furnaces. By calculating the technological state of the hot blast stove, formulating a reasonable stove changing system at staggered peaks and evaluation indicators, effectively predicting the operating state of the hot blast stove, and automatically optimizing the combustion control of the hot blast stove through the designed control strategy and safety strategy. This method effectively realizes stove changing of the hot blast stove at staggered peaks, ensures the heat storage and blowing air temperature of the hot blast stove, reduces the pressure fluctuation of the gas pipeline network, and reduces the working intensity of operators. The method of this paper has achieved good results in stabilizing the blast furnace gas pressure, and similarly cannot fundamentally solve the influence of hot blast stove stove changing on the blast furnace gas pressure.

[0005] Patent Invention CN201811241499.X, a method and device for precisely controlling the temperature of the burning flue of a blast furnace hot blast stove, discloses a method for precisely controlling the temperature of the hot blast stove flue by collecting the operating parameter data of the hot blast stove control system and judging the state of the hot blast stove. This method considers the influence of hot blast stove stove changing on the blast furnace gas pressure fluctuation, increases the process control accuracy of the hot blast stove, but does not provide a solution to the gas pressure fluctuation caused by hot blast stove stove changing.

[0006] In summary, it can be seen that during the stove changing process of the hot blast stove, especially when centralized stove changing is carried out for hot blast stoves with multiple blast furnaces, due to the centralized stop or use of blast furnace gas by the hot blast stoves, the pressure of blast furnace gas fluctuates greatly, resulting in unstable operating conditions of blast furnace gas users. This has become a common problem in the iron and steel industry, and it is necessary to develop a technical means to stabilize the pressure of blast furnace gas starting from the technological characteristics of the hot blast stove. Summary of the Invention

[0007] To solve the above problems, the technical solution adopted by the present invention is: A blast furnace gas pressure stabilizing system during the stove changing period of a centralized hot blast stove, including

[0008] A blast furnace gas pressure stabilizing device and an automatic control system;

[0009] The blast furnace gas pressure stabilizing device includes:

[0010] A blast furnace gas storage airbag for storing gas;

[0011] A gas pressure control mechanism arranged above the blast furnace gas storage airbag for pressure adjustment;

[0012] The automatic control system includes:

[0013] N state acquisition modules for acquiring the states of n hot blast stoves;

[0014] A gas volume acquisition module for acquiring the gas volume of the blast furnace gas storage airbag;

[0015] A control device for receiving the states of the n hot blast stoves transmitted by the n state acquisition modules and the gas volume of the blast furnace gas storage airbag transmitted by the gas volume acquisition module. The control device performs opening and closing actions on the corresponding hot blast stove gas inlet valves according to the states of the n hot blast stoves, and realizes the control of the blast furnace gas volume by the gas pressure control mechanism.

[0016] Furthermore: The gas pressure control mechanism includes M pressure control weights arranged above the blast furnace gas storage airbag for making the blast furnace gas in the blast furnace gas storage airbag have a certain pressure and a suspension mechanism for suspending the pressure control weights;

[0017] The gas inlet is arranged at a position from 1 / 8 to 1 / 6 above the bottom of the blast furnace gas storage airbag;

[0018] The gas outlet is arranged at a position from 1 / 6 to 1 / 3 above the bottom of the blast furnace gas storage airbag.

[0019] Furthermore: The blast furnace gas pressure stabilizing device includes a housing, and the shape of the housing is cylindrical or can be other shapes;

[0020] The height of the outer shell is the sum of the height of the blast furnace gas storage airbag when it is filled with blast furnace gas and the height of the pressure control mechanism.

[0021] Furthermore, a blast furnace gas volume detection instrument is installed on the outer shell, and the gas volume detection result is transmitted to the control device in real time. A pressure control mechanism is installed on the top of the outer shell of the voltage stabilizing device.

[0022] Furthermore, the blast furnace gas storage airbag is placed inside the outer shell of the voltage stabilizing device, and the material of the airbag is rubber. The blast furnace gas storage airbag is generally cylindrical. The bottom to 1 / 3 of the overall height of the blast furnace gas storage airbag is a smooth structure, and the bottom 1 / 3 of the overall height of the blast furnace gas storage airbag to the top is a corrugated structure.

[0023] Furthermore, the gas inlet and the gas outlet are arranged in a staggered manner in the height direction.

[0024] Furthermore, the maximum capacity of the blast furnace gas airbag is 2 / 3 of the total hourly gas consumption of its n blast furnace hot stoves. The blast furnace gas storage in the blast furnace gas airbag is controlled within 1 / 2 to 3 / 4 of the total capacity, and the blast furnace gas storage in the blast furnace gas airbag is controlled by the control device.

[0025] Furthermore, the pressure range of the blast furnace gas storage airbag is between 12Kpa and 18Kpa.

[0026] Furthermore, the number of M is 2 to 5, and the optimal number of M is 4.

[0027] An operation method of a centralized hot blast stove blast furnace gas voltage stabilizing system includes the following steps:

[0028] S1: The control device establishes communication with n state acquisition modules and gas volume acquisition modules.

[0029] S2: Obtain the blast furnace gas volume information of the blast furnace gas storage airbag, including the actual gas volume and the remaining oxygen gas storage volume in the blast furnace gas storage airbag, and obtain the operating states of n hot blast stoves. The operating states of the hot blast stoves include: start of firing, end of firing, start of air supply, end of air supply, start of stove change, and end of stove change.

[0030] S3: When a certain hot blast stove finishes firing, this hot blast stove is called the fired-out hot blast stove, and it is the 1# hot blast stove. The control device controls the closing of the gas inlet valve of the fired-out hot blast stove, and the blast furnace gas for the fired-out hot blast stove enters the blast furnace gas airbag of the blast furnace gas voltage stabilizing device, avoiding the blast furnace gas pressure fluctuation caused by the stop of firing of the hot blast stove.

[0031] S4: When the air supply of a hot blast stove ends and the stove switching operation is completed, the hot blast stove that starts burning is designated as the hot blast stove starting the burning process, which is the 2# hot blast stove in this case. Open the blast furnace gas inlet valve of the hot blast stove starting the burning process to start the burning. Since the blast furnace gas pressure stabilizing device stores blast furnace gas, the control device controls the weights to keep the blast furnace gas in the blast furnace gas pressure stabilizing device at a stable working pressure all the time, which plays a buffering role in the sudden gas supply process of the blast furnace gas for the hot blast stove starting the burning process, avoiding the impact on the blast furnace gas pipeline network pressure during the start of the hot blast stove burning process;

[0032] By circulating S3 - S4, the stable switching of the blast furnace gas pressure of n hot blast stoves without fluctuations can be achieved. The gas volume in the blast furnace gas airbag is adjusted through the blast furnace gas intake volume of the blast furnace gas pressure stabilizing system: when the blast furnace gas volume in the blast furnace gas airbag exceeds 3 / 4, the intake volume is reduced; when the blast furnace gas volume in the blast furnace gas airbag is lower than 1 / 2, the intake volume is increased.

[0033] This method is applicable to external combustion hot blast stoves, top combustion hot blast stoves, and internal combustion hot blast stoves, and is suitable for blast furnaces equipped with 3 or 4 hot blast stoves.

[0034] A centralized hot blast stove stove switching period blast furnace gas pressure stabilizing system and operation method provided by the present invention. The technical solution of the present invention realizes the centralized control of the hot blast stove pressure of a single blast furnace by adding a set of blast furnace gas buffering systems in front of the hot blast stoves of each blast furnace. When the burning of the hot blast stove ends, the blast furnace gas source can supply gas to the pressure stabilizing system according to the blast furnace gas consumption of the burning hot blast stove; at the moment when the hot blast stove starts burning, the blast furnace gas buffering system of the hot blast stove supplies blast furnace gas to the hot blast stove, avoiding a sudden increase in the gas consumption of the blast furnace gas system. The application of the technical solution of the present invention changes the instantaneous cut-off or cliff-like rigid change process of the blast furnace gas caused by the stove switching of the hot blast stove into a flexible gradual change process, fundamentally solving the technical problem of large fluctuations in the blast furnace gas pressure caused by the stove switching of the hot blast stove, especially when multiple hot blast stoves switch stoves simultaneously in iron and steel enterprises. The blast furnace gas pressure stabilizing system is suitable for iron and steel enterprises equipped with single or multiple blast furnaces, especially iron and steel enterprises with multiple blast furnaces. It effectively avoids the problem of fluctuations in the blast furnace gas pressure caused by the stove switching of multiple hot blast stoves, especially when multiple hot blast stoves switch stoves simultaneously. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is the structure diagram of Embodiment 1.

[0037] Reference numerals: 1 is a blast furnace gas pipeline, 2 is a gas inlet, 3 is a blast furnace gas pressure stabilizing device, 4 is a pressure control mechanism, 5 is a gas outlet, 6 is a hot blast stove gas inlet valve, and 7 is a hot blast stove combustion chamber. Detailed implementation manners

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. The description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0043] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0044] In addition, it should be noted that using words such as "first", "second" etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0045] A blast furnace gas pressure stabilizing system during the stove changing period of a centralized hot blast stove, comprising:

[0046] A blast furnace gas pressure stabilizing device 3 and an automatic control system;

[0047] The blast furnace gas pressure stabilizing device 3 includes:

[0048] A blast furnace gas storage airbag for storing gas;

[0049] A gas pressure control mechanism 4 disposed above the blast furnace gas storage airbag for pressure adjustment;

[0050] The automatic control system includes:

[0051] n state acquisition modules for acquiring the states of n hot blast stoves;

[0052] A gas volume acquisition module for acquiring the gas volume of the blast furnace gas storage airbag;

[0053] A control device that receives the states of the n hot blast stoves transmitted by the n state acquisition modules and the gas volume in the blast furnace gas pressure stabilizing device transmitted by the gas volume acquisition module. The control device performs opening and closing actions on the corresponding hot blast stove gas inlet valves according to the states of the n hot blast stoves, so as to realize the control of the blast furnace gas volume by the gas pressure control mechanism 4.

[0054] Each of the hot blast stoves is provided with a hot blast stove combustion chamber 7 for gas combustion;

[0055] A hot blast stove gas inlet valve 6 is provided on the hot blast stove;

[0056] A hot blast stove gas outlet valve is provided at the gas outlet;

[0057] The blast furnace gas pressure stabilizing system includes a blast furnace gas storage airbag for storing gas and a gas pressure control mechanism 4 provided above the blast furnace gas storage airbag;

[0058] The gas pressure control mechanism 4 includes M pressure control weights provided above the blast furnace gas storage airbag for making the blast furnace gas in the blast furnace gas storage airbag have a certain pressure and a suspension mechanism for suspending the pressure control weights;

[0059] A gas inlet 2 is arranged at a position 1 / 8 to 1 / 6 above the bottom of the blast furnace gas storage airbag,

[0060] A gas outlet 5 is arranged at a position 1 / 6 to 1 / 3 above the bottom of the blast furnace gas storage airbag,

[0061] The gas pressure adjustment mechanism 4 further includes a housing. The shape of the housing is cylindrical or can be other shapes. The thickness of the housing is 8 mm to 12 mm, and the material is Q235 steel or can be other steel materials;

[0062] The height of the housing is the sum of the height when the blast furnace gas storage airbag is filled with blast furnace gas and the height of the gas pressure control mechanism 4. A blast furnace gas storage airbag gas volume detection instrument is installed on the housing of the pressure stabilizing device, and the gas volume detection result is transmitted to the control system of the hot blast stove blast furnace gas pressure stabilizing system in real time. The gas pressure control mechanism 4 is installed on the top of the housing of the blast furnace gas pressure stabilizing device 3;

[0063] The blast furnace gas storage airbag is placed in the housing, and its material is wear-resistant and corrosion-resistant rubber or can be other flexible materials;

[0064] The blast furnace gas storage airbag is cylindrical as a whole. The bottom to 1 / 3 of the height of the whole blast furnace gas storage airbag is a smooth structure, and the 1 / 3 of the height of the whole blast furnace gas storage airbag from the bottom to the top is a corrugated structure, which can freely expand and contract when the amount of blast furnace gas in the blast furnace gas storage airbag changes; The blast furnace gas pipeline 1 is hermetically connected to the blast furnace gas storage airbag to ensure that blast furnace gas can stably enter and exit the blast furnace gas storage airbag. The gas inlet 2 of the pressure stabilizing device and the gas outlet 5 of the pressure stabilizing device are arranged in a staggered manner in the height direction; The gas inlet 2 is arranged at a place 1 / 8 to 1 / 6 above the bottom of the blast furnace gas storage airbag; The gas outlet 5 is arranged at a place 1 / 6 to 1 / 3 above the bottom of the blast furnace gas storage airbag; The maximum capacity of the blast furnace gas airbag is 2 / 3 of the total hourly gas consumption of its n blast furnace hot stoves, and the blast furnace gas storage in the blast furnace gas airbag is controlled at 1 / 2 of the total capacity;

[0065] The maximum capacity of the blast furnace gas airbag is 2 / 3 of the total hourly gas consumption of its n blast furnace hot stoves. The blast furnace gas storage in the blast furnace gas airbag is controlled within the range of 1 / 2 to 3 / 4 of the total capacity. The blast furnace gas storage in the blast furnace gas airbag can be controlled by the automatic control system of the blast furnace gas pressure stabilizing system;

[0066] The pressure control weight is disc-shaped and made of ordinary steel; The pressure control weight is placed on the blast furnace gas storage airbag to make the blast furnace gas in the blast furnace gas storage airbag have a certain pressure, which is 15KPa. The pressure magnitude is controlled by the number of pressure control weights placed on the blast furnace gas storage airbag. The pressure control weights placed on the blast furnace gas storage airbag are called working pressure control weights, and the rest of the pressure control weights are called spare pressure control weights. The spare pressure control weights are suspended on the top of the pressure stabilizing device shell through a suspension mechanism; The number of pressure control weights is 2 to 5, and the best number is 4. The number of working pressure control weights is 2 to 3, and the number of spare pressure control weights is 1 to 2; The pressure control range of the blast furnace gas in the blast furnace gas storage airbag is the designed gas working condition pressure of the hot stove.

[0067] The pressure range of the blast furnace gas storage airbag is between 12Kpa and 18Kpa;

[0068] The process of the control device controlling the gas pressure control mechanism 4 to supply gas to the hot stove according to the states of n hot stoves is as follows:

[0069] Obtaining the blast furnace gas volume information of the blast furnace gas storage airbag includes the actual gas volume and the remaining oxygen gas storage volume in the blast furnace gas storage airbag,

[0070] Obtaining the operating state judgment of a single hot stove includes: start of firing, end of firing, start of air supply, end of air supply, start of stove switching, and end of stove switching;

[0071] The automatic control system of the blast furnace gas pressure stabilization system during the stove switching period of the hot blast stove functions to realize the automatic operation of the blast furnace gas pressure stabilization system during the stove switching period of the hot blast stove based on the blast furnace gas volume information of the blast furnace gas storage airbag and the operating status of a single hot blast stove, and to realize the automatic opening or closing of the blast furnace gas valve of the hot blast stove. When the gas volume in the blast furnace gas storage airbag is not within the designed range, an alarm prompt is given, and the automatic control mode is exited.

[0072] As described in a method for operating a centralized blast furnace gas pressure stabilization system during the hot blast stove period, it includes the following steps:

[0073] S1: The control device establishes communication with n state acquisition modules and gas volume acquisition modules;

[0074] S2: Obtain the blast furnace gas volume information of the blast furnace gas storage airbag, including the actual gas volume and the remaining oxygen gas storage volume in the blast furnace gas storage airbag, and obtain the operating status of n hot blast stoves. The operating status of the hot blast stove includes: start of firing, end of firing, start of air supply, end of air supply, start of stove switching, and end of stove switching;

[0075] S3: When a certain hot blast stove finishes firing, call this hot blast stove the fired - off hot blast stove, and it is the 1# hot blast stove. The control device controls to close the gas inlet valve of the fired - off hot blast stove, and the blast furnace gas for the fired - off hot blast stove enters the blast furnace gas airbag of the blast furnace gas pressure stabilization device, avoiding the blast furnace gas pressure fluctuation caused by the stop of firing of the hot blast stove;

[0076] S4: When a certain hot blast stove finishes air supply and completes the stove - switching operation, call this hot blast stove the firing - start hot blast stove, and it is the 2# hot blast stove. Open the blast furnace gas inlet valve of the firing - start hot blast stove to start firing. Since the blast furnace gas pressure stabilization device stores blast furnace gas, the control device controls the weights to keep the blast furnace gas in the blast furnace gas pressure stabilization device at a stable working pressure of 15 KPa all the time, which plays a buffering role in the sudden gas supply process of the blast furnace gas for the firing - start hot blast stove and avoids the impact on the blast furnace gas pipeline network pressure during the start of firing of the hot blast stove;

[0077] Loop S3 - S4, and the smooth stove switching of n hot blast stoves without blast furnace gas pressure fluctuation can be realized. The gas volume in the blast furnace gas airbag is adjusted by the blast furnace gas intake volume of the blast furnace gas pressure stabilization system: when the blast furnace gas volume in the blast furnace gas airbag exceeds 3 / 4, the intake volume is reduced; when the blast furnace gas volume in the blast furnace gas airbag is lower than 1 / 2, the intake volume is increased.

[0078] This method is applicable to externally - fired hot blast stoves, top - fired hot blast stoves, and internally - fired hot blast stoves, and is suitable for blast furnaces equipped with 3 or 4 hot blast stoves. This method is applicable to externally - fired hot blast stoves, top - fired hot blast stoves, and internally - fired hot blast stoves, and is suitable for blast furnaces equipped with 3 or 4 hot blast stoves.

[0079] Example 1. A blast furnace gas pressure stabilizing system during the stove changing period of a centralized hot blast stove, comprising a blast furnace gas pressure stabilizing device 3 and an automatic control system;

[0080] The blast furnace gas pressure stabilizing device includes:

[0081] A blast furnace gas storage airbag for storing gas;

[0082] A gas pressure control mechanism 4 placed above the blast furnace gas storage airbag for pressure adjustment;

[0083] The automatic control system includes:

[0084] Four state acquisition modules for acquiring the states of 4 hot blast stoves;

[0085] A gas volume acquisition module for acquiring the gas volume of the blast furnace gas storage airbag;

[0086] A control device that receives the states of the 4 hot blast stoves transmitted by the 4 state acquisition modules and the gas volume of the blast furnace gas storage airbag transmitted by the gas volume acquisition module. The control device performs opening and closing actions on the corresponding hot blast stove gas inlet valves according to the states of the 4 hot blast stoves, and realizes the control of the blast furnace gas volume by the gas pressure control mechanism.

[0087] The gas pressure control mechanism 4 includes 4 pressure control weights for making the blast furnace gas in the blast furnace gas storage airbag have a certain pressure and a suspension mechanism for suspending the pressure control weights, which are arranged above the blast furnace gas storage airbag;

[0088] A gas inlet is arranged at the 1 / 8 position above the bottom of the blast furnace gas storage airbag;

[0089] A gas outlet is arranged at the 1 / 3 position above the bottom of the blast furnace gas storage airbag.

[0090] The blast furnace gas storage airbag is placed inside the pressure stabilizing device housing, and the material of the airbag is rubber; the blast furnace gas storage airbag is integrally cylindrical. The height from the bottom to 1 / 3 of the overall height of the blast furnace gas storage airbag is a smooth structure, and the height from 1 / 3 of the overall height of the blast furnace gas storage airbag at the bottom to the top is a corrugated structure.

[0091] The maximum capacity of the blast furnace gas airbag is 2 / 3 of the total hourly gas consumption of its 4 blast furnace hot blast stoves. The gas storage in the blast furnace gas airbag is controlled within 1 / 2 to 3 / 4 of the total capacity, and the gas storage in the blast furnace gas airbag is controlled by the control device.

[0092] The pressure range of the blast furnace gas storage airbag is between 12Kpa and 15Kpa.

[0093] As described in the operation method of a centralized hot blast stove stage blast furnace gas pressure stabilizing system, the control device controls the gas pressure control actuator, and the process of opening and closing the corresponding hot blast stove gas inlet valve and controlling the blast furnace gas volume in the gas pressure adjustment mechanism according to the states of 4 hot blast stoves is as follows:

[0094] S1: The control device establishes communication with 4 state acquisition modules and a gas volume acquisition module;

[0095] S2: Obtain the blast furnace gas volume information of the blast furnace gas storage airbag, including the actual gas volume and the remaining oxygen gas storage volume in the blast furnace gas storage airbag, and obtain the operating states of 4 hot blast stoves. The operating states of the hot blast stoves include: start of firing, end of firing, start of blowing, end of blowing, start of stove change, and end of stove change;

[0096] S3: When a certain hot blast stove ends firing, call this hot blast stove the fired - ended hot blast stove, and it is the 1# hot blast stove. The control device controls to close the gas inlet valve of the fired - ended hot blast stove, allowing the blast furnace gas for the fired - ended hot blast stove to enter the blast furnace gas airbag of the blast furnace gas pressure stabilizing device, avoiding the blast furnace gas pressure fluctuation caused by the stop of hot blast stove firing;

[0097] S4: When a certain hot blast stove ends blowing and completes the stove - changing operation, call this hot blast stove the firing - start hot blast stove, and it is the 2# hot blast stove. Open the gas inlet valve of the firing - start hot blast stove to start firing. Since the blast furnace gas pressure stabilizing device stores blast furnace gas, the control device controls the weights to keep the blast furnace gas in the blast furnace gas pressure stabilizing device at a stable working pressure of 15 KPa all the time, which plays a buffering role in the sudden gas supply process of the firing - start hot blast stove and avoids the impact on the blast furnace gas pipeline network pressure during the start of hot blast stove firing;

[0098] By circulating S3 - S4, it is possible to achieve a smooth stove change without blast furnace gas pressure fluctuation for 4 hot blast stoves. The gas volume in the blast furnace gas airbag is adjusted through the blast furnace gas intake volume of the blast furnace gas pressure stabilizing system: when the blast furnace gas volume in the blast furnace gas airbag exceeds 3 / 4, reduce the intake volume; when the blast furnace gas volume in the blast furnace gas airbag is lower than 1 / 2, increase the intake volume.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centralized hot blast stove blast furnace gas pressure stabilizing system during stove switching period, characterized in that: including a blast furnace gas pressure stabilizing device and an automatic control system; The blast furnace gas pressure stabilizing device includes: a blast furnace gas storage air bag for storing gas; a gas pressure control mechanism disposed above the blast furnace gas storage air bag for pressure adjustment; The automatic control system includes: n state acquisition modules for acquiring the states of n hot blast stoves; a gas volume acquisition module for acquiring the gas volume of the blast furnace gas storage air bag; a control device that receives the states of the n hot blast stoves transmitted by the n state acquisition modules and the gas volume of the blast furnace gas storage air bag transmitted by the gas volume acquisition module, and the control device performs opening and closing actions on the corresponding hot blast stove gas inlet valves according to the states of the n hot blast stoves to realize the control of the blast furnace gas volume by the gas pressure control mechanism; The gas pressure control mechanism includes M pressure control weights disposed above the blast furnace gas storage air bag for making the blast furnace gas in the blast furnace gas storage air bag have a certain pressure and a suspension mechanism for suspending the pressure control weights; A gas inlet is arranged at a position of 1 / 8 to 1 / 6 above the bottom of the blast furnace gas storage air bag; A gas outlet is arranged at a position of 1 / 6 to 1 / 3 above the bottom of the blast furnace gas storage air bag; As for the operation method of a centralized hot blast stove switching period blast furnace gas pressure stabilizing system as described above, it includes the following steps: S1: The control device establishes communication with the n state acquisition modules and the gas volume acquisition module; S2: Obtain the blast furnace gas volume information of the blast furnace gas storage air bag, including the actual gas volume and the remaining gas storage volume in the blast furnace gas storage air bag, and obtain the operating states of the n hot blast stoves. The operating states of the hot blast stoves include: start of firing, end of firing, start of air supply, end of air supply, start of stove switching, and end of stove switching; S3: When a certain hot blast stove finishes firing, call this hot blast stove the fired-out hot blast stove, and it is the 1# hot blast stove. The control device controls the closing of the gas inlet valve of the fired-out hot blast stove, and the blast furnace gas for the fired-out hot blast stove enters the blast furnace gas air bag of the blast furnace gas pressure stabilizing device, avoiding the blast furnace gas pressure fluctuation caused by the stop of firing of the hot blast stove; S4: When a certain hot blast stove finishes air supply and completes the stove switching operation, call this hot blast stove the firing-starting hot blast stove, and it is the 2# hot blast stove. Open the gas inlet valve of the firing-starting hot blast stove to start firing. Since the blast furnace gas pressure stabilizing device stores blast furnace gas, the control device controls the weights to keep the blast furnace gas in the blast furnace gas pressure stabilizing device at a stable working pressure all the time, playing a buffering role in the sudden gas supply process of the firing-starting hot blast stove and avoiding the impact on the blast furnace gas pipeline network pressure during the start of firing of the hot blast stove; Loop S3 to S4, and the blast furnace gas pressure of the n hot blast stoves can be smoothly switched without fluctuation. The gas volume in the blast furnace gas air bag is adjusted by the blast furnace gas intake volume of the blast furnace gas pressure stabilizing system: when the blast furnace gas volume in the blast furnace gas air bag exceeds 3 / 4, reduce the intake volume; when the blast furnace gas volume in the blast furnace gas air bag is lower than 1 / 2, increase the intake volume.

2. A blast furnace gas pressure stabilizing system during the stove switching period of a centralized hot blast stove according to claim 1, characterized in that: The blast furnace gas pressure stabilizing device includes a housing, and the shape of the housing is cylindrical; The height of the outer shell is the sum of the height of the blast furnace gas storage airbag when it is filled with blast furnace gas and the height of the pressure control mechanism.

3. A blast furnace gas pressure stabilizing system during the stove switching period of a centralized hot blast stove according to claim 1, characterized in that: A blast furnace gas volume detection instrument is installed on the outer shell of the voltage stabilizing device, and the gas volume detection result is transmitted to the control device in real time. A gas pressure control mechanism is installed on the top of the outer shell of the blast furnace gas voltage stabilizing device.

4. A blast furnace gas pressure stabilizing system during the stove changing period of a centralized hot blast stove according to claim 1, characterized in that: The blast furnace gas storage airbag is placed inside the outer shell of the voltage stabilizing device, and the material of the airbag is rubber; the blast furnace gas storage airbag is generally cylindrical. The bottom of the blast furnace gas storage airbag to 1 / 3 of the overall height of the blast furnace gas storage airbag is a smooth structure, and from the bottom 1 / 3 of the overall height of the blast furnace gas storage airbag to the top is a corrugated structure.

5. A blast furnace gas pressure stabilizing system during the stove switching period of a centralized hot blast stove according to claim 1, characterized in that: The gas inlet and the gas outlet are arranged in a staggered manner in the height direction.

6. A blast furnace gas pressure stabilizing system during the stove switching period of a centralized hot blast stove according to claim 1, characterized in that: The maximum capacity of the blast furnace gas airbag is 2 / 3 of the total hourly gas consumption of its n blast furnace hot stoves. The blast furnace gas storage in the blast furnace gas airbag is controlled within 1 / 2 to 3 / 4 of the total capacity, and the blast furnace gas storage in the blast furnace gas airbag is controlled by the control device.

7. A blast furnace gas pressure stabilizing system during the stove changing period of a centralized hot blast stove according to claim 1, characterized in that: The pressure range of the blast furnace gas storage airbag is between 12Kpa and 18Kpa.

8. A blast furnace gas pressure stabilizing system during the stove switching period of a centralized hot blast stove according to claim 1, characterized in that: The number of M is 2 to 5.

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