Precision nitrogen pressure gauge with overpressure alarm function

Abstract

The present invention provides a precision nitrogen pressure gauge with an overpressure alarm function, which performs a pre-cooling process according to the internal temperature information of the blast furnace to avoid the combustible gas inside the blast furnace from reigniting and affecting the safety of subsequent purging. At the same time, the internal pressure of the blast furnace can be further reduced by reducing the internal temperature of the blast furnace, thereby reducing the difficulty of subsequent nitrogen filling. According to the real-time air pressure inside the blast furnace, the operating parameters of the nitrogen filling are adjusted to avoid the inability to continue to fill nitrogen as the internal air pressure of the blast furnace increases, thereby reducing the dilution efficiency of the combustible gas inside the blast furnace, and then the interior of the blast furnace is vacuumed to ensure that the combustible gas is extracted from the interior of the blast furnace to the maximum extent. When it is necessary to continue to fill nitrogen, nitrogen filling and exhaust operations are performed on the interior of the blast furnace at the same time, forming a dynamic purge gas path inside the blast furnace, so that the combustible gas remaining in the blast furnace can be continuously discharged to the outside, and the nitrogen pressure inside the blast furnace can be detected, and an alarm is issued when the nitrogen pressure is too high.

Description

Technical Field

[0001] The present invention relates to the technical field of nitrogen pressure gauges, in particular to a precision nitrogen pressure gauge with an overpressure alarm function. Background Art

[0002] Blast furnaces utilize coal gas combustion to create a high-temperature environment suitable for smelting or synthesis reactions. After the blast furnace has completed its operation, a large amount of combustible gas still accumulates within it. If the combustible gas is not promptly vented, an explosion can easily occur when the concentration of the combustible gas reaches a certain level. To ensure the safety of the blast furnace, it is necessary to purge the interior of the blast furnace with non-combustible gases such as nitrogen to reduce the concentration of combustible gases inside the blast furnace. Existing nitrogen purging methods are achieved by repeatedly filling the blast furnace with nitrogen and then evacuating the interior of the blast furnace. This method alternately fills the blast furnace with nitrogen and evacuates the interior, replacing the combustible gas inside with nitrogen. However, the vacuuming operation cannot ensure good airtightness inside the blast furnace, and the residual combustible gas inside the blast furnace cannot be efficiently extracted. This increases the number of nitrogen filling and vacuuming operations, increasing the cost and time of nitrogen purging. If the pressure of the nitrogen filled inside the blast furnace is too high, it will create internal pressure on the blast furnace, which can easily lead to the risk of collapse. Summary of the Invention

[0003] In response to the defects of the prior art, the present invention provides a precision nitrogen pressure gauge with an overpressure alarm function. Pre-cooling treatment is performed according to the internal temperature information of the blast furnace to prevent the combustible gas inside the blast furnace from reigniting and affecting the safety of subsequent purging. At the same time, the internal pressure of the blast furnace can be further reduced by reducing the internal temperature of the blast furnace, thereby reducing the difficulty of subsequent nitrogen filling. According to the real-time air pressure inside the blast furnace, the operating parameters of the nitrogen filling are adjusted to avoid the inability to continue to fill nitrogen as the internal air pressure of the blast furnace increases, thereby reducing the dilution efficiency of the combustible gas inside the blast furnace, and then the interior of the blast furnace is vacuumed to ensure that the combustible gas is extracted from the interior of the blast furnace to the maximum extent. When it is necessary to continue to fill nitrogen, nitrogen filling and exhaust operations are performed on the interior of the blast furnace at the same time, forming a dynamic purge air path inside the blast furnace, so that the combustible gas remaining in the blast furnace can be continuously discharged to the outside, reducing the cost and time of nitrogen purging of the blast furnace, and realizing efficient nitrogen replacement inside the blast furnace. The nitrogen pressure inside the blast furnace can also be detected, and an alarm is issued when the nitrogen pressure is too high to ensure the normal operation of the blast furnace.

[0004] The present invention provides a precision nitrogen pressure gauge with an overpressure alarm function, comprising:

[0005] The blast furnace internal environment identification module is used to determine whether the blast furnace is in a state that allows purge based on the temperature information inside the blast furnace;

[0006] a pre-cooling module, configured to perform pre-cooling on the interior of the blast furnace according to the temperature information and the air pressure information inside the blast furnace when the interior of the blast furnace is not in a state allowing purge;

[0007] The nitrogen charging control module is used to charge nitrogen into the blast furnace when the blast furnace is in a state where purge is allowed, and to adjust the operating parameters of the nitrogen charging according to the real-time gas pressure information inside the blast furnace;

[0008] A vacuum control module is used to perform a vacuum operation on the interior of the blast furnace according to the real-time pressure information inside the blast furnace after the nitrogen filling operation is completed;

[0009] The nitrogen charging control module is further used to determine whether it is necessary to continue the nitrogen charging operation inside the blast furnace according to the concentration information of the combustible gas inside the blast furnace;

[0010] The exhaust operation control module is used to adjust the operating parameters of the exhaust operation inside the blast furnace according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process when it is necessary to continue the nitrogen charging operation;

[0011] Nitrogen pressure detection module, used to detect the nitrogen pressure filled into the blast furnace;

[0012] The alarm module is used to determine whether the interior of the blast furnace is in an overpressure state based on the nitrogen pressure, and to issue an alarm when it is in an overpressure state.

[0013] Furthermore, the blast furnace internal environment identification module is used to determine whether the interior of the blast furnace is in a state allowing purge based on the temperature information inside the blast furnace, including:

[0014] Acquiring temperature information of different areas within the blast furnace over a preset time period, analyzing the temperature information to obtain temperature change information for each area; determining whether the interior of the blast furnace exhibits a cooling trend based on the temperature change information; if so, determining that the interior of the blast furnace is in a state allowing purge; if not, determining that the interior of the blast furnace is not in a state allowing purge;

[0015] The pre-cooling module is used to perform pre-cooling processing on the inside of the blast furnace according to the temperature information and the air pressure information inside the blast furnace when the inside of the blast furnace is not in a state allowing purge, including:

[0016] When the interior of the blast furnace is not in a state where purging is allowed, compressed nitrogen with corresponding temperature and pressure is input into the interior of the blast furnace according to the average temperature and average pressure inside the blast furnace, thereby achieving pre-cooling treatment of the interior of the blast furnace; wherein the temperature of the compressed nitrogen is lower than the average temperature, and the temperature difference between the two is greater than a preset temperature difference threshold; the pressure of the compressed nitrogen is higher than the average pressure, and the pressure difference between the two is less than a preset pressure difference threshold.

[0017] Furthermore, the nitrogen charging control module is used to perform nitrogen charging operation into the blast furnace when the interior of the blast furnace is in a state where purge is allowed, and adjust the operating parameters of the nitrogen charging according to the real-time pressure information inside the blast furnace, including:

[0018] When the interior of the blast furnace is in a state where purging is allowed, nitrogen is first charged into the interior of the blast furnace at a constant charging pressure. When the real-time pressure value inside the blast furnace reaches a first predetermined pressure value, the charging pressure of the nitrogen charging operation is increased.

[0019] The vacuum control module is used to perform a vacuum operation on the inside of the blast furnace according to the real-time pressure information inside the blast furnace after the nitrogen filling operation is completed, including:

[0020] When the real-time pressure value inside the blast furnace reaches a second predetermined pressure value, a vacuum operation is performed on the inside of the blast furnace; wherein the second predetermined pressure value is greater than the first predetermined pressure value;

[0021] The nitrogen charging control module is further used to determine whether it is necessary to continue the nitrogen charging operation inside the blast furnace according to the concentration information of the combustible gas inside the blast furnace, including:

[0022] After the vacuuming operation is completed, if the combustible gas concentration value inside the blast furnace is greater than or equal to the preset concentration threshold, it is determined that the nitrogen filling operation needs to be continued inside the blast furnace.

[0023] Furthermore, the exhaust operation control module is used to adjust the operating parameters of the exhaust operation inside the blast furnace according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process when it is necessary to continue the nitrogen charging operation, including:

[0024] When it is necessary to continue the nitrogen charging operation, determine whether the gas pressure inside the blast furnace during the nitrogen charging process reaches the preset blast furnace gas pressure limit value. If so, perform an exhaust operation on the inside of the blast furnace; and adjust the exhaust rate of the exhaust operation according to the current filling rate of nitrogen, so that the inside of the blast furnace reaches a dynamic equilibrium state of filling and exhausting.

[0025] The present invention provides a control method for a precision nitrogen pressure gauge with an overpressure alarm function, comprising the following steps:

[0026] Step S1, judging whether the interior of the blast furnace is in a state allowing purging based on the temperature information inside the blast furnace; if not, performing a pre-cooling process on the interior of the blast furnace based on the temperature information and the air pressure information inside the blast furnace;

[0027] Step S2: When the interior of the blast furnace is in a state where purge is allowed, nitrogen is charged into the blast furnace, and operating parameters for the nitrogen charging are adjusted according to real-time pressure information inside the blast furnace; vacuuming the interior of the blast furnace is performed according to real-time pressure information inside the blast furnace after the nitrogen charging operation is completed; and determining whether to continue the nitrogen charging operation into the blast furnace according to the concentration information of the combustible gas inside the blast furnace;

[0028] Step S3, when it is necessary to continue the nitrogen charging operation, the operating parameters for the exhaust operation inside the blast furnace are adjusted according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process.

[0029] Furthermore, in step S1, it is determined whether the interior of the blast furnace is in a state allowing purging based on the temperature information inside the blast furnace; if not, a pre-cooling process is performed on the interior of the blast furnace based on the temperature information and the air pressure information inside the blast furnace, including:

[0030] Acquiring temperature information of different areas within the blast furnace over a preset time period, analyzing the temperature information to obtain temperature change information for each area; determining whether the interior of the blast furnace exhibits a cooling trend based on the temperature change information; if so, determining that the interior of the blast furnace is in a state allowing purge; if not, determining that the interior of the blast furnace is not in a state allowing purge;

[0031] When the interior of the blast furnace is not in a state where purging is allowed, compressed nitrogen with corresponding temperature and pressure is input into the interior of the blast furnace according to the average temperature and average pressure inside the blast furnace, thereby achieving pre-cooling treatment of the interior of the blast furnace; wherein the temperature of the compressed nitrogen is lower than the average temperature, and the temperature difference between the two is greater than a preset temperature difference threshold; the pressure of the compressed nitrogen is higher than the average pressure, and the pressure difference between the two is less than a preset pressure difference threshold.

[0032] Furthermore, in step S1, temperature information of different areas inside the blast furnace within a preset time period is obtained, the temperature information is analyzed to obtain temperature change information of each area; and based on the temperature change information, it is determined whether the inside of the blast furnace shows a cooling trend, including:

[0033] Step S1, using the following formula (1), according to the temperature information of different areas inside the blast furnace within a preset length time period, obtain the temperature change information of each area,

[0034]

[0035] In the above formula (1), q(a) represents the temperature change value of the temperature change information of the ath region within a preset time period; K(a) represents the temperature change rate of the temperature change information of the ath region within a preset time period; Q a(t) represents the temperature value of the ath region at the current moment; T represents the preset length of time; Q a (tT) represents the temperature value of the ath region at time tT; Q a (t-2T) represents the temperature value of the ath region at time t-2T;

[0036] Step S2, using the following formula (2), according to the temperature change information of each area and the spatial straight-line distance between the center position of each area inside the blast furnace and the center position inside the blast furnace, the temperature change weight of each area is obtained,

[0037]

[0038] In the above formula (2), G(a) represents the temperature change weight of the ath region; L(a) represents the spatial straight-line distance between the center of the ath region and the center of the blast furnace; n represents the total number of regions in the furnace; || represents the absolute value; W[] represents removing the unit from the value in the brackets and retaining only the value; It means substituting the value of a from 1 to n into the brackets to get the maximum value in the brackets;

[0039] Step S3, using the following formula (3), based on the temperature change weight of each area and the temperature change information of each area, it is determined whether the interior of the blast furnace shows a cooling trend.

[0040]

[0041] In the above formula (3), J represents the judgment value of whether the temperature inside the blast furnace shows a trend of cooling;

[0042] If J = 1, it means that the temperature inside the blast furnace is decreasing;

[0043] If J=0, it means that there is no cooling trend inside the blast furnace.

[0044] Furthermore, in step S2, when the interior of the blast furnace is in a state allowing purging, nitrogen is charged into the interior of the blast furnace, and operating parameters for charging nitrogen are adjusted according to real-time air pressure information inside the blast furnace; vacuuming the interior of the blast furnace is performed according to real-time air pressure information inside the blast furnace after the nitrogen charging operation is completed; and judging whether it is necessary to continue charging nitrogen into the blast furnace according to the concentration information of the combustible gas inside the blast furnace, including:

[0045] When the interior of the blast furnace is in a state where purge is permitted, nitrogen is first charged into the interior of the blast furnace at a constant charging pressure. When the real-time pressure value inside the blast furnace reaches a first predetermined pressure value, the charging pressure of the nitrogen charging operation is increased. When the real-time pressure value inside the blast furnace reaches a second predetermined pressure value, a vacuum operation is performed on the interior of the blast furnace; wherein the second predetermined pressure value is greater than the first predetermined pressure value.

[0046] After the vacuuming operation is completed, if the combustible gas concentration value inside the blast furnace is greater than or equal to the preset concentration threshold, it is determined that the nitrogen filling operation needs to be continued inside the blast furnace.

[0047] Furthermore, in step S3, when it is necessary to continue the nitrogen charging operation, the operating parameters for the exhaust operation inside the blast furnace are adjusted according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process, including:

[0048] When it is necessary to continue the nitrogen charging operation, determine whether the gas pressure inside the blast furnace during the nitrogen charging process reaches the preset blast furnace gas pressure limit value. If so, perform an exhaust operation on the inside of the blast furnace; and adjust the exhaust rate of the exhaust operation according to the current filling rate of nitrogen, so that the inside of the blast furnace reaches a dynamic equilibrium state of filling and exhausting.

[0049] Compared with the existing technology, the precision nitrogen pressure gauge and control method with overpressure alarm function perform pre-cooling treatment according to the internal temperature information of the blast furnace, so as to avoid the re-ignition of the combustible gas inside the blast furnace and affect the safety of subsequent purging. At the same time, by reducing the internal temperature of the blast furnace, the internal pressure of the blast furnace can be further reduced, and the difficulty of subsequent nitrogen filling is reduced; according to the real-time air pressure inside the blast furnace, the operating parameters of the nitrogen filling are adjusted to avoid the inability to continue to fill nitrogen as the internal air pressure of the blast furnace increases, thereby reducing the dilution efficiency of the combustible gas inside the blast furnace, and then the interior of the blast furnace is vacuumed to ensure that the combustible gas is extracted from the interior of the blast furnace to the maximum extent; when it is necessary to continue to fill nitrogen, nitrogen filling and exhaust operations are performed on the interior of the blast furnace at the same time, forming a dynamic purge gas path inside the blast furnace, so that the combustible gas remaining in the blast furnace can be continuously discharged to the outside, reducing the cost and time of nitrogen purging of the blast furnace, and realizing efficient nitrogen replacement inside the blast furnace; the pressure of the nitrogen filled into the blast furnace can also be detected, and an alarm is issued when the nitrogen pressure is too high to ensure the normal operation of the blast furnace.

[0050] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0051] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0053] Figure 1 This is a structural schematic diagram of a precision nitrogen pressure gauge with overpressure alarm function provided by the present invention.

[0054] Figure 2 A flow chart of a control method for a precision nitrogen pressure gauge with an overpressure alarm function provided by the present invention. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] See Figure 1 , is a schematic diagram of the structure of a precision nitrogen pressure gauge with an overpressure alarm function provided by an embodiment of the present invention. The precision nitrogen pressure gauge with an overpressure alarm function includes:

[0057] The blast furnace internal environment identification module is used to determine whether the blast furnace is in a state that allows purge based on the temperature information inside the blast furnace;

[0058] A pre-cooling module is used to pre-cool the interior of the blast furnace according to the temperature information and the air pressure information inside the blast furnace when the interior of the blast furnace is not in a state where purge is allowed;

[0059] The nitrogen charging control module is used to charge nitrogen into the blast furnace when the blast furnace is in a state where purge is allowed, and to adjust the operating parameters of the nitrogen charging according to the real-time gas pressure information inside the blast furnace;

[0060] A vacuum control module is used to perform a vacuum operation on the interior of the blast furnace according to the real-time pressure information inside the blast furnace after the nitrogen filling operation is completed;

[0061] The nitrogen filling control module is also used to determine whether it is necessary to continue the nitrogen filling operation inside the blast furnace based on the concentration information of the combustible gas inside the blast furnace;

[0062] The exhaust operation control module is used to adjust the operating parameters of the exhaust operation inside the blast furnace according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process when it is necessary to continue the nitrogen charging operation;

[0063] Nitrogen pressure detection module, used to detect the nitrogen pressure filled into the blast furnace;

[0064] The alarm module is used to determine whether the interior of the blast furnace is in an overpressure state based on the nitrogen pressure, and to issue an alarm when it is in an overpressure state.

[0065] The beneficial effects of the above technical solution are as follows: the precision nitrogen pressure gauge with overpressure alarm function performs pre-cooling treatment according to the internal temperature information of the blast furnace, so as to avoid the re-ignition of the combustible gas inside the blast furnace and affect the safety of subsequent purging. At the same time, by reducing the internal temperature of the blast furnace, the internal pressure of the blast furnace can be further reduced, thereby reducing the difficulty of subsequent nitrogen filling; according to the real-time air pressure inside the blast furnace, the operating parameters of the nitrogen filling are adjusted to avoid the inability to continue to fill nitrogen as the internal air pressure of the blast furnace increases, thereby reducing the dilution efficiency of the combustible gas inside the blast furnace, and then the interior of the blast furnace is vacuumed to ensure that the combustible gas is extracted from the interior of the blast furnace to the maximum extent; when it is necessary to continue to fill nitrogen, nitrogen filling and exhaust operations are performed on the interior of the blast furnace at the same time, forming a dynamic purge gas path inside the blast furnace, so that the combustible gas remaining in the blast furnace can be continuously discharged to the outside, reducing the cost and time of nitrogen purging of the blast furnace, and realizing efficient nitrogen replacement inside the blast furnace; the nitrogen pressure inside the blast furnace can also be detected, and an alarm is issued when the nitrogen pressure is too high to ensure the normal operation of the blast furnace.

[0066] Preferably, the blast furnace internal environment identification module is used to determine whether the interior of the blast furnace is in a state allowing purge based on the temperature information inside the blast furnace, including:

[0067] Acquire temperature information of different areas within the blast furnace over a preset time period, analyze the temperature information, and obtain temperature change information for each area; determine whether the interior of the blast furnace is showing a cooling trend based on the temperature change information; if so, determine that the interior of the blast furnace is in a state where purge is permitted; if not, determine that the interior of the blast furnace is not in a state where purge is permitted;

[0068] The pre-cooling module is used to pre-cool the interior of the blast furnace according to the temperature information and the air pressure information inside the blast furnace when the interior of the blast furnace is not in a state where purge is allowed, including:

[0069] When the interior of the blast furnace is not in a state where purging is allowed, compressed nitrogen with corresponding temperature and pressure is input into the interior of the blast furnace according to the average temperature and average pressure inside the blast furnace, thereby achieving pre-cooling treatment of the interior of the blast furnace; wherein the temperature of the compressed nitrogen is lower than the average temperature, and the temperature difference between the two is greater than a preset temperature difference threshold; the pressure of the compressed nitrogen is higher than the average pressure, and the pressure difference between the two is less than a preset pressure difference threshold.

[0070] The beneficial effect of the above technical solution is that after the blast furnace is completed, a large amount of high-temperature gas is present inside the blast furnace. This high-pressure gas is relatively high. If the blast furnace is directly filled with room-temperature nitrogen at this time, it will generate a huge pressure inside the blast furnace, causing deformation or even collapse of the high-pressure structure. In addition, this high-pressure high-temperature gas also increases the difficulty of filling the blast furnace with nitrogen, requiring the nitrogen to have a higher pressure to ensure the filling efficiency. The temperature inside the blast furnace is detected, and the temperature data of different areas inside the blast furnace within a preset time period are collected. The collected temperature data are then analyzed to obtain the temperature change rate of each area. If the temperature change rate is negative and less than the preset change rate threshold, it indicates that the interior of the blast furnace is showing a cooling trend. At this time, it is allowed to fill the blast furnace with normal temperature nitrogen to purge the interior of the blast furnace; otherwise, it indicates that the interior of the blast furnace is not showing a cooling trend. At this time, it is not allowed to fill the blast furnace with normal temperature nitrogen to purge the interior of the blast furnace. In this way, the average temperature and average air pressure inside the blast furnace are obtained, and compressed nitrogen with a lower temperature is input into the blast furnace accordingly. This can quickly cool the interior of the blast furnace, making it convenient for the subsequent timely nitrogen purge of the interior of the blast furnace.

[0071] Preferably, the nitrogen charging control module is used to perform nitrogen charging operation into the blast furnace when the interior of the blast furnace is in a state allowing purge, and adjust the operating parameters of the nitrogen charging according to the real-time gas pressure information inside the blast furnace, including:

[0072] When the interior of the blast furnace is in a state where purging is allowed, nitrogen is first charged into the interior of the blast furnace at a constant charging pressure. When the real-time pressure value inside the blast furnace reaches a first predetermined pressure value, the charging pressure of the nitrogen charging operation is increased.

[0073] The vacuum control module is used to perform vacuum operation inside the blast furnace according to the real-time pressure information inside the blast furnace after the nitrogen filling operation is completed, including:

[0074] When the real-time pressure value inside the blast furnace reaches a second predetermined pressure value, a vacuum operation is performed on the inside of the blast furnace; wherein the second predetermined pressure value is greater than the first predetermined pressure value;

[0075] The nitrogen charging control module is also used to determine whether it is necessary to continue the nitrogen charging operation inside the blast furnace based on the concentration information of the combustible gas inside the blast furnace, including:

[0076] After the vacuuming operation is completed, if the combustible gas concentration value inside the blast furnace is greater than or equal to the preset concentration threshold, it is determined that the nitrogen filling operation inside the blast furnace needs to be continued.

[0077] The beneficial effects of the above technical solution are as follows: in the initial stage of nitrogen purging inside the blast furnace, the concentration of combustible gas inside the blast furnace is relatively high. Therefore, when nitrogen is first charged into the blast furnace, it is necessary to charge as much nitrogen as possible to the maximum extent possible so that the nitrogen can fully dilute the combustible gas inside the blast furnace. The nitrogen charging operation is first performed on the blast furnace at a constant charging pressure, which can ensure that the nitrogen is charged into the blast furnace at a steady speed. As the nitrogen inside the blast furnace continues to accumulate, the air pressure inside the blast furnace also continues to increase. If the original charging pressure is continued, it will be impossible to ensure that the nitrogen is effectively charged into the blast furnace. At this time, the charging pressure needs to be increased. When the air pressure inside the blast furnace reaches the limit value (corresponding to the second predetermined pressure value), it indicates that the nitrogen charged into the blast furnace has reached a saturated state. At this time, the interior of the blast furnace needs to be vacuumed to extract the original combustible gas inside the blast furnace.

[0078] Preferably, the exhaust operation control module is used to adjust the operating parameters of the exhaust operation inside the blast furnace according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process when it is necessary to continue the nitrogen charging operation, including:

[0079] When it is necessary to continue the nitrogen charging operation, determine whether the gas pressure inside the blast furnace during the nitrogen charging process reaches the preset blast furnace gas pressure limit value. If so, perform an exhaust operation on the inside of the blast furnace; and adjust the exhaust rate of the exhaust operation according to the current filling rate of nitrogen, so that the inside of the blast furnace reaches a dynamic equilibrium state of filling and exhausting.

[0080] The beneficial effect of the above technical solution is: when it is necessary to continue to fill nitrogen into the blast furnace to purge the combustible gas, a dynamic method of simultaneously filling nitrogen and exhausting the interior of the blast furnace is adopted to further discharge the combustible gas inside the blast furnace. At this time, the exhaust rate of the exhaust operation is adjusted according to the current filling rate of nitrogen, so that the interior of the blast furnace reaches a dynamic equilibrium state of filling and exhausting, which can ensure that the residual combustible gas inside the blast furnace is continuously and stably replaced and discharged.

[0081] See Figure 2 , is a flow chart of a control method for a precision nitrogen pressure gauge with an overpressure alarm function provided by an embodiment of the present invention. The control method for a precision nitrogen pressure gauge with an overpressure alarm function comprises the following steps:

[0082] Step S1, judging whether the interior of the blast furnace is in a state allowing purging based on the temperature information inside the blast furnace; if not, performing a pre-cooling process on the interior of the blast furnace based on the temperature information and the air pressure information inside the blast furnace;

[0083] Step S2: When the interior of the blast furnace is in a state where purge is allowed, nitrogen is charged into the blast furnace, and operating parameters for the nitrogen charging are adjusted according to real-time pressure information inside the blast furnace; vacuuming the interior of the blast furnace is performed according to real-time pressure information inside the blast furnace after the nitrogen charging operation is completed; and determining whether to continue the nitrogen charging operation into the blast furnace according to the concentration information of the combustible gas inside the blast furnace;

[0084] Step S3, when it is necessary to continue the nitrogen charging operation, the operating parameters for the exhaust operation inside the blast furnace are adjusted according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process.

[0085] The beneficial effects of the above technical solution are as follows: the control method of the precision nitrogen pressure gauge with overpressure alarm function performs pre-cooling treatment according to the internal temperature information of the blast furnace, so as to avoid the re-ignition of the combustible gas inside the blast furnace and affect the safety of subsequent purging. At the same time, by reducing the internal temperature of the blast furnace, the internal pressure of the blast furnace can be further reduced, thereby reducing the difficulty of subsequent nitrogen filling; according to the real-time air pressure inside the blast furnace, the operating parameters of the nitrogen filling are adjusted to avoid the inability to continue to fill nitrogen as the internal air pressure of the blast furnace increases, thereby reducing the dilution efficiency of the combustible gas inside the blast furnace, and then vacuuming the interior of the blast furnace to ensure that the combustible gas is extracted from the interior of the blast furnace to the maximum extent; when it is necessary to continue to fill nitrogen, nitrogen filling and exhaust operations are performed on the interior of the blast furnace at the same time, forming a dynamic purge gas path inside the blast furnace, so that the combustible gas remaining in the blast furnace can be continuously discharged to the outside, reducing the cost and time of nitrogen purging of the blast furnace, and realizing efficient nitrogen replacement inside the blast furnace; the nitrogen pressure inside the blast furnace can also be detected, and an alarm is issued when the nitrogen pressure is too high to ensure the normal operation of the blast furnace.

[0086] Preferably, in step S1, whether the interior of the blast furnace is in a state allowing purging is determined based on the temperature information inside the blast furnace; if not, pre-cooling the interior of the blast furnace is performed based on the temperature information and the air pressure information inside the blast furnace, including:

[0087] Acquire temperature information of different areas within the blast furnace over a preset time period, analyze the temperature information, and obtain temperature change information for each area; determine whether the interior of the blast furnace is showing a cooling trend based on the temperature change information; if so, determine that the interior of the blast furnace is in a state where purge is permitted; if not, determine that the interior of the blast furnace is not in a state where purge is permitted;

[0088] When the interior of the blast furnace is not in a state where purging is allowed, compressed nitrogen with corresponding temperature and pressure is input into the interior of the blast furnace according to the average temperature and average pressure inside the blast furnace, thereby achieving pre-cooling treatment of the interior of the blast furnace; wherein the temperature of the compressed nitrogen is lower than the average temperature, and the temperature difference between the two is greater than a preset temperature difference threshold; the pressure of the compressed nitrogen is higher than the average pressure, and the pressure difference between the two is less than a preset pressure difference threshold.

[0089] The beneficial effect of the above technical solution is that after the blast furnace is completed, a large amount of high-temperature gas is present inside the blast furnace. This high-pressure gas is relatively high. If the blast furnace is directly filled with room-temperature nitrogen at this time, it will generate a huge pressure inside the blast furnace, causing deformation or even collapse of the high-pressure structure. In addition, this high-pressure high-temperature gas also increases the difficulty of filling the blast furnace with nitrogen, requiring the nitrogen to have a higher pressure to ensure the filling efficiency. The temperature inside the blast furnace is detected, and the temperature data of different areas inside the blast furnace within a preset time period are collected. The collected temperature data are then analyzed to obtain the temperature change rate of each area. If the temperature change rate is negative and less than the preset change rate threshold, it indicates that the interior of the blast furnace is showing a cooling trend. At this time, it is allowed to fill the blast furnace with normal temperature nitrogen to purge the interior of the blast furnace; otherwise, it indicates that the interior of the blast furnace is not showing a cooling trend. At this time, it is not allowed to fill the blast furnace with normal temperature nitrogen to purge the interior of the blast furnace. In this way, the average temperature and average air pressure inside the blast furnace are obtained, and compressed nitrogen with a lower temperature is input into the blast furnace accordingly. This can quickly cool the interior of the blast furnace, making it convenient for the subsequent timely nitrogen purge of the interior of the blast furnace.

[0090] Preferably, in step S1, temperature information of different areas inside the blast furnace within a preset time period is obtained, the temperature information is analyzed to obtain temperature change information of each area; and based on the temperature change information, it is determined whether the inside of the blast furnace shows a cooling trend, including:

[0091] Step S1, using the following formula (1), according to the temperature information of different areas inside the blast furnace within a preset length time period, obtain the temperature change information of each area,

[0092]

[0093] In the above formula (1), q(a) represents the temperature change value of the temperature change information of the ath region within a preset time period; K(a) represents the temperature change rate of the temperature change information of the ath region within a preset time period; Q a (t) represents the temperature value of the ath region at the current moment; T represents the preset length of time; Q a (tT) represents the temperature value of the ath region at time tT; Q a(t-2T) represents the temperature value of the ath region at time t-2T;

[0094] Step S2, using the following formula (2), according to the temperature change information of each area and the spatial straight-line distance between the center position of each area inside the blast furnace and the center position inside the blast furnace, the temperature change weight of each area is obtained,

[0095]

[0096] In the above formula (2), G(a) represents the temperature change weight of the ath region; L(a) represents the spatial straight-line distance between the center of the ath region and the center of the blast furnace; n represents the total number of regions in the furnace; || represents the absolute value; W[] represents removing the unit from the value in the brackets and retaining only the value; It means substituting the value of a from 1 to n into the brackets to get the maximum value in the brackets;

[0097] Step S3, using the following formula (3), based on the temperature change weight of each area and the temperature change information of each area, it is determined whether the interior of the blast furnace shows a cooling trend.

[0098]

[0099] In the above formula (3), J represents the judgment value of whether the temperature inside the blast furnace shows a trend of cooling;

[0100] If J = 1, it means that the temperature inside the blast furnace is decreasing;

[0101] If J=0, it means that there is no cooling trend inside the blast furnace.

[0102] The beneficial effects of the above technical solution are as follows: using the above formula (1), according to the temperature information of different areas inside the blast furnace within a preset length time period, the temperature change information of each area is obtained, and then the local temperature change situation is known, which is convenient for subsequent analysis and judgment; then using the above formula (2), according to the temperature change information of each area and the spatial straight-line distance between the center position of each area inside the blast furnace and the center position of the blast furnace, the temperature change weight of each area is obtained, and according to the position of each area and the speed of temperature change of each area, the proportion of each area to the overall temperature regulation inside the blast furnace is analyzed, so that the overall temperature change situation inside the blast furnace can be more accurately reflected; finally, using the above formula (3), according to the temperature change weight of each area and the temperature change information of each area, it is judged whether the inside of the blast furnace shows a cooling trend, so as to make accurate and reliable judgments and ensure the accuracy and reliability of the system.

[0103] Preferably, in step S2, when the interior of the blast furnace is in a state allowing purging, nitrogen is charged into the blast furnace, and operating parameters for charging nitrogen are adjusted according to real-time air pressure information inside the blast furnace; vacuuming the interior of the blast furnace is performed according to real-time air pressure information inside the blast furnace after the nitrogen charging operation is completed; and judging whether it is necessary to continue the nitrogen charging operation into the blast furnace according to the concentration information of the combustible gas inside the blast furnace, including:

[0104] When the interior of the blast furnace is in a state allowing purging, nitrogen is first charged into the interior of the blast furnace at a constant charging pressure. When the real-time pressure value inside the blast furnace reaches a first predetermined pressure value, the charging pressure of the nitrogen charging operation is increased. When the real-time pressure value inside the blast furnace reaches a second predetermined pressure value, a vacuum operation is performed on the interior of the blast furnace; wherein the second predetermined pressure value is greater than the first predetermined pressure value.

[0105] After the vacuuming operation is completed, if the combustible gas concentration value inside the blast furnace is greater than or equal to the preset concentration threshold, it is determined that the nitrogen filling operation inside the blast furnace needs to be continued.

[0106] The beneficial effects of the above technical solution are as follows: in the initial stage of nitrogen purging inside the blast furnace, the concentration of combustible gas inside the blast furnace is relatively high. Therefore, when nitrogen is first charged into the blast furnace, it is necessary to charge as much nitrogen as possible to the maximum extent possible so that the nitrogen can fully dilute the combustible gas inside the blast furnace. The nitrogen charging operation is first performed on the blast furnace at a constant charging pressure, which can ensure that the nitrogen is charged into the blast furnace at a steady speed. As the nitrogen inside the blast furnace continues to accumulate, the air pressure inside the blast furnace also continues to increase. If the original charging pressure is continued, it will be impossible to ensure that the nitrogen is effectively charged into the blast furnace. At this time, the charging pressure needs to be increased. When the air pressure inside the blast furnace reaches the limit value (corresponding to the second predetermined pressure value), it indicates that the nitrogen charged into the blast furnace has reached a saturated state. At this time, the interior of the blast furnace needs to be vacuumed to extract the original combustible gas inside the blast furnace.

[0107] Preferably, in step S3, when it is necessary to continue the nitrogen charging operation, the operating parameters of the exhaust operation inside the blast furnace are adjusted according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process, including:

[0108] When it is necessary to continue the nitrogen charging operation, determine whether the gas pressure inside the blast furnace during the nitrogen charging process reaches the preset blast furnace gas pressure limit value. If so, perform an exhaust operation on the inside of the blast furnace; and adjust the exhaust rate of the exhaust operation according to the current filling rate of nitrogen, so that the inside of the blast furnace reaches a dynamic equilibrium state of filling and exhausting.

[0109] The beneficial effect of the above technical solution is: when it is necessary to continue to fill nitrogen into the blast furnace to purge the combustible gas, a dynamic method of simultaneously filling nitrogen and exhausting the interior of the blast furnace is adopted to further discharge the combustible gas inside the blast furnace. At this time, the exhaust rate of the exhaust operation is adjusted according to the current filling rate of nitrogen, so that the interior of the blast furnace reaches a dynamic equilibrium state of filling and exhausting, which can ensure that the residual combustible gas inside the blast furnace is continuously and stably replaced and discharged.

[0110] As can be seen from the contents of the above embodiments, the precision nitrogen pressure gauge and control method with overpressure alarm function are pre-cooled according to the internal temperature information of the blast furnace to avoid the combustible gas inside the blast furnace from reigniting and affecting the safety of subsequent purge. At the same time, the internal pressure of the blast furnace can be further reduced by reducing the internal temperature of the blast furnace, thereby reducing the difficulty of subsequent nitrogen filling; according to the real-time air pressure inside the blast furnace, the operating parameters of the nitrogen filling are adjusted to avoid the inability to continue to fill nitrogen as the internal air pressure of the blast furnace increases, thereby reducing the dilution efficiency of the combustible gas inside the blast furnace, and then the interior of the blast furnace is vacuumed to ensure that the combustible gas is extracted from the interior of the blast furnace to the maximum extent; when it is necessary to continue to fill nitrogen, nitrogen filling and exhaust operations are performed on the interior of the blast furnace at the same time, forming a dynamic purge gas path inside the blast furnace, so that the combustible gas remaining in the blast furnace can be continuously discharged to the outside, reducing the cost and time of nitrogen purge of the blast furnace, and realizing efficient nitrogen replacement of the interior of the blast furnace; the nitrogen pressure inside the blast furnace can also be detected, and an alarm is issued when the nitrogen pressure is too high to ensure the normal operation of the blast furnace.

[0111] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. Precision nitrogen pressure gauge with overpressure alarm function, characterized by: include: The blast furnace internal environment identification module is used to determine whether the blast furnace is in a state that allows purge based on the temperature information inside the blast furnace; a pre-cooling module, configured to perform pre-cooling on the interior of the blast furnace according to the temperature information and the air pressure information inside the blast furnace when the interior of the blast furnace is not in a state allowing purge; The nitrogen charging control module is used to charge nitrogen into the blast furnace when the blast furnace is in a state where purge is allowed, and to adjust the operating parameters of the nitrogen charging according to the real-time gas pressure information inside the blast furnace; A vacuum control module is used to perform a vacuum operation on the interior of the blast furnace according to the real-time pressure information inside the blast furnace after the nitrogen filling operation is completed; The nitrogen charging control module is further used to determine whether it is necessary to continue the nitrogen charging operation inside the blast furnace according to the concentration information of the combustible gas inside the blast furnace; The exhaust operation control module is used to adjust the operating parameters of the exhaust operation inside the blast furnace according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process when it is necessary to continue the nitrogen charging operation; Nitrogen pressure detection module, used to detect the nitrogen pressure filled into the blast furnace; The alarm module is used to determine whether the interior of the blast furnace is in an overpressure state based on the nitrogen pressure, and to issue an alarm when it is in an overpressure state.

2. The precision nitrogen pressure gauge with overpressure alarm function according to claim 1, characterized in that: The blast furnace internal environment identification module is used to determine whether the interior of the blast furnace is in a state allowing purge based on the temperature information inside the blast furnace, including: Acquiring temperature information of different areas within the blast furnace over a preset time period, analyzing the temperature information to obtain temperature change information for each area; determining whether the interior of the blast furnace exhibits a cooling trend based on the temperature change information; if so, determining that the interior of the blast furnace is in a state allowing purge; if not, determining that the interior of the blast furnace is not in a state allowing purge; The pre-cooling module is used to perform pre-cooling processing on the inside of the blast furnace according to the temperature information and the air pressure information inside the blast furnace when the inside of the blast furnace is not in a state allowing purge, including: When the interior of the blast furnace is not in a state where purging is allowed, compressed nitrogen with corresponding temperature and pressure is input into the interior of the blast furnace according to the average temperature and average pressure inside the blast furnace, thereby achieving pre-cooling treatment of the interior of the blast furnace; wherein the temperature of the compressed nitrogen is lower than the average temperature, and the temperature difference between the two is greater than a preset temperature difference threshold; the pressure of the compressed nitrogen is higher than the average pressure, and the pressure difference between the two is less than a preset pressure difference threshold.

3. The precision nitrogen pressure gauge with overpressure alarm function according to claim 1, characterized in that: The nitrogen charging control module is used to perform nitrogen charging operation on the inside of the blast furnace when the inside of the blast furnace is in a state allowing purge, and adjust the operating parameters of the nitrogen charging according to the real-time air pressure information inside the blast furnace, including: When the interior of the blast furnace is in a state where purging is allowed, nitrogen is first charged into the interior of the blast furnace at a constant charging pressure. When the real-time pressure value inside the blast furnace reaches a first predetermined pressure value, the charging pressure of the nitrogen charging operation is increased. The vacuum control module is used to perform a vacuum operation on the inside of the blast furnace according to the real-time pressure information inside the blast furnace after the nitrogen filling operation is completed, including: When the real-time pressure value inside the blast furnace reaches a second predetermined pressure value, a vacuum operation is performed on the inside of the blast furnace; wherein the second predetermined pressure value is greater than the first predetermined pressure value; The nitrogen charging control module is further used to determine whether it is necessary to continue the nitrogen charging operation inside the blast furnace according to the concentration information of the combustible gas inside the blast furnace, including: After the vacuuming operation is completed, if the combustible gas concentration value inside the blast furnace is greater than or equal to the preset concentration threshold, it is determined that the nitrogen filling operation needs to be continued inside the blast furnace.

4. The precision nitrogen pressure gauge with overpressure alarm function according to claim 1, characterized in that: The exhaust operation control module is used to adjust the operating parameters of the exhaust operation inside the blast furnace according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process when it is necessary to continue the nitrogen charging operation, including: When it is necessary to continue the nitrogen charging operation, determine whether the gas pressure inside the blast furnace during the nitrogen charging process reaches the preset blast furnace gas pressure limit value. If so, perform an exhaust operation on the inside of the blast furnace; and adjust the exhaust rate of the exhaust operation according to the current filling rate of nitrogen, so that the inside of the blast furnace reaches a dynamic equilibrium state of filling and exhausting.

5. The control method of a precision nitrogen pressure gauge with an overpressure alarm function according to any one of claims 1 to 4, characterized in that: The steps include: Step S1, judging whether the interior of the blast furnace is in a state allowing purging based on the temperature information inside the blast furnace; if not, performing a pre-cooling process on the interior of the blast furnace based on the temperature information and the air pressure information inside the blast furnace; Step S2: When the interior of the blast furnace is in a state where purge is allowed, nitrogen is charged into the blast furnace, and operating parameters for the nitrogen charging are adjusted according to real-time pressure information inside the blast furnace; vacuuming the interior of the blast furnace is performed according to real-time pressure information inside the blast furnace after the nitrogen charging operation is completed; and determining whether to continue the nitrogen charging operation into the blast furnace according to the concentration information of the combustible gas inside the blast furnace; Step S3, when it is necessary to continue the nitrogen charging operation, the operating parameters for the exhaust operation inside the blast furnace are adjusted according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process.

6. The control method of the precision nitrogen pressure gauge with overpressure alarm function according to claim 5, characterized in that: In step S1, it is determined whether the interior of the blast furnace is in a state allowing purging based on the temperature information inside the blast furnace; if not, a pre-cooling process is performed on the interior of the blast furnace based on the temperature information and the air pressure information inside the blast furnace, including: Acquiring temperature information of different areas within the blast furnace over a preset time period, analyzing the temperature information to obtain temperature change information for each area; determining whether the interior of the blast furnace exhibits a cooling trend based on the temperature change information; if so, determining that the interior of the blast furnace is in a state allowing purge; if not, determining that the interior of the blast furnace is not in a state allowing purge; When the interior of the blast furnace is not in a state where purging is allowed, compressed nitrogen with corresponding temperature and pressure is input into the interior of the blast furnace according to the average temperature and average pressure inside the blast furnace, thereby achieving pre-cooling treatment of the interior of the blast furnace; wherein the temperature of the compressed nitrogen is lower than the average temperature, and the temperature difference between the two is greater than a preset temperature difference threshold; the pressure of the compressed nitrogen is higher than the average pressure, and the pressure difference between the two is less than a preset pressure difference threshold.

7. The control method of the precision nitrogen pressure gauge with overpressure alarm function according to claim 6, characterized in that: In step S1, temperature information of different areas inside the blast furnace within a preset time period is obtained, and the temperature information is analyzed to obtain temperature change information of each area; Judging whether the interior of the blast furnace shows a cooling trend based on the temperature change information includes: Step S1, using the following formula (1), based on the temperature information of different areas inside the blast furnace within a preset time period, obtain the temperature change information of each area, In the above formula (1), q(a) represents the temperature change value of the temperature change information of the ath region within a preset time period; K(a) represents the temperature change rate of the temperature change information of the ath region within a preset time period; Q a (t) represents the temperature value of the ath region at the current moment; T represents the preset length of time; Q a (tT) represents the temperature value of the ath region at time tT; Q a (t-2T) represents the temperature value of the ath region at time t-2T; Step S2, using the following formula (2), according to the temperature change information of each area and the spatial straight-line distance between the center position of each area inside the blast furnace and the center position inside the blast furnace, the temperature change weight of each area is obtained, In the above formula (2), G(a) represents the temperature change weight of the ath region; L(a) represents the spatial straight-line distance between the center of the ath region and the center of the blast furnace; n represents the total number of regions in the furnace; || represents the absolute value; W[] represents removing the unit from the value in the brackets and retaining only the value; It means substituting the value of a from 1 to n into the brackets to get the maximum value in the brackets; Step S3, using the following formula (3), based on the temperature change weight of each area and the temperature change information of each area, it is determined whether the interior of the blast furnace shows a cooling trend. In the above formula (3), J represents the judgment value of whether the temperature inside the blast furnace shows a trend of cooling; If J=1, it means that the temperature inside the blast furnace is decreasing.

8. The control method of the precision nitrogen pressure gauge with overpressure alarm function according to claim 5, characterized in that: In step S2, when the interior of the blast furnace is in a state allowing purging, nitrogen is charged into the blast furnace, and operating parameters for charging nitrogen are adjusted according to real-time pressure information inside the blast furnace; and vacuuming the interior of the blast furnace is performed according to real-time pressure information inside the blast furnace after the nitrogen charging operation is completed; And according to the concentration information of the combustible gas inside the blast furnace, it is judged whether it is necessary to continue the nitrogen filling operation inside the blast furnace, including: When the interior of the blast furnace is in a state where purge is permitted, nitrogen is first charged into the interior of the blast furnace at a constant charging pressure. When the real-time pressure value inside the blast furnace reaches a first predetermined pressure value, the charging pressure of the nitrogen charging operation is increased. When the real-time pressure value inside the blast furnace reaches a second predetermined pressure value, a vacuum operation is performed on the interior of the blast furnace; wherein the second predetermined pressure value is greater than the first predetermined pressure value. After the vacuuming operation is completed, if the combustible gas concentration value inside the blast furnace is greater than or equal to the preset concentration threshold, it is determined that the nitrogen filling operation needs to be continued inside the blast furnace.

9. The control method of the precision nitrogen pressure gauge with overpressure alarm function according to claim 5, characterized in that: In step S3, when it is necessary to continue the nitrogen charging operation, the operating parameters for the exhaust operation inside the blast furnace are adjusted according to the nitrogen charging parameters inside the blast furnace during the nitrogen charging process, including: When it is necessary to continue the nitrogen charging operation, determine whether the gas pressure inside the blast furnace during the nitrogen charging process reaches the preset blast furnace gas pressure limit value. If so, perform an exhaust operation on the inside of the blast furnace; and adjust the exhaust rate of the exhaust operation according to the current filling rate of nitrogen, so that the inside of the blast furnace reaches a dynamic equilibrium state of filling and exhausting.

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