Automatic control system and method for coal gas utilization

Abstract

According to the automatic control system and method for coal gas utilization, a controller can obtain coal gas heat needed by a target link, the flow of coke oven gas detected by a coke oven gas control system is obtained, and the coke oven gas is pressurized based on the coke oven gas control system. And according to the heat of the coke oven gas and the required gas heat, carrying out calorific value proportion calculation to obtain the required flow of the blast furnace gas. And controlling the blast furnace gas control system based on the required flow of the blast furnace gas, so that the actual flow of the blast furnace gas is consistent with the required flow. In the scheme, the coke oven gas is firstly pressurized and then is mixed with the blast furnace gas after flow regulation, so that the requirement of required heat can be met, the production rhythm is prevented from being abnormal, and the product quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and in particular to a gas utilization automatic control system and method. Background Art

[0002] As a fuel, gas is widely used in industrial production and daily life, including in industries such as steel, chemicals, and ceramics, as well as in daily life scenarios such as cooking and heating. When gas is used in industrial production, different factories may have different demands for the heat generated by gas due to different production goals and production conditions, and different production links in the production process may also have different demands for heat.

[0003] In the existing gas control system, it is often necessary to set up a heat detector at the gas outlet to detect the heat, so as to determine whether the specific heat demand can be met. However, this method can only provide uniform heat, which is difficult to meet the different needs of different factories and different production links for gas heat, which may lead to abnormal production rhythm and product quality cannot be guaranteed. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a gas utilization automatic control system and method to meet the required heat demand, avoid abnormal production rhythm, and ensure product quality.

[0005] In a first aspect, the present invention provides a gas utilization automatic control system, the gas utilization automatic control system comprising a controller and a coke oven gas control system and a blast furnace gas control system respectively connected to the controller, the controller being used to:

[0006] Obtain the gas heat required for the target link;

[0007] Obtaining the flow rate of coke oven gas detected by the coke oven gas control system, and pressurizing the coke oven gas based on the coke oven gas control system;

[0008] The required flow rate of blast furnace gas is obtained by calculating the calorific value ratio according to the heat of the coke oven gas and the required heat of the gas;

[0009] The blast furnace gas control system is controlled based on the required flow rate of the blast furnace gas so that the actual flow rate of the blast furnace gas is consistent with the required flow rate of the blast furnace gas.

[0010] In an optional embodiment, the coke oven gas control system includes a coke oven gas pipeline, the blast furnace gas control system includes a blast furnace gas pipeline, and the gas utilization automatic control system further includes a mixing pipeline connected to the coke oven gas pipeline and the blast furnace gas pipeline respectively;

[0011] The controller is used to pressurize the coke oven gas in the following manner:

[0012] Obtaining the real-time pressure at the mixing pipeline and obtaining the target pressure;

[0013] The pressure in the coke oven gas pipeline is adjusted according to the real-time pressure and the target pressure and based on the coke oven gas control system, so that after the pressurized coke oven gas in the coke oven gas pipeline and the blast furnace gas in the blast furnace gas pipeline enter the mixing pipeline and merge, the real-time pressure in the mixing pipeline reaches the target pressure.

[0014] In an optional embodiment, the controller is used to adjust the pressure in the coke oven gas pipeline based on the coke oven gas control system in the following manner:

[0015] Calculating a pressure deviation between the real-time pressure and the target pressure;

[0016] A first adjustment amount is obtained according to the pressure deviation, and the pressure in the coke oven gas pipeline is adjusted according to the first adjustment amount and based on the coke oven gas control system.

[0017] In an optional implementation manner, the controller is used to obtain the first adjustment amount in the following manner:

[0018] When the pressure deviation exceeds a preset range, determining a target pressure setting range to which the pressure deviation belongs within a plurality of preset pressure setting ranges;

[0019] When it is monitored that the pressure remains at the real-time pressure for more than the first preset time, a first adjustment amount corresponding to the target pressure setting range is obtained.

[0020] In an optional embodiment, the blast furnace gas control system further comprises a flow regulating valve disposed in the blast furnace gas pipeline;

[0021] The controller is used to control the blast furnace gas control system in the following manner:

[0022] Calculating the flow difference between the required flow rate of the blast furnace gas and the actual flow rate;

[0023] A second adjustment amount is obtained based on the flow difference, and the flow control valve is adjusted based on the second adjustment amount.

[0024] In an optional implementation manner, the controller is used to obtain the second adjustment amount in the following manner:

[0025] Determine a target flow setting range to which the flow difference belongs within a plurality of preset flow setting ranges;

[0026] When it is monitored that the actual flow rate is still maintained for more than the second preset time, a second adjustment amount corresponding to the target flow rate setting range is obtained.

[0027] In an optional implementation, the controller is used to adjust the flow control valve based on the second adjustment amount in the following manner:

[0028] Based on the maximum opening and minimum opening of the flow control valve, as well as the maximum flow value corresponding to the maximum opening and the minimum flow value corresponding to the minimum opening;

[0029] The unit flow value corresponding to the unit opening of the flow control valve is calculated based on the maximum opening, the minimum opening, the maximum flow value and the minimum flow value;

[0030] The flow regulating valve is adjusted according to the unit flow value and the second adjustment amount.

[0031] In an optional implementation manner, the controller is used to adjust the flow regulating valve according to the unit flow value and the second adjustment amount in the following manner:

[0032] Calculating a multiple of the second adjustment amount relative to the unit flow value;

[0033] The adjustment opening is calculated according to the multiple and the unit opening;

[0034] Based on the adjustment opening, the adjustment is performed on the basis of the current opening of the flow control valve.

[0035] In an optional embodiment, the coke oven gas pipeline comprises a first coke oven gas pipeline and a second coke oven gas pipeline, and the cross-sectional area of ​​the first coke oven gas pipeline is greater than the cross-sectional area of ​​the second coke oven gas pipeline;

[0036] The blast furnace gas pipeline comprises a first blast furnace gas pipeline and a second blast furnace gas pipeline, and the cross-sectional area of ​​the first blast furnace gas pipeline is greater than the cross-sectional area of ​​the second blast furnace gas pipeline;

[0037] The controller is used to adjust the pressure of the coke oven gas in the first coke oven gas pipeline based on the coke oven gas control system, and to adjust the flow rate of the blast furnace gas in the second blast furnace gas pipeline based on the blast furnace gas control system.

[0038] In a second aspect, the present invention provides a method for automatically controlling gas utilization, which is applied to a gas utilization automatic control system, wherein the gas utilization automatic control system includes a controller and a coke oven gas control system and a blast furnace gas control system respectively connected to the controller, and the method includes:

[0039] The controller obtains the gas heat required by the target link;

[0040] The coke oven gas control system detects the flow rate of the coke oven gas, sends the flow rate of the coke oven gas to the controller, and pressurizes the coke oven gas;

[0041] The controller calculates the required flow rate of blast furnace gas by performing calorific value matching according to the heat of the coke oven gas and the required heat of the gas;

[0042] The controller controls the blast furnace gas control system based on the required flow rate of the blast furnace gas, so that the actual flow rate of the blast furnace gas is consistent with the required flow rate of the blast furnace gas.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The present invention provides an automatic control system and method for gas utilization, wherein a controller can obtain the gas heat required for a target link, obtain the flow of coke oven gas detected by a coke oven gas control system, and pressurize the coke oven gas based on the coke oven gas control system. The required flow of blast furnace gas is obtained by calculating the calorific value ratio according to the heat of the coke oven gas and the required heat of the gas. The blast furnace gas control system is controlled based on the required flow of blast furnace gas so that the actual flow of blast furnace gas is consistent with the required flow. In this solution, the coke oven gas is first pressurized and then mixed with the blast furnace gas after flow adjustment, so that the required heat demand can be met, abnormal production rhythm can be avoided, and product quality can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 One of the logical structure diagrams of the automatic control system for gas utilization provided by the embodiment of the present invention;

[0047] Figure 2 The adjustment parameters of the pressure adjustment model provided in the embodiment of the present invention;

[0048] Figure 3 The adjustment parameters of the flow regulation model provided in the embodiment of the present invention;

[0049] Figure 4 The second logical structure diagram of the automatic control system for gas utilization provided by the embodiment of the present invention;

[0050] Figure 5 The present invention provides a flowchart of a method for automatically controlling gas utilization.

[0051] icon: DETAILED DESCRIPTION

[0052] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the present invention, it should be noted that if the terms "front", "rear", "inside", "outside", etc. appear to indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0056] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0057] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0058] See also Figure 1, is a structural block diagram of a gas utilization automatic control system provided in an embodiment of the present invention, the gas utilization automatic control system includes a controller and a coke oven gas control system and a blast furnace gas control system respectively connected to the controller. The coke oven gas control system includes a coke oven gas pipeline and some components arranged in the coke oven gas pipeline, such as a flow meter, a flow regulating valve, a pressure detector, etc. The blast furnace gas control system includes a blast furnace gas pipeline and some components arranged in the blast furnace gas pipeline, similarly including a flow meter, a flow regulating valve, a pressure detector, etc.

[0059] The controller can communicate with the coke oven gas control system and the blast furnace gas control system to realize the transmission of data, instructions, etc. For example, the controller can obtain data detected by the coke oven gas control system and the blast furnace gas control system, and can also send relevant control instructions to the coke oven gas control system and the blast furnace gas control system.

[0060] In the gas utilization automatic control system provided in this embodiment, the controller is mainly used to realize the following functions:

[0061] Obtain the gas heat required for the target link;

[0062] Obtaining the flow rate of coke oven gas detected by the coke oven gas control system, and pressurizing the coke oven gas based on the coke oven gas control system;

[0063] The required flow rate of blast furnace gas is obtained by calculating the calorific value ratio according to the heat of the coke oven gas and the required heat of the gas;

[0064] The blast furnace gas control system is controlled based on the required flow rate of the blast furnace gas so that the actual flow rate of the blast furnace gas is consistent with the required flow rate of the blast furnace gas.

[0065] In this embodiment, the target link may refer to any process link in the product process of the user unit, for example, the target link may be a medium plate process link. The staff may input the gas heat required for the target link through an input device, and the input device is connected to the controller, and the input device may transmit the required gas heat to the controller.

[0066] Among them, the coke oven gas in the coke oven pipeline and the blast furnace gas in the blast furnace gas pipeline are mixed to obtain mixed gas, which can jointly provide the required gas heat for the target link. Therefore, it is necessary to control the coke oven gas based on the coke oven gas control system and control the blast furnace gas based on the blast furnace gas control system.

[0067] The coke oven gas control system can detect the flow of coke oven gas. Specifically, the flow of coke oven gas in the coke oven gas pipeline can be detected by a flow detector arranged in the coke oven gas pipeline. The flow detector can send the flow of coke oven gas to the controller.

[0068] In addition, the controller can also pressurize the coke oven gas based on the coke oven gas control system to ensure sufficient and stable subsequent gas supply.

[0069] After obtaining the flow rate of the coke oven gas, the controller calculates the required flow rate of the blast furnace gas by combining the required heat of the gas with the calorific value ratio.

[0070] Specifically, the calculation formula for the calorific value ratio of the mixed gas is as follows:

[0071]

[0072] Among them, Hh represents the calorific value of the mixed gas, that is, the calorific value calculated in real time, Vg represents the calorific value flow rate of coke oven gas, Vd represents the calorific value flow rate of blast furnace gas, Hg represents the calorific value of coke oven gas, and Hd represents the calorific value of blast furnace gas.

[0073] From this, we can get the calculation method of mixed gas calorific value ratio:

[0074]

[0075] Among them, X represents the calorific value ratio coefficient of coke oven gas, Y represents the calorific value ratio coefficient of blast furnace gas, and the total calorific value ratio coefficient can be 10.

[0076] During implementation, the staff can input the relevant ratio coefficient based on the input device, for example, the calorific value ratio coefficient of coke oven gas is 3 (correspondingly, the calorific value ratio coefficient of blast furnace gas is 7). Assume that the target link, such as the middle plate process link, requires a gas heat of 13000 kj / m 3 After the coke oven gas is introduced and the flow rate of the coke oven gas is detected, the required flow rate of the blast furnace gas can be calculated based on the preset calorific value of the coke oven gas and the calorific value of the blast furnace gas.

[0077] In this way, the blast furnace gas control system can be controlled based on the calculated required flow rate of the blast furnace gas, so that the actual flow rate of the blast furnace gas is consistent with the calculated required flow rate of the blast furnace gas. Here, when the difference between the actual flow rate of the blast furnace gas and the required flow rate is within a preset range, it can be determined that the two are consistent.

[0078] The gas utilization automatic control system provided in this embodiment pressurizes the coke oven gas first and then mixes it with the blast furnace gas after flow adjustment, so as to meet the required heat demand, avoid abnormal production rhythm, and thus ensure product quality.

[0079] In this embodiment, a mixing pipeline is connected to both the coke oven gas pipeline and the blast furnace gas pipeline. The mixing pipeline is communicated with the coke oven gas pipeline and the blast furnace gas pipeline respectively.

[0080] When the controller performs pressurization on the coke oven gas pipeline, it can be achieved in the following ways:

[0081] The real-time pressure at the mixing pipe is obtained, and the target pressure is obtained; the pressure in the coke oven gas pipe is adjusted according to the real-time pressure and the target pressure and based on the coke oven gas control system, so that after the pressurized coke oven gas in the coke oven gas pipe and the blast furnace gas in the blast furnace gas pipe enter the mixing pipe and merge, the real-time pressure in the mixing pipe reaches the target pressure.

[0082] In this embodiment, a pressure detector is provided at the mixing pipe, and the real-time pressure in the mixing pipe can be detected based on the pressure detector. In addition, a target pressure can be set based on the overall demand, for example, the target pressure can be input through an input device. If the real-time pressure is far from the target pressure, the real-time pressure needs to be adjusted by pressure regulation. In this embodiment, the pressure of the coke oven gas is adjusted to achieve the purpose of adjusting the pressure of the mixed gas.

[0083] In this embodiment, the coke oven gas control system further includes a pressurizing component disposed in the coke oven gas pipeline, and the coke oven gas can be pressurized by controlling the pressurizing component, so that after the coke oven gas merges with the blast furnace gas in the mixing pipeline, the real-time pressure in the mixing pipeline reaches the target pressure. Here, when the difference between the real-time pressure and the target pressure is within a preset pressure range, it can be determined that the real-time pressure reaches the target pressure.

[0084] During implementation, it is assumed that the heat required for the target link, such as the middle plate process, is 12000 kj / m 3 The target pressure of the mixed gas delivered to the mixing pipeline is 14.5 kPa. During the pressure regulation of the coke oven gas, the flow rate in the coke oven gas pipeline is 14122 Nm 3 / h. According to the calorific value ratio calculation formula, the required flow rate of blast furnace gas can be calculated to be 5752Nm 3 / h. In this way, the flow control valve in the blast furnace gas pipeline can be adjusted so that the actual flow of the blast furnace gas can reach the required flow. Then, the heat generated by the final mixed gas can reach the heat required for production.

[0085] In the solution provided in this embodiment, even when a calorific value instrument is not required for calorific value detection, the effect of outputting the heat required for the production process can be achieved, thereby ensuring the product quality of the production process.

[0086] In this embodiment, the controller can adjust the pressure in the coke oven gas pipeline in the following ways:

[0087] The pressure deviation between the real-time pressure and the target pressure is calculated; a first adjustment amount is obtained according to the pressure deviation, and the pressure in the coke oven gas pipeline is adjusted according to the first adjustment amount and based on the coke oven gas control system.

[0088] In order to achieve accurate and rapid pressure regulation, the pressure deviation between the real-time pressure and the target pressure is calculated, and the first pressure adjustment amount is determined based on the specific situation of the pressure deviation, and the pressure in the coke oven gas pipeline can be adjusted directly based on the first adjustment amount. In this way, the corresponding adjustment amount is determined based on different deviation situations, and the pressure can be accurately and quickly adjusted to the target value.

[0089] In this embodiment, the controller can obtain the first adjustment amount in the following manner:

[0090] When the pressure deviation exceeds a preset range, determine the target pressure setting range to which the pressure deviation belongs within the preset multiple pressure setting ranges; when it is monitored that the real-time pressure is still maintained for more than a first preset time, obtain a first adjustment amount corresponding to the target pressure setting range.

[0091] In this embodiment, if the pressure deviation between the real-time pressure and the target pressure is small, it can be determined that the real-time pressure is basically consistent with the target pressure, which can meet the user's process production requirements, and there is no need to trigger pressure adjustment. Therefore, pressure adjustment is triggered only when the pressure deviation exceeds the preset range, for example, the preset range can be [-0.6kpa, +0.6kpa].

[0092] Multiple pressure setting ranges can be set in advance, for example, ten pressure setting ranges can be set, so that ten disturbance pressure adjustment models can be generated. The multiple pressure setting ranges can be set in order from small to large, and there is no overlapping range between two adjacent pressure setting ranges.

[0093] In addition, considering that sudden changes in pressure values ​​may be detected under some abnormal circumstances, in order to avoid interference with regulation caused by sudden changes in pressure due to abnormal circumstances, the time the pressure is maintained can also be detected, and the maintenance time can be used as one of the bases for triggering regulation.

[0094] In this way, we can get Figure 2The pressure regulation model shown in , includes ten pressure setting ranges, such as 0.6 to 0.8, 0.8 to 1.2, 1.2 to 1.6, etc. Moreover, each pressure setting range has a corresponding duration, such as the first pressure setting range corresponds to a time of 2.0, the second pressure setting range corresponds to a time of 3.0, and the third pressure setting range corresponds to a time of 3.0.

[0095] On this basis, after obtaining the pressure deviation between the real-time pressure and the target pressure, the target pressure setting range to which the pressure deviation belongs can be determined. Assuming that the detected real-time pressure ( Figure 2 The measured value in the test) is 15.22 kPa, and the target pressure ( Figure 2 The set value in ( ) is 14.50kpa, then the pressure deviation between the two is 0.72kpa, and the target pressure setting range to which it belongs is the first pressure setting range, i.e. 0.6 to 0.8. In addition, the duration of the real-time pressure can also be detected. If it exceeds the first preset time length and is still at the real-time pressure, where the first preset time length is 2.0 corresponding to the first pressure setting range. At this time, it can be determined that the pressure adjustment needs to be triggered, and the first adjustment amount corresponding to the target pressure setting range is obtained. Figure 2 As shown in , the first adjustment amount corresponding to the target pressure setting range of 0.6 to 0.8 is 0.5.

[0096] When the deviation between the real-time pressure and the target pressure is large, and the existence time satisfies a certain adjustment model, the adjustment amount set by the current model is given to the regulator for adjustment to continuously eliminate the deviation until it returns to the initial normal range. Each model gives different adjustment amounts to the controller according to the size of the deviation and the length of the existence time. The larger the disturbance amount and the longer the existence time, the larger the controller adjustment amount, the smaller the corresponding disturbance amount, the shorter the existence time, and the smaller the corresponding control model adjustment amount, the finer the adjustment, so that the disturbance coarse adjustment is achieved, the faster the reaction, and the small disturbance fine adjustment is achieved, the slower the reaction. It can quickly reach the set range.

[0097] In this way, the pressure of the coke oven gas pipeline can be adjusted based on the obtained first adjustment amount, thereby achieving the purpose of pressure regulation accurately and quickly.

[0098] In this embodiment, the coke oven gas pipeline may include multiple flow regulating valves, for example, including coke 1 and coke 2 (representing regulating valves respectively). When the flow of coke oven gas is controlled, it can be controlled by either coke 1 or coke 2. When coke 1 is used for control, coke 2 is in the maximum opening state. When coke 2 is used for control, coke 1 is in the maximum opening state.

[0099] In addition, the blast furnace gas pipeline also includes multiple flow control valves. For example, including High 1 and High 2 (representing control valves respectively), in the flow control of blast furnace gas, it can be adjusted by either High 1 or High 2. When using High 1 for adjustment, High 2 is in the maximum opening state. When using High 2 for adjustment, High 1 is in the maximum opening state.

[0100] The controller controls the blast furnace gas control system and adjusts the flow of blast furnace gas in the following ways:

[0101] The flow difference between the required flow rate of the blast furnace gas and the actual flow rate is calculated; a second adjustment amount is obtained based on the flow difference, and the flow control valve is adjusted based on the second adjustment amount.

[0102] Similarly, in order to accurately and quickly adjust the flow rate of blast furnace gas, the flow rate difference between the required flow rate and the actual flow rate of blast furnace gas can be calculated, and then the corresponding second adjustment amount can be determined based on the flow rate difference.

[0103] In this way, different flow adjustment amounts can be adaptively used for adjustment when the flow difference between the required flow and the actual flow is different.

[0104] In this embodiment, the controller can be used to obtain the second adjustment amount in the following manner:

[0105] Determine the target flow setting range to which the flow difference belongs within the preset multiple flow setting ranges; when monitoring that the actual flow is still within the actual flow for more than a second preset time, obtain a second adjustment amount corresponding to the target flow setting range.

[0106] In this embodiment, similarly, flow regulation is triggered only when the flow difference exceeds a certain flow range. For example, when the flow difference exceeds [-500m 3 / h,+500m 3 / h] to trigger flow regulation.

[0107] There are multiple flow setting ranges pre-set, such as Figure 3 In the ten-stage flow adjustment model shown in , the flow setting range of the first stage is 500 to 700, the flow setting range of the second stage is 700 to 1000, and the flow setting range of the third stage is 1000 to 1500.

[0108] The adjustment reference value of each flow setting range can be based on the data shown in Table 1. For example, the required flow rate of blast furnace gas is 10000m 3 / h, the minimum opening of the flow control valve is set at 40%. Then the second adjustment amount is accumulated on this basis.

[0109] Table 1 Correspondence between regulating valve opening, actual flow and flow difference

[0110]

[0111] On this basis, the target flow setting range to which the calculated flow difference belongs within multiple flow setting ranges can be determined. For example, assuming that the required flow rate of blast furnace gas is 19890m 3 / h, the actual flow rate detected is 18656m 3 / h, the flow difference between the two is 1234m 3 / h, which belongs to the flow setting range of 1000 to 1500.

[0112] In addition, considering that the system may experience abnormal fluctuations, resulting in sudden changes in the detected flow, the duration of the detected actual flow can also be used as a basis for adjustment. That is, when the actual flow is monitored to last for more than the second preset time, the flow adjustment is triggered.

[0113] The second preset time lengths set for each flow setting range are also different, for example Figure 3 As shown in , the second preset duration corresponding to the range of 500 to 700 is 4.0, and the second preset duration corresponding to the range of 1000 to 1500 is 5.0.

[0114] Based on this, when it is monitored that the actual flow rate lasts for more than the second preset time length, the second adjustment amount corresponding to the target flow setting range is determined, wherein the determined second adjustment amount can be the flow value. When the flow control valve is actually adjusted, the required flow value must be converted into the adjustment opening of the flow control valve.

[0115] Specifically, in this embodiment, the controller can adjust the flow control valve based on the second adjustment amount in the following manner:

[0116] Based on the maximum opening and minimum opening of the flow regulating valve, as well as the maximum flow value corresponding to the maximum opening and the minimum flow value corresponding to the minimum opening; based on the maximum opening, the minimum opening, the maximum flow value and the minimum flow value, the unit flow value corresponding to the unit opening of the flow regulating valve is calculated; and the flow regulating valve is adjusted according to the unit flow value and the second adjustment amount.

[0117] In this embodiment, it is necessary to calculate the flow rate corresponding to a unit opening of the flow control valve. Assume that the maximum opening of the flow control valve is 100% and the minimum opening is 0%. The maximum flow value corresponding to the maximum opening is assumed to be A, and the minimum flow value corresponding to the minimum opening is assumed to be B. Assume that the opening of 1% is taken as the unit opening. Then the unit flow value corresponding to the unit opening is (AB) / 100. That is, it can be calculated how much flow change will correspond to each change of one unit opening of the flow control valve.

[0118] On this basis, the flow control valve can be adjusted based on the unit flow value and the second adjustment amount. Specifically, the controller can achieve the adjustment in the following ways:

[0119] Calculate the multiple of the second adjustment amount relative to the unit flow value; calculate the adjustment opening according to the multiple and the unit opening; and adjust the flow control valve based on the current opening of the flow control valve based on the adjustment opening.

[0120] In this embodiment, assuming that the second adjustment amount is P, and the unit flow value corresponding to the unit opening of the flow control valve is a, the second adjustment amount is P / a times the unit flow value. In other words, when the flow control valve needs to be changed by P / a times, the flow change second adjustment amount can be P. Based on this, the flow control valve opening can be adjusted based on the calculated adjustment opening (P / a) on the basis of the opening of the flow control valve.

[0121] Through the above method, the actual flow rate of blast furnace gas can reach the required flow rate.

[0122] In the implementation process, it is considered that the coke oven gas and blast furnace gas in a single coke oven gas pipeline and a single blast furnace gas pipeline cannot provide the required heat. Therefore, in this embodiment, the coke oven gas pipeline includes a first coke oven gas pipeline and a second coke oven gas pipeline, and the cross-sectional cotton knot of the first coke oven gas pipeline is larger than the cross-sectional area of ​​the second coke oven gas pipeline. The blast furnace gas pipeline includes a first blast furnace gas pipeline and a second blast furnace gas pipeline, and the cross-sectional area of ​​the first blast furnace gas pipeline is larger than the cross-sectional area of ​​the second blast furnace gas pipeline.

[0123] In this way, a second coke oven gas pipeline and a second blast furnace gas pipeline with smaller cross-sectional areas can be added on the basis of the original first coke oven gas pipeline and the first blast furnace gas pipeline with larger cross-sectional areas, thereby supplementing the flow.

[0124] On this basis, the controller is used to adjust the pressure of the coke oven gas in the first coke oven gas pipeline based on the coke oven gas control system, and to adjust the flow of the blast furnace gas in the second blast furnace gas pipeline based on the blast furnace gas control system.

[0125] In this way, the pressure of the coke oven gas in the first coke oven gas pipeline of the large pipe can be adjusted, and the flow rate of the coke oven gas in the second coke oven gas pipeline of the small pipe can be controlled. In addition, the pressure of the blast furnace gas in the blast furnace gas pipeline of the large pipe can be controlled, and the flow rate of the blast furnace gas in the blast furnace gas pipeline of the small pipe can be adjusted.

[0126] Please refer to Figure 4 , is a schematic diagram of the overall regulation of coke oven gas and blast furnace gas in this embodiment, wherein the coke oven gas (referred to as coke gas) in the coke oven gas pipeline and the blast furnace gas (referred to as blast furnace gas) in the blast furnace gas pipeline enter the mixing pipeline and merge into a mixed gas. The real-time pressure in the mixing pipeline is compared with the target pressure, and if the pressure difference between the real-time pressure and the target pressure exceeds a certain preset range, the pressure regulation is triggered. This pressure regulation is for the pressure regulation of the coke oven gas in the coke oven gas pipeline. By adjusting the pressure of the coke oven gas, the real-time pressure at the final mixing pipeline can reach the target pressure.

[0127] In addition, the flow rate of coke oven gas is detected, and based on the flow rate of coke oven gas and the required heat of the target link, the required flow rate of blast furnace gas is calculated through calorific value ratio. Based on the actual flow rate of blast furnace gas detected, the required flow rate is compared with the actual flow rate, and the flow adjustment is triggered when the flow difference between the required flow rate and the actual flow rate exceeds a certain preset range.

[0128] When regulating the blast furnace gas, the adjustment opening of the flow control valve is obtained based on the constructed ten-stage adjustment model, and the flow control valve is adjusted based on the adjustment opening, so that the actual flow of the blast furnace gas can reach the required flow. At this point, the automatic adjustment process of gas utilization is completed.

[0129] Through the automatic control of gas utilization, the gas pressure required by the production unit can be quickly met, and the fluctuation of gas pressure in the pipeline caused by production can be quickly eliminated. The automatic control system can quickly meet the heat required by the production unit, meet the calorific value required by the user's production, and quickly adjust the ratio control of large and small flow rates. In this way, manual repetitive operations can be reduced and the needs of production processes can be met.

[0130] In this embodiment, the given calorific value of the coke oven gas and the given calorific value of the blast furnace gas are, for example, 17250 kj / m 3 and 3600 kj / m 3 On a stable basis, based on the calculation of calorific value ratio, the actual heat obtained is compared with the required heat, and the difference between the two does not exceed 300kj / m 3, indicating that the actual heat generated is basically consistent with the required heat. It also proves that this solution can be applied in the application scenario without a calorimeter.

[0131] See also Figure 5 The embodiment of the present invention further provides a method for automatically controlling gas utilization, which can be applied to the above-mentioned automatic control system for gas utilization. The method for automatically controlling gas utilization may include the following steps:

[0132] S11, the controller obtains the gas heat required by the target link;

[0133] S12, the coke oven gas control system detects the flow rate of the coke oven gas, sends the flow rate of the coke oven gas to the controller, and pressurizes the coke oven gas;

[0134] S13, the controller calculates the required flow rate of blast furnace gas by performing calorific value matching according to the heat of the coke oven gas and the required heat of the gas;

[0135] S14, the controller controls the blast furnace gas control system based on the required flow rate of the blast furnace gas, so that the actual flow rate of the blast furnace gas is consistent with the required flow rate of the blast furnace gas.

[0136] The gas utilization automatic control method provided in this embodiment pressurizes the coke oven gas first and then mixes it with the blast furnace gas after flow adjustment, so as to meet the required heat demand, avoid abnormal production rhythm, and ensure product quality.

[0137] In a possible implementation, the coke oven gas control system includes a coke oven gas pipeline, the blast furnace gas control system includes a blast furnace gas pipeline, the gas utilization automatic control system also includes a mixing pipeline connected to the coke oven gas pipeline and the blast furnace gas pipeline respectively, and the step of the controller pressurizing the coke oven gas can be implemented in the following manner:

[0138] Obtaining the real-time pressure at the mixing pipeline and obtaining the target pressure;

[0139] The pressure in the coke oven gas pipeline is adjusted according to the real-time pressure and the target pressure and based on the coke oven gas control system, so that after the pressurized coke oven gas in the coke oven gas pipeline and the blast furnace gas in the blast furnace gas pipeline enter the mixing pipeline and merge, the real-time pressure in the mixing pipeline reaches the target pressure.

[0140] In a possible implementation, the step of the controller adjusting the pressure in the coke oven gas pipeline based on the coke oven gas control system can be implemented in the following manner:

[0141] Calculating a pressure deviation between the real-time pressure and the target pressure;

[0142] A first adjustment amount is obtained according to the pressure deviation, and the pressure in the coke oven gas pipeline is adjusted according to the first adjustment amount and based on the coke oven gas control system.

[0143] In a possible implementation manner, the step of obtaining the first adjustment amount may be implemented in the following manner:

[0144] When the pressure deviation exceeds a preset range, determining a target pressure setting range to which the pressure deviation belongs within a plurality of preset pressure setting ranges;

[0145] When it is monitored that the pressure remains at the real-time pressure for more than the first preset time, a first adjustment amount corresponding to the target pressure setting range is obtained.

[0146] In a possible implementation, the blast furnace gas control system further includes a flow regulating valve disposed in the blast furnace gas pipeline; the step of the controller controlling the blast furnace gas control system can be implemented in the following manner:

[0147] Calculating the flow difference between the required flow rate of the blast furnace gas and the actual flow rate;

[0148] A second adjustment amount is obtained based on the flow difference, and the flow control valve is adjusted based on the second adjustment amount.

[0149] In a possible implementation manner, the step of obtaining the second adjustment amount may be implemented in the following manner:

[0150] Determine a target flow setting range to which the flow difference belongs within a plurality of preset flow setting ranges;

[0151] When it is monitored that the actual flow rate is still maintained for more than the second preset time, a second adjustment amount corresponding to the target flow rate setting range is obtained.

[0152] In a possible implementation, the step of adjusting the flow control valve based on the second adjustment amount may be implemented in the following manner:

[0153] Based on the maximum opening and minimum opening of the flow control valve, as well as the maximum flow value corresponding to the maximum opening and the minimum flow value corresponding to the minimum opening;

[0154] The unit flow value corresponding to the unit opening of the flow control valve is calculated based on the maximum opening, the minimum opening, the maximum flow value and the minimum flow value;

[0155] The flow regulating valve is adjusted according to the unit flow value and the second adjustment amount.

[0156] In a possible implementation, the step of adjusting the flow control valve according to the unit flow value and the second adjustment amount can be implemented in the following manner:

[0157] Calculating a multiple of the second adjustment amount relative to the unit flow value;

[0158] The adjustment opening is calculated according to the multiple and the unit opening;

[0159] Based on the adjustment opening, the adjustment is performed on the basis of the current opening of the flow control valve.

[0160] The automatic gas utilization control method provided in this embodiment can realize the relevant functions of the automatic gas utilization control system in any one of the implementation modes in the above embodiments. The technical effect of the automatic gas utilization control method in this embodiment can refer to the technical effect of the automatic gas utilization control system in any one of the implementation modes in the above embodiments, which will not be repeated here.

[0161] In summary, the gas utilization automatic control system and method provided by the embodiment of the present invention, the controller can obtain the gas heat required for the target link, obtain the flow of coke oven gas detected by the coke oven gas control system, and pressurize the coke oven gas based on the coke oven gas control system. The required flow of blast furnace gas is obtained by calculating the calorific value ratio according to the heat of the coke oven gas and the required gas heat. The blast furnace gas control system is controlled based on the required flow of blast furnace gas so that the actual flow of blast furnace gas is consistent with the required flow. In this solution, the coke oven gas is first pressurized and then mixed with the blast furnace gas after flow adjustment, so as to meet the required heat demand, avoid abnormal production rhythm, and ensure product quality.

[0162] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A gas utilization automatic control system, characterized in that: The gas utilization automatic control system comprises a controller and a coke oven gas control system and a blast furnace gas control system respectively connected to the controller, wherein the controller is used for: Obtain the gas heat required for the target link; Obtaining the flow rate of coke oven gas detected by the coke oven gas control system, and pressurizing the coke oven gas based on the coke oven gas control system; The required flow rate of blast furnace gas is obtained by calculating the calorific value ratio according to the heat of the coke oven gas and the required heat of the gas; The blast furnace gas control system is controlled based on the required flow rate of the blast furnace gas so that the actual flow rate of the blast furnace gas is consistent with the required flow rate of the blast furnace gas.

2. The automatic gas utilization control system according to claim 1, characterized in that: The coke oven gas control system includes a coke oven gas pipeline, the blast furnace gas control system includes a blast furnace gas pipeline, and the gas utilization automatic control system also includes a mixing pipeline connected to the coke oven gas pipeline and the blast furnace gas pipeline respectively; The controller is used to pressurize the coke oven gas in the following manner: Obtaining the real-time pressure at the mixing pipeline and obtaining the target pressure; The pressure in the coke oven gas pipeline is adjusted according to the real-time pressure and the target pressure and based on the coke oven gas control system, so that after the pressurized coke oven gas in the coke oven gas pipeline and the blast furnace gas in the blast furnace gas pipeline enter the mixing pipeline and merge, the real-time pressure in the mixing pipeline reaches the target pressure.

3. The automatic gas utilization control system according to claim 2, characterized in that: The controller is used to adjust the pressure in the coke oven gas pipeline based on the coke oven gas control system in the following manner: Calculating a pressure deviation between the real-time pressure and the target pressure; A first adjustment amount is obtained according to the pressure deviation, and the pressure in the coke oven gas pipeline is adjusted according to the first adjustment amount and based on the coke oven gas control system.

4. The automatic gas utilization control system according to claim 3, characterized in that: The controller is used to obtain the first adjustment amount in the following manner: When the pressure deviation exceeds a preset range, determining a target pressure setting range to which the pressure deviation belongs within a plurality of preset pressure setting ranges; When it is monitored that the pressure remains at the real-time pressure for more than the first preset time, a first adjustment amount corresponding to the target pressure setting range is obtained.

5. The automatic gas utilization control system according to claim 2, characterized in that: The blast furnace gas control system further includes a flow regulating valve disposed in the blast furnace gas pipeline; The controller is used to control the blast furnace gas control system in the following manner: Calculating the flow difference between the required flow rate of the blast furnace gas and the actual flow rate; A second adjustment amount is obtained based on the flow difference, and the flow control valve is adjusted based on the second adjustment amount.

6. The automatic gas utilization control system according to claim 5, characterized in that: The controller is used to obtain the second adjustment amount by: Determine a target flow setting range to which the flow difference belongs within a plurality of preset flow setting ranges; When it is monitored that the actual flow rate is still maintained for more than the second preset time, a second adjustment amount corresponding to the target flow rate setting range is obtained.

7. The automatic gas utilization control system according to claim 5, characterized in that: The controller is used to adjust the flow control valve based on the second adjustment amount in the following manner: Based on the maximum opening and minimum opening of the flow control valve, as well as the maximum flow value corresponding to the maximum opening and the minimum flow value corresponding to the minimum opening; The unit flow value corresponding to the unit opening of the flow control valve is calculated based on the maximum opening, the minimum opening, the maximum flow value and the minimum flow value; The flow regulating valve is adjusted according to the unit flow value and the second adjustment amount.

8. The automatic gas utilization control system according to claim 7, characterized in that: The controller is used to adjust the flow regulating valve according to the unit flow value and the second adjustment amount in the following manner: Calculating a multiple of the second adjustment amount relative to the unit flow value; The adjustment opening is calculated according to the multiple and the unit opening; Based on the adjustment opening, the adjustment is performed on the basis of the current opening of the flow control valve.

9. The automatic gas utilization control system according to claim 2, characterized in that: The coke oven gas pipeline comprises a first coke oven gas pipeline and a second coke oven gas pipeline, wherein the cross-sectional area of ​​the first coke oven gas pipeline is greater than the cross-sectional area of ​​the second coke oven gas pipeline; The blast furnace gas pipeline comprises a first blast furnace gas pipeline and a second blast furnace gas pipeline, and the cross-sectional area of ​​the first blast furnace gas pipeline is greater than the cross-sectional area of ​​the second blast furnace gas pipeline; The controller is used to adjust the pressure of the coke oven gas in the first coke oven gas pipeline based on the coke oven gas control system, and to adjust the flow rate of the blast furnace gas in the second blast furnace gas pipeline based on the blast furnace gas control system.

10. A method for automatic control of gas utilization, characterized in that: Applied to a gas utilization automatic control system, the gas utilization automatic control system includes a controller and a coke oven gas control system and a blast furnace gas control system respectively connected to the controller, the method includes: The controller obtains the gas heat required by the target link; The coke oven gas control system detects the flow rate of the coke oven gas, sends the flow rate of the coke oven gas to the controller, and pressurizes the coke oven gas; The controller calculates the required flow rate of blast furnace gas by performing calorific value matching according to the heat of the coke oven gas and the required heat of the gas; The controller controls the blast furnace gas control system based on the required flow rate of the blast furnace gas, so that the actual flow rate of the blast furnace gas is consistent with the required flow rate of the blast furnace gas.

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