Boiler system, power generation equipment and control method thereof

Abstract

The invention discloses a boiler system, power generation equipment and a control method of the power generation equipment. An outlet of the mixed gas pipeline is connected with a first inlet of the boiler body, and the mixed gas pipeline is provided with a first valve, a first flow meter and a first calorific value instrument; an outlet of the blast furnace gas pipeline is connected with an inlet of the mixed gas pipeline; an outlet of the converter gas pipeline is connected with an inlet of the mixed gas pipeline, and a second valve is arranged on the converter gas pipeline; the controller is used for acquiring the required heat of the boiler body in unit time; and based on the required heat, the current detection flow of the first flowmeter and the current detection heat value of the first heat value instrument, the opening degree of the first valve and / or the second valve is adjusted, so that the actual heat provided by the coal gas in unit time of the boiler body reaches the required heat. The technical problem that the adjustment precision of the gas inlet amount of the coal gas in the boiler is low is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of boilers, and particularly relates to a boiler system, a power generation device and a control method thereof. BACKGROUND

[0002] A large amount of secondary energy is generated in the main process production of a steel plant, including blast furnace gas, converter gas, coke oven gas and the like. The gas is widely used in various production lines, and finally the surplus gas is consumed by a boiler. However, the mixed gas entering the boiler has dynamic changes, such as changes in the proportions of different gases and changes in the calorific value of the mixed gas, which makes the actual heat provided by the gas in a unit time not necessarily reach the required heat. Therefore, it is necessary to dynamically adjust the gas inlet quantity in the boiler. In the existing process, the adjustment mainly relies on manual experience, and the adjustment precision is not enough. The actual heat provided by the gas in a unit time cannot reach the required heat, which easily causes fluctuations in the parameters of the boiler and increases the risk of the system. Therefore, the low adjustment precision of the gas inlet quantity in the boiler is a technical problem to be solved. SUMMARY

[0003] The embodiments of the present application provide a boiler system, a power generation device and a control method thereof, which solve the technical problem of low adjustment precision of the gas inlet quantity in the boiler.

[0004] In a first aspect, the embodiments of the present application provide a boiler system, comprising: a boiler body; a mixed gas pipeline, an outlet of the mixed gas pipeline being connected with a first inlet of the boiler body, a first valve, a first flow meter and a first calorific value instrument being arranged on the mixed gas pipeline, and the first valve being close to the outlet of the mixed gas pipeline, the first flow meter and the first calorific value instrument being close to an inlet of the mixed gas pipeline; a blast furnace gas pipeline, an outlet of the blast furnace gas pipeline being connected with the inlet of the mixed gas pipeline; a converter gas pipeline, an outlet of the converter gas pipeline being connected with the inlet of the mixed gas pipeline, a second valve being arranged on the converter gas pipeline; a controller, being electrically connected with the first valve, the first flow meter, the first calorific value instrument and the second valve, and the controller being configured to: acquire a required heat of the boiler body in a unit time; based on the required heat, a current detected flow of the first flow meter and a current detected calorific value of the first calorific value instrument, adjust an opening degree of the first valve and / or the second valve, so that the actual heat provided by the gas in a unit time of the boiler body reaches the required heat.

[0005] In some embodiments of the first aspect of the present application, the first valve comprises a first sub-valve and a second sub-valve, the first inlet of the boiler body comprises a first sub-inlet and a second sub-inlet; the mixed gas pipeline comprises: a first mixed sub-pipeline, an inlet of the first mixed sub-pipeline is connected with an outlet of the blast furnace gas pipeline and an outlet of the converter gas pipeline, the first mixed sub-pipeline is provided with the first flow meter and the first calorific value instrument; a second mixed sub-pipeline, an inlet of the second mixed sub-pipeline is connected with an outlet of the first mixed sub-pipeline; a third mixed sub-pipeline, an inlet of the third mixed sub-pipeline is connected with a first outlet of the second mixed sub-pipeline, an outlet of the third mixed sub-pipeline is connected with the first sub-inlet of the boiler body, the third mixed sub-pipeline is provided with the first sub-valve; a fourth mixed sub-pipeline, an inlet of the fourth mixed sub-pipeline is connected with a second outlet of the second mixed sub-pipeline, an outlet of the fourth mixed sub-pipeline is connected with the second sub-inlet of the boiler body, the fourth mixed sub-pipeline is provided with the second sub-valve.

[0006] In some embodiments of the first aspect of the present application, the number of the first sub-valve, the second sub-valve, the first sub-inlet, the second sub-inlet, the second mixed sub-pipeline, the third mixed sub-pipeline and the fourth mixed sub-pipeline is 2.

[0007] In some embodiments of the first aspect of the present application, the application further comprises: a coke oven gas pipeline, an outlet of the coke oven gas pipeline is connected with the second inlet of the boiler body, the coke oven gas pipeline is provided with a third valve, a second flow meter and a second calorific value instrument, wherein the third valve is close to the outlet of the coke oven gas pipeline, the second flow meter and the second calorific value instrument are close to the inlet of the coke oven gas pipeline.

[0008] In some embodiments of the first aspect of the present application, the controller is further configured to: if the converter gas adjustment signal is monitored, acquire a first target flow of the converter gas in the converter gas pipeline; based on the required heat, the first target flow, a current detected flow of the first flow meter, a current detected calorific value of the first calorific value instrument, a current detected flow of the second flow meter and a current detected calorific value of the second calorific value instrument, adjust the opening degree of the first sub-valve, the second sub-valve and the second valve, so that the actual heat provided by the gas in the unit time of the boiler body reaches the required heat.

[0009] In some embodiments of the first aspect, the controller is further configured to: determine a first target opening degree based on the first target flow rate; control the opening degree of the second valve to adjust to the first target opening degree at a preset rate; during the adjustment to the first target opening degree, determine a first actual heat provided by the coal gas to the boiler body per unit time based on the current detected flow rate of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow rate of the second flow meter, and the current detected heat value of the second heat value meter; and adjust the opening degrees of the first sub-valve and the second sub-valve based on the first actual heat and the required heat.

[0010] In some embodiments of the first aspect, the controller is further configured to: if a coke oven gas adjustment signal is monitored, obtain a second target flow rate of the coke oven gas in the coke oven gas pipeline; and adjust the opening degrees of the first sub-valve, the second sub-valve, and the third valve based on the required heat, the second target flow rate, the current detected flow rate of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow rate of the second flow meter, and the current detected heat value of the second heat value meter, so that the actual heat provided by the coal gas to the boiler body per unit time reaches the required heat.

[0011] In some embodiments of the first aspect, the controller is further configured to: determine a second target opening degree based on the second target flow rate; control the opening degree of the third valve to adjust to the second target opening degree at a preset rate; during the adjustment to the second target opening degree, determine a second actual heat provided by the coal gas to the boiler body per unit time based on the current detected flow rate of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow rate of the second flow meter, and the current detected heat value of the second heat value meter; and adjust the opening degrees of the first sub-valve and the second sub-valve based on the second actual heat and the required heat.

[0012] In the second aspect, an embodiment of the present application provides a power generation device, which comprises the boiler system of any one of the first aspect.

[0013] In the third aspect, an embodiment of the present application provides a control method of a boiler system, which is applied to the boiler system of any one of the first aspect or the power generation device of the second aspect, and the method comprises: obtaining a required heat of the boiler body per unit time; adjusting the opening degree of the first valve and / or the second valve based on the required heat, the current detected flow rate of the first flow meter, and the current detected heat value of the first heat value meter, so that the actual heat provided by the coal gas to the boiler body per unit time reaches the required heat.

[0014] The one or more technical solutions provided in the embodiments of the present invention achieve at least the following technical effects or advantages: This invention provides a boiler system comprising: a boiler body; a mixed gas pipeline, the outlet of which is connected to a first inlet of the boiler body, the mixed gas pipeline being equipped with a first valve, a first flow meter, and a first calorific value meter, with the first valve near the outlet of the mixed gas pipeline and the first flow meter and first calorific value meter near the inlet of the mixed gas pipeline; a blast furnace gas pipeline, the outlet of which is connected to the inlet of the mixed gas pipeline; a converter gas pipeline, the outlet of which is connected to the inlet of the mixed gas pipeline, the converter gas pipeline being equipped with a second valve; and a controller electrically connected to the first valve, the first flow meter, the first calorific value meter, and the second valve, the controller being configured to: acquire the required heat of the boiler body per unit time; and adjust the opening of the first valve and / or the second valve based on the required heat, the current detected flow rate of the first flow meter, and the current detected calorific value of the first calorific value meter, so that the actual heat provided by the gas in the boiler body per unit time reaches the required heat. Based on the current flow rate detected by the first flow meter and the current calorific value detected by the first calorific value meter, the actual heat provided by the gas in the mixed gas pipeline to the boiler body per unit time can be determined. By comparing the actual heat with the required heat, the valves can be adjusted according to the heat deviation, thus enabling accurate adjustment of the opening of the first valve and / or the second valve. This ensures that the actual heat provided by the gas to the boiler body per unit time reaches the required heat. Therefore, the accuracy of adjusting the gas intake volume in the boiler is improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first schematic diagram of a boiler system in an embodiment of the present invention; Figure 2 This is a second schematic diagram of the boiler system in an embodiment of the present invention; Figure 3 This is a third schematic diagram of the boiler system in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0019] Figure 1 This is a first schematic diagram of a boiler system according to an embodiment of the present invention. (Reference) Figure 1 As shown, an embodiment of the present invention provides a boiler system comprising: a boiler body 10; a mixed gas pipeline 20, the outlet of which is connected to a first inlet of the boiler body 10, the mixed gas pipeline 20 being equipped with a first valve 210, a first flow meter 220, and a first calorific value meter 230, with the first valve 210 near the outlet of the mixed gas pipeline 20 and the first flow meter 220 and the first calorific value meter 230 near the inlet of the mixed gas pipeline 20; a blast furnace gas pipeline 30, the outlet of which is connected to the inlet of the mixed gas pipeline 20; and a converter gas pipeline 40, through which converter gas... The outlet of pipe 40 is connected to the inlet of mixed gas pipe 20. A second valve 410 is installed on converter gas pipe 40. A controller is electrically connected to the first valve 210, the first flow meter 220, the first calorific value meter 230, and the second valve 410. The controller is used to: obtain the heat demand of boiler body 10 per unit time; and adjust the opening of the first valve 210 and / or the second valve 410 based on the heat demand, the current detected flow rate of the first flow meter 220, and the current detected calorific value of the first calorific value meter 230, so that the actual heat provided by the gas in boiler body 10 per unit time reaches the heat demand.

[0020] It should be noted that when the actual heat provided by the gas in the boiler body 10 per unit time reaches the required heat, it can mean that the actual heat and the required heat are close in magnitude.

[0021] In some embodiments, the method for obtaining the required heat of the boiler body 10 in unit time can include: obtaining the operating parameters of the boiler body 10; determining the required heat of the boiler body 10 in unit time based on the operating parameters of the boiler body 10; wherein the operating parameters of the boiler body 10 include the unit load, the main steam temperature and the main steam pressure.

[0022] Referring to Figure 2 As shown in the drawings, the first valve 210 includes a first sub-valve 2110 and a second sub-valve 2120, and the first inlet of the boiler body 10 includes a first sub-inlet and a second sub-inlet; the mixed gas pipeline 20 includes: a first mixed sub-pipeline 240, an inlet of the first mixed sub-pipeline 240 being connected with an outlet of the blast furnace gas pipeline 30 and an outlet of the converter gas pipeline 40, the first mixed sub-pipeline 240 being provided with a first flow meter 220 and a first calorific value instrument 230; a second mixed sub-pipeline 250, an inlet of the second mixed sub-pipeline 250 being connected with an outlet of the first mixed sub-pipeline 240; a third mixed sub-pipeline 260, an inlet of the third mixed sub-pipeline 260 being connected with a first outlet of the second mixed sub-pipeline 250, an outlet of the third mixed sub-pipeline 260 being connected with the first sub-inlet of the boiler body 10, the third mixed sub-pipeline 260 being provided with the first sub-valve 2110; a fourth mixed sub-pipeline 270, an inlet of the fourth mixed sub-pipeline 270 being connected with a second outlet of the second mixed sub-pipeline 250, an outlet of the fourth mixed sub-pipeline 270 being connected with the second sub-inlet of the boiler body 10, the fourth mixed sub-pipeline 270 being provided with the second sub-valve 2120.

[0023] It should be noted that the first sub-valve 2110 can be used for adjusting the upper layer flow of the mixed gas, and the second sub-valve 2120 can be used for adjusting the lower layer flow of the mixed gas.

[0024] Referring to Figure 3 As shown in the drawings, the number of the first sub-valve 2110, the second sub-valve 2120, the first sub-inlet, the second sub-inlet, the second mixed sub-pipeline 250, the third mixed sub-pipeline 260 and the fourth mixed sub-pipeline 270 is 2.

[0025] Referring to Figure 3 As shown in the drawings, the boiler system further includes: a coke oven gas pipeline 50, an outlet of the coke oven gas pipeline 50 being connected with the second inlet of the boiler body 10, the coke oven gas pipeline 50 being provided with a third valve 510, a second flow meter 520 and a second calorific value instrument 530, wherein the third valve 510 is close to the outlet of the coke oven gas pipeline 50, and the second flow meter 520 and the second calorific value instrument 530 are close to the inlet of the coke oven gas pipeline 50.

[0026] It should be noted that during the operation of the boiler body 10, adjustment of different gas flow rates will be involved, and adjustment of different gas flow rates will affect the actual heat provided by the gas to the boiler body 10. In order to ensure that the actual heat reaches the required heat, a series of complex adjustments need to be made to the valve. First, the converter gas regulation will be explained: In some embodiments, the controller is further configured to: if the converter gas regulation signal is monitored, obtain a first target flow rate of the converter gas in the converter gas pipeline 40; based on the required heat, the first target flow rate, the current detection flow rate of the first flow meter 220, the current detection heat value of the first heat value instrument 230, the current detection flow rate of the second flow meter 520, and the current detection heat value of the second heat value instrument 530, adjust the opening of the first sub-valve 2110, the second sub-valve 2120 and the second valve 410, so that the actual heat provided by the gas to the boiler body 10 in a unit of time reaches the required heat.

[0027] For the above-mentioned embodiment of monitoring the converter gas regulation signal, the controller is further configured to: determine a first target opening based on the first target flow rate; control the opening of the second valve 410 to adjust to the first target opening at a preset rate; during the adjustment to the first target opening, based on the current detection flow rate of the first flow meter 220, the current detection heat value of the first heat value instrument 230, the current detection flow rate of the second flow meter 520, and the current detection heat value of the second heat value instrument 530, determine the first actual heat provided by the gas to the boiler body 10 in a unit of time; based on the first actual heat and the required heat, adjust the opening of the first sub-valve 2110 and the second sub-valve 2120.

[0028] In some embodiments, based on the current detection flow rate of the first flow meter 220, the current detection heat value of the first heat value instrument 230, the current detection flow rate of the second flow meter 520, and the current detection heat value of the second heat value instrument 530, the first actual heat provided by the gas to the boiler body 10 in a unit of time can be: the product of the current detection flow rate of the first flow meter 220 and the current detection heat value of the first heat value instrument 230 is taken as the first heat provided by the gas in the mixed gas pipeline 20 to the boiler body 10; the product of the current detection flow rate of the second flow meter 520 and the current detection heat value of the second heat value instrument 530 is taken as the second heat provided by the gas in the coke oven gas pipeline 50 to the boiler body 10; the sum of the first heat and the second heat is taken as the first actual heat.

[0029] In some embodiments, based on the first actual heat and the required heat, adjusting the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 can be: taking the difference between the first actual heat and the required heat as a heat deviation; if the heat deviation is within a preset deviation range, maintaining the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 unchanged; if the heat deviation is greater than an upper limit value of the preset deviation range, reducing the opening degrees of the first sub-valve 2110 and the second sub-valve 2120; if the heat deviation is less than a lower limit value of the preset deviation range, increasing the opening degrees of the first sub-valve 2110 and the second sub-valve 2120; wherein the preset deviation range represents that the numerical value of the first actual heat is close to the numerical value of the required heat.

[0030] It should be noted that in the process of adjusting to the first target opening degree, the current detection flow of the first flow meter 220, the current detection heat value of the first calorimeter 230, the current detection flow of the second flow meter 520, and the current detection heat value of the second calorimeter 530 need to be obtained in real time, so that the first actual heat can be determined in real time, and the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 can be adjusted in real time, thereby ensuring the adjustment accuracy of the first sub-valve 2110 and the second sub-valve 2120, and improving the adjustment accuracy of the gas inflow in the boiler. In addition, the embodiment of the present application limits the adjustment of the opening degree of the second valve 410 to the first target opening degree at a preset rate, thereby avoiding the rapid adjustment of the valve and the imbalance of the adjustment speed of the valve, and ensuring that the first sub-valve 2110 and the second sub-valve 2120 can be adjusted in time according to the second valve 410, so that the actual heat provided by the gas in the boiler body 10 in a unit time reaches the required heat, thereby improving the adjustment accuracy of the gas inflow in the boiler.

[0031] The coke oven gas adjustment will be described below: In some embodiments, the controller is further configured to: if the coke oven gas adjustment signal is monitored, obtain a second target flow of the coke oven gas in the coke oven gas pipeline 50; based on the required heat, the second target flow, the current detection flow of the first flow meter 220, the current detection heat value of the first calorimeter 230, the current detection flow of the second flow meter 520, and the current detection heat value of the second calorimeter 530, adjust the opening degrees of the first sub-valve 2110, the second sub-valve 2120, and the third valve 510, so that the actual heat provided by the gas in the boiler body 10 in a unit time reaches the required heat.

[0032] In the above embodiment of monitoring the coke oven gas adjustment signal, the controller is further configured to: determine a second target opening degree based on the second target flow rate; control the opening degree of the third valve 510 to adjust to the second target opening degree at a preset rate; during the adjustment to the second target opening degree, determine a second actual heat provided by the gas to the boiler body 10 per unit time based on the current detected flow rate of the first flow meter 220, the current detected heat value of the first heat value meter 230, the current detected flow rate of the second flow meter 520, and the current detected heat value of the second heat value meter 530; and adjust the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 based on the second actual heat and the required heat.

[0033] In some embodiments, the determination of the second actual heat provided by the gas to the boiler body 10 per unit time based on the current detected flow rate of the first flow meter 220, the current detected heat value of the first heat value meter 230, the current detected flow rate of the second flow meter 520, and the current detected heat value of the second heat value meter 530 can be: taking the product of the current detected flow rate of the first flow meter 220 and the current detected heat value of the first heat value meter 230 as the first heat provided by the gas in the mixed gas pipeline 20 to the boiler body 10; taking the product of the current detected flow rate of the second flow meter 520 and the current detected heat value of the second heat value meter 530 as the second heat provided by the gas in the coke oven gas pipeline 50 to the boiler body 10; and taking the sum of the first heat and the second heat as the second actual heat.

[0034] In some embodiments, the adjustment of the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 based on the second actual heat and the required heat can be: taking the difference between the second actual heat and the required heat as a heat deviation; maintaining the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 unchanged if the heat deviation is within a preset deviation range; reducing the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 if the heat deviation is greater than an upper limit value of the preset deviation range; and increasing the opening degrees of the first sub-valve 2110 and the second sub-valve 2120 if the heat deviation is less than a lower limit value of the preset deviation range; wherein the preset deviation range represents that the numerical values of the second actual heat and the required heat are close.

[0035] It should be noted that in the process of adjusting to the second target opening, the current detection flow of the first flow meter 220, the current detection heat value of the first calorimeter 230, the current detection flow of the second flow meter 520, and the current detection heat value of the second calorimeter 530 need to be obtained in real time, so that the second actual heat can be determined in real time, and the opening of the first sub valve 2110 and the second sub valve 2120 is adjusted in real time, thereby ensuring the adjustment accuracy of the first sub valve 2110 and the second sub valve 2120, and thereby improving the adjustment accuracy of the gas inlet quantity in the boiler. In addition, the embodiment of the present application limits the opening of the third valve 510 to adjust to the second target opening according to the preset rate, which avoids the speed of adjusting the valve too fast and the speed of adjusting the valve being unbalanced, thereby ensuring that the first sub valve 2110 and the second sub valve 2120 can be adjusted in time according to the third valve 510, so that the actual heat provided by the gas in the boiler body 10 in unit time reaches the required heat, thereby improving the adjustment accuracy of the gas inlet quantity in the boiler.

[0036] It should be noted that in manual adjustment, this process requires higher experience and skills of the operator, and the operation is complicated. For example, when the gas pressure fluctuates suddenly or the calorific value changes, the operator needs to quickly identify the problem and manually adjust the valve opening to ensure the stability of the boiler operating parameters. However, since the operator cannot monitor all parameter changes in real time and continuously, and manual adjustment has a certain lag, it may cause the boiler operating condition to fluctuate, and even affect the stability of the steam output. In addition, in the case of specific requirements for the overall proportion of coal gas in coal gas scheduling, the operator also needs to manually adjust the supply amount of different coal gas according to the change of coal gas ratio. This process not only consumes time and effort, but also easily leads to inaccurate adjustment due to the negligence or judgment error of the operator, thereby affecting the operating efficiency and safety of the boiler. Overall, the existing technology relies on manual operation, which has many inconveniences, including complicated operation, response lag, and insufficient adjustment accuracy, which is difficult to meet the requirements of modern industrial production for the efficiency, stability and safety of boiler operation. Specifically, the timeliness of manual adjustment is poor. The existing technology relies on manual operation, and the operator cannot monitor the changes of the boiler operating parameters in real time and continuously. When the gas pressure fluctuates suddenly or the gas calorific value rises, it cannot respond as quickly as an automatic control system. This lag may cause the boiler operating condition to deteriorate, and cause the overall adjustment of the gas medium balance to lag, affecting the stability and efficiency of the system. Then, the accuracy of manual adjustment is insufficient. Since it relies on manual operation, the existing technology cannot accurately adjust the gas supply and air volume according to the change of gas calorific value and the change of coal gas ratio. This inaccurate adjustment may not be able to quickly meet the user's demand, thereby reducing the efficiency of the unit operation, and even may cause safety accidents, threatening the safety of equipment and personnel. Finally, the labor cost is high and the risk of misoperation is large. In the context of reducing staff and increasing efficiency, the existing technology requires a dedicated person to monitor and adjust the boiler, which not only increases the number of post personnel, but also puts higher requirements on the experience and skills of the operator. At the same time, manual operation is prone to misoperation due to fatigue or negligence, increasing the probability of accidents, further affecting the safety and economy of the system. The operation is complicated and inefficient. Manual operation requires the operator to constantly monitor, judge and manually adjust the valve opening, which is complicated and inefficient. Especially in the case of specific requirements for the overall proportion of coal gas in coal gas scheduling, the operator needs to adjust frequently, which not only consumes time and effort, but also is difficult to ensure the accuracy and consistency of the adjustment. Therefore, the present embodiment of the application proposes the above-mentioned automatic control method.

[0037] It should be noted that when the unit load is maintained in a stable state, the blast furnace gas is the basic fuel, there is no separate valve control, only the total amount of gas can be adjusted, and it cannot be cut off alone. The amount of coke oven gas and converter gas can be adjusted from 0 to the maximum design amount. The system can learn and predict the current total fuel demand amount through historical data, and automatically adjust the amount of gas entering the boiler through the change of the actual calorific value, as follows: when adjusting the amount of coke oven gas, the coke oven gas calorific value remains unchanged, the mixed gas calorific value formed by the converter gas and the blast furnace gas remains unchanged, the corresponding valve of the coke oven gas flow control and the corresponding valve of the mixed gas flow control are adjusted, and the corresponding valve of the converter gas flow control remains unchanged. When adjusting the amount of converter gas, the coke oven gas calorific value remains unchanged, the mixed calorific value of converter gas and blast furnace gas changes accordingly, the corresponding valve of the converter gas flow control and the corresponding valve of the mixed gas flow control are adjusted, and the corresponding valve of the coke oven gas flow control remains unchanged. The data learning model can be introduced into the control system in the embodiment of the application, and can be continuously optimized and iterated during operation, can predict the valve opening, increase the feedforward control, and avoid the system parameter oscillation caused by manual feedback control.

[0038] It should be noted that the valve of the embodiment of the application can realize the function of flow control, the controller of the embodiment of the application can be a controller based on a DCS control system, further, the second valve 410 and the third valve 510 can keep the valve position unchanged before and after automatic control, the first sub-valve 2110 and the second sub-valve 2120 can be controlled by the DCS control system after automatic control is put into operation, and keep the final valve position after exiting. Further, when the coke oven gas flow needs to be adjusted, the target value of the coke oven gas flow can be input on the DCS host computer in communication with the DCS control system, the automatic control device for automatic control obtains the signal, and then obtains the real-time flow signal through the DCS control system, so that the third valve 510 is adjusted to the target value at a preset rate. When the real-time flow of the coke oven gas reaches the target value, the position of the third valve 510 remains constant until a new target value is input next time. During the change of the third valve 510, the automatic control device can calculate the predicted position of the first sub-valve 2110 and the second sub-valve 2120 in real time through the prediction model, and transmit the valve position signal to the DCS control system for valve position control. At this time, the position of the second valve 410 remains constant (the flow and calorific value of the mixed gas will change to a certain extent).

[0039] Further, when the converter gas flow needs to be adjusted, the converter gas is mixed with the blast furnace gas in advance and enters the boiler through the same burner by the first sub-valve 2110 and the second sub-valve 2120. When the amount of converter gas changes, the automatic control device calculates the calorific value of the mixed gas and the mixed gas flow to predict the positions of the first sub-valve 2110 and the second sub-valve 2120. In order to reduce iterative calculation, the converter gas usage adjustment adopts a valve position control mode, that is, the target position of the second valve 410 is input on the DCS host computer, and after the automatic control device obtains the signal, the opening of the second valve 410 is controlled at a preset rate through the DCS control system. When the target value is reached, the position of the second valve 410 remains constant until the next new target value is input.

[0040] It should be noted that the coke oven gas flow and the converter gas flow are usually adjusted at different times. Further, when the unit needs to adjust the load, the first sub-valve 2110, the second sub-valve 2120, the second valve 410 and the third valve 510 are taken out of the automatic control, and the load is adjusted manually. After the adjustment is completed, the first sub-valve 2110, the second sub-valve 2120, the second valve 410 and the third valve 510 can be put into automatic control again, and the automatic control device can run again. The automatic control system for adjusting gas of a steel enterprise gas generator unit provided in the embodiment of the application can obtain gas related information through the automatic control device, automatically adjust the gas quantity by combining DCS, improve the operation efficiency, avoid the fluctuation of the power generation load of the unit caused by the adjustment of the gas, and improve the overall power generation efficiency of the unit.

[0041] The boiler system provided by the embodiment of the present application comprises: a boiler body 10; a mixed gas pipeline 20, an outlet of the mixed gas pipeline 20 is connected with a first inlet of the boiler body 10, the mixed gas pipeline 20 is provided with a first valve 210, a first flow meter 220 and a first calorific value instrument 230, the first valve 210 is close to the outlet of the mixed gas pipeline 20, the first flow meter 220 and the first calorific value instrument 230 are close to the inlet of the mixed gas pipeline 20; a blast furnace gas pipeline 30, an outlet of the blast furnace gas pipeline 30 is connected with the inlet of the mixed gas pipeline 20; a converter gas pipeline 40, an outlet of the converter gas pipeline 40 is connected with the inlet of the mixed gas pipeline 20, the converter gas pipeline 40 is provided with a second valve 410; a controller, electrically connected with the first valve 210, the first flow meter 220, the first calorific value instrument 230 and the second valve 410, the controller is used for: acquiring a required heat quantity of the boiler body 10 in a unit time; based on the required heat quantity, a current detected flow of the first flow meter 220 and a current detected calorific value of the first calorific value instrument 230, adjusting the opening degree of the first valve 210 and / or the second valve 410, so that the actual heat quantity provided by the gas to the boiler body 10 in the unit time reaches the required heat quantity. According to the current detected flow of the first flow meter 220 and the current detected calorific value of the first calorific value instrument 230, the actual heat quantity provided by the gas to the boiler body 10 in the unit time in the mixed gas pipeline 20 can be determined, and then by comparing the actual heat quantity with the required heat quantity, the opening degree of the first valve 210 and / or the second valve 410 can be adjusted according to the heat quantity deviation, so that the actual heat quantity provided by the gas to the boiler body 10 in the unit time reaches the required heat quantity. Therefore, the adjustment precision of the gas inlet quantity in the boiler is improved.

[0042] Based on the same inventive concept, the embodiment of the present application provides a power generation equipment, comprising the boiler system of any one of the above-mentioned embodiments.

[0043] It should be understood that more implementation details of the power generation equipment in the embodiment of the present application are described with reference to the foregoing boiler system, and for the sake of brevity of the description, they will not be described here.

[0044] Based on the same inventive concept, the embodiment of the present application provides a control method of a boiler system, applied to a boiler system or a power generation equipment, the method comprising: acquiring a required heat quantity of a boiler body 10 in a unit time; based on the required heat quantity, a current detected flow of a first flow meter 220 and a current detected calorific value of a first calorific value instrument 230, adjusting the opening degree of a first valve 210 and / or a second valve 410, so that the actual heat quantity provided by the gas to the boiler body 10 in the unit time reaches the required heat quantity.

[0045] It should be understood that more implementation details of the control method of the boiler system in the embodiment of the present application are described with reference to the foregoing boiler system, and for the sake of brevity of the description, they will not be described here.

[0046] The above description is merely that of the embodiments of the present application, but is not intended to limit the present application. Since those skilled in the art can come up with various modifications and changes without departing from the spirit and principle of the present application, it should be understood that they should be included within the scope of the claims of the present application.

Claims

1. A boiler system, characterized by The boiler system comprises a boiler body, a mixed gas pipeline, a blast furnace gas pipeline, a converter gas pipeline, and a controller. The outlet of the mixed gas pipeline is connected with the first inlet of the boiler body. The outlet of the blast furnace gas pipeline is connected with the inlet of the mixed gas pipeline. The outlet of the converter gas pipeline is connected with the inlet of the mixed gas pipeline. The controller is electrically connected with the first valve, the first flow meter, the first calorific value instrument, and the second valve. The controller is configured to: acquire the required heat of the boiler body in a unit time; and adjust the opening degree of the first valve and / or the second valve based on the required heat, the current detected flow of the first flow meter, and the current detected calorific value of the first calorific value instrument, so that the actual heat provided by the gas in a unit time reaches the required heat.

2. The boiler system of claim 1, wherein, The first valve comprises a first sub-valve and a second sub-valve. The first inlet of the boiler body comprises a first sub-inlet and a second sub-inlet. The mixed gas pipeline comprises a first mixed sub-pipeline, a second mixed sub-pipeline, a third mixed sub-pipeline, and a fourth mixed sub-pipeline. The inlet of the first mixed sub-pipeline is connected with the outlet of the blast furnace gas pipeline and the outlet of the converter gas pipeline. The inlet of the second mixed sub-pipeline is connected with the outlet of the first mixed sub-pipeline. The inlet of the third mixed sub-pipeline is connected with the first outlet of the second mixed sub-pipeline. The outlet of the third mixed sub-pipeline is connected with the first sub-inlet of the boiler body.

4. A boiler system according to any of claims 2-3, characterized in that, The outlet of the fourth mixed sub-pipeline is connected with the second sub-inlet of the boiler body. The number of the first sub-valve, the second sub-valve, the first sub-inlet, the second sub-inlet, the second mixed sub-pipeline, the third mixed sub-pipeline, and the fourth mixed sub-pipeline is 2.

5. The boiler system of claim 4, wherein, The boiler system further comprises a coke oven gas pipeline. The outlet of the coke oven gas pipeline is connected with the second inlet of the boiler body. The controller is further configured to: acquire the first target flow of the converter gas in the converter gas pipeline if a converter gas adjustment signal is monitored. Adjusting the opening degrees of the first sub-valve, the second sub-valve and the second valve based on the required heat, the first target flow, the current detected flow of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow of the second flow meter and the current detected heat value of the second heat value meter, so that the actual heat provided by the gas to the boiler body in unit time reaches the required heat.

6. The boiler system of claim 5, wherein, The controller is further configured to: determine a first target opening degree based on the first target flow; control the opening degree of the second valve to adjust to the first target opening degree at a preset rate; during the adjustment to the first target opening degree, determine a first actual heat provided by the gas to the boiler body in unit time based on the current detected flow of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow of the second flow meter and the current detected heat value of the second heat value meter; adjust the opening degrees of the first sub-valve and the second sub-valve based on the first actual heat and the required heat.

7. The boiler system of claim 4, wherein, The controller is further configured to: if the coke oven gas adjustment signal is monitored, acquire a second target flow of the coke oven gas in the coke oven gas pipeline; adjust the opening degrees of the first sub-valve, the second sub-valve and the third valve based on the required heat, the second target flow, the current detected flow of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow of the second flow meter and the current detected heat value of the second heat value meter, so that the actual heat provided by the gas to the boiler body in unit time reaches the required heat.

8. The boiler system of claim 7, wherein, The controller is further configured to: determine a second target opening degree based on the second target flow; control the opening degree of the third valve to adjust to the second target opening degree at a preset rate; during the adjustment to the second target opening degree, determine a second actual heat provided by the gas to the boiler body in unit time based on the current detected flow of the first flow meter, the current detected heat value of the first heat value meter, the current detected flow of the second flow meter and the current detected heat value of the second heat value meter; adjust the opening degrees of the first sub-valve and the second sub-valve based on the second actual heat and the required heat.

9. A power generation apparatus characterized by comprising: The boiler system of any one of claims 1-8.

10. A control method of a boiler system, applied to the boiler system according to any one of claims 1 to 8 or the power plant according to claim 9, characterized by, The method comprises: acquiring the required heat of the boiler body in unit time; adjusting the opening degrees of the first valve and / or the second valve based on the required heat, the current detected flow of the first flow meter and the current detected heat value of the first heat value meter, so that the actual heat provided by the gas to the boiler body in unit time reaches the required heat.

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