Blast furnace coal injection optimization control method based on injection speed comparison and blast furnace coal injection system

Abstract

The invention relates to a blast furnace coal injection optimization control method based on injection speed comparison and a blast furnace coal injection system, which are characterized in that based on blast furnace coal injection process requirements, logic design is carried out on remote automatic coal injection control requirements, and the opening degrees of a fluidizing valve and a gulp valve are automatically adjusted, so that the coal injection quantity required by a uniform injection blast furnace is met; the pulverized coal combustion rate and the molten iron quality are improved. A centralized control function picture is developed, a one-key input automation mode is achieved, and meanwhile the actual coal injection amount is monitored in real time. The blast furnace coal injection system is additionally provided with a safety early warning mechanism, alarm reminding is carried out when the air supply flow and the tank pressure exceed an early warning line, and the system safety is greatly improved.

Description

Technical Field

[0001] The invention relates to a blast furnace coal injection optimization control method based on injection speed comparison and a blast furnace coal injection system, belonging to the field of metallurgical automatic control. Background Art

[0002] Blast furnace coal injection is an important part of the current ironmaking production process. Injecting pulverized coal into the blast furnace instead of expensive coke provides heat and reducing agent for the blast furnace smelting process, which can not only reduce the coke ratio, but also save energy costs and coke resources. Blast furnaces have very high requirements for the continuity and stability of the coal injection production process, which requires the coal injection production process to achieve a high level of automated control to eliminate system errors caused by external factors.

[0003] At present, in some operation links of coal injection in blast furnaces, such as the adjustment of coal injection amount and the control of valve opening, operators still need to make judgments and operate based on experience; the different experience and skill levels of different operators may lead to differences in operation results, affecting the stability and accuracy of coal injection. When the working conditions in the blast furnace change, such as changes in parameters such as furnace temperature and furnace pressure, the coal injection system needs to adjust the coal injection amount and injection parameters in time. Manual operation may have a certain lag in response speed and cannot meet the production needs of the blast furnace in time.

[0004] Obviously, the operator relies on experience to manually adjust the tank pressure, fluidizing valve and air supply valve opening to control the coal injection amount, which is labor-intensive and has a low level of automation. In the subsequent technical development, although some automatic control equipment and technology are adopted, in actual application, due to the influence of factors such as equipment accuracy and detection error, the control accuracy still needs to be improved.

[0005] For example, the invention with application number 201510711218.2 provides an automatic control method for the injection amount of the blast furnace coal injection system, including the following steps: Step 1: obtain the precise injection rate; Step 2: use PID adjustment to track and control the injection rate; Step 3: after completing the above-mentioned control of the injection rate process error fluctuation, pay attention to the matters needing attention in the control process in real time, and in each optimal control process, record the status and data of the equipment involved in the control, complete the summary of the optimal data and process, and make corresponding adjustments to the equipment involved in the control and the control parameters to achieve optimal control. However, the above-mentioned application starts automatic adjustment when the speed difference appears in the system, which easily leads to large fluctuations in the instantaneous injection rate, increases the gas consumption, and makes it difficult to achieve uniform coal injection, which seriously affects the coal powder combustion rate and molten iron quality. Summary of the invention

[0006] The present invention provides a blast furnace coal injection optimization control method based on injection speed comparison and a blast furnace coal injection system, which can meet the coal injection amount required for uniform injection of the blast furnace and improve the coal powder combustion rate and molten iron quality.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A blast furnace coal injection optimization control method based on injection velocity comparison specifically comprises the following steps:

[0009] Step S1, preset the injection amount of the coal injection system, defined as m 设 , calculate the set injection speed v 设 ;

[0010] Step S2, collect the real-time injection volume through the weighing sensor installed in the coal injection system, which is defined as m 实 , calculate the real-time blowing speed v 实 ;

[0011] Step S3, if (v 实 -v 设 ) / v 设 >5%, start the air supply valve, the opening increases by 1% every 10 seconds, start the fluidization valve, the opening decreases by 1% every 10 seconds; if 0<<(v 实 -v 设 ) / v 设 <<5%, the opening of the air supply valve and the fluidizing valve remains unchanged; if v 实 <v 设 , start the fluidizing valve, increase the opening by 1% every 10 seconds, and the air supply valve is closed when the air supply flow rate is > 350Nm 3 / h premise, the opening is reduced by 1% every 10s;

[0012] Furthermore, m 设 =n 设 ×M 设 , n 设 To set the coal ratio; M 设 To set the output, the unit is tons, T; m 设 To set the injection volume, the unit is tons, T;

[0013] v 设 =m 设 / t,m 设 is the set injection volume, in tons, T; t is the injection time, in hours, h; v 设 To set the spraying speed, the unit is tons / hour, T / h;

[0014] v 实 =m 实 / t,m 实 is the real-time injection volume, in tons, T; t is the injection time, in hours, h; v 实 is the real-time injection speed, in tons / hour, T / h;

[0015] Furthermore, when the spray tank exceeds the set tank pressure upper limit of 0.02MPa, the fluidizing valve is started, and the opening is reduced by 10% every 10s. At the same time, the air supply valve is started, and the opening is reduced by 5% every 10s, and the opening of the air supply valve is ensured to be greater than or equal to the preset lower limit.

[0016] A blast furnace coal injection system based on injection speed comparison, based on the blast furnace coal injection optimization control method, comprises a charging furnace, a blast furnace, an air tank, a nitrogen tank and a plurality of injection tanks,

[0017] The blast furnace is connected to one end of the spray tank through the first pipeline, the other end of the spray tank is connected to the charging furnace through the second pipeline, one end of the spray tank is connected to one end of the nitrogen tank through the third pipeline, the other end of the spray tank is connected to the other end of the nitrogen tank through the fourth pipeline, the nitrogen tank is connected to the charging furnace through the fifth pipeline at the same time, and the air tank is connected to the first pipeline through the sixth pipeline;

[0018] The first pipeline is equipped with a blowing valve and a coal outlet valve, the second pipeline is equipped with an upper valve and a lower valve, the third pipeline is equipped with a fluidizing valve, the fourth pipeline is equipped with a punching valve, the fifth pipeline is equipped with a powder bin fluidizing valve, and the sixth pipeline is equipped with an air supply valve;

[0019] A pressure boost valve is also installed between the nitrogen tank and the spray tank;

[0020] The other end of the spray tank is also connected to the collector inlet pipe through the seventh pipe, a pressure relief valve is installed on the seventh pipe, and a relief valve is also installed between the spray tank and the collector;

[0021] Furthermore, in the blast furnace coal injection system, two injection tanks, an air tank, a charging furnace, a blast furnace and a nitrogen tank are designed, and all components are displayed on the computer interface in the form of modules.

[0022] Two modules are arranged on one side of the interface. The two modules are arranged in sequence in the vertical direction. One module displays the blast furnace setting value, and the other module displays the blast furnace injection parameters.

[0023] Display the real-time injection speed around the module of the blast furnace and set the injection speed;

[0024] The pulverized coal capacity, pulverized coal inlet temperature, pulverized coal pressure and pulverized coal outlet temperature are displayed on the module of the pulverized coal tank, and a pulverized coal capacity progress bar is displayed on the pulverized coal tank;

[0025] The air tank pressure and air tank temperature are displayed around the air tank module; the nitrogen tank pressure is displayed around the nitrogen tank module;

[0026] The air supply valve pressure, air supply valve opening upper limit, air supply valve opening lower limit, air supply valve real-time opening upper limit, air supply valve real-time opening lower limit and air supply valve air flow are displayed around the air supply valve module;

[0027] The upper limit of the fluidizing valve opening, the lower limit of the fluidizing valve opening, the upper limit of the real-time fluidizing valve opening, the lower limit of the real-time fluidizing valve opening and the air supply flow of the fluidizing valve are displayed around the module of the fluidizing valve;

[0028] The charging furnace pressure and pulverized coal capacity of the charging furnace are displayed on the charging furnace module;

[0029] The initial background color of all modules displaying data is set to blue or green;

[0030] Furthermore, when the air supply flow rate of the air supply valve is less than 350Nm 3 / h, when the injection tank pressure is ≥0.67MPa, the blast furnace coal injection system will issue a safety warning, the module background showing the injection tank pressure on the injection tank module will turn red, and the air supply flow background of the air supply valve around the air supply valve module will turn red.

[0031] Through the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The blast furnace coal injection system based on injection speed comparison provided by the present invention is based on the existing manual coal injection system, connects the weighing sensor equipment for measuring the real-time injection amount to the PLC control system, integrates various types of data according to customized deployment according to user needs, and realizes "one-button intelligent coal injection" full-automatic operation;

[0033] 2. The optimization control method of the blast furnace coal injection system based on injection speed comparison provided by the present invention collects the real-time injection amount during the coal injection process through the control system, calculates the real-time injection speed during the operation time, and compares the real-time injection speed with the set injection speed in real time. The control system automatically adjusts the parameters according to the comparison result, controls the opening of the air supply valve and the fluidizing valve, and uniformly transports the pulverized coal to the blast furnace to meet the coal injection amount required for uniform injection of the blast furnace, thereby improving the pulverized coal combustion rate and the quality of molten iron;

[0034] 3. The optimization control method for the blast furnace coal injection system based on injection speed comparison provided by the present invention is based on the injection theory, and the error between the actual injection speed and the set injection speed is controlled within a set range. The system automatically adjusts the parameters to achieve the purpose of continuous, stable and uniform coal powder transportation, improve the stability of the coal injection system, reduce human operation control errors, and reduce the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0036] Figure 1This is a centralized control screen displayed on a blast furnace coal injection system in a preferred embodiment provided by the present invention;

[0037] Figure 2 It is a schematic diagram of a preferred embodiment provided by the present invention when an early warning appears on the centralized control screen of a blast furnace coal injection system;

[0038] Figure 3 It is a schematic diagram of implementing various instructions when the present invention performs specific operations based on the preferred embodiment;

[0039] Figure 4 3. It is a schematic diagram of the result after the blast furnace coal injection optimization control method based on injection speed comparison of the present invention is implemented;

[0040] Figure 5 This is a schematic diagram of the results after artificial coal injection is still used. DETAILED DESCRIPTION

[0041] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as a limitation on the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution by example, and do not limit the scope of protection of the present invention.

[0042] As pointed out in the background technology, the coal injection of blast furnaces currently takes into account the actual cost, and most of the working conditions still rely on the operator to adjust the tank pressure, fluidizing valve and air supply valve opening according to experience to achieve fluidization, air supply and other controls. Therefore, it is easy to have problems such as untimely adjustment, uneven injection rate and large gas consumption. Starting from the working principle of the coal injection system of the blast furnace, it mainly improves the quality and stability of coal injection by optimizing coal blending, stabilizing the proportion of imported lean coal, automatically controlling the amount of coal injection, preheating coal powder, eliminating the mixed injection of nitrogen and compressed air, etc. Therefore, the prior art starts from these measures to reduce the caking phenomenon of the fluidizing device, improve the uniformity of injection, and reduce the fluctuation of injection pressure, so as to achieve efficient and stable coal injection operation.

[0043] The most advanced automation design in the prior art takes into account the error in controlling the injection rate process, that is, starting from the difference control between the actual coal injection speed of the blast furnace and the set coal injection speed, the automatic control of the coal injection of the blast furnace is performed. However, it only pays attention to the difference between the actual coal injection speed of the blast furnace and the set coal injection speed. In actual operation, as soon as the error occurs, it starts to automatically adjust, which easily leads to large fluctuations in the instantaneous injection rate, and uniform coal injection is still difficult to achieve. Therefore, the present application provides a blast furnace coal injection optimization control method based on injection speed comparison, which controls the error between the actual injection speed and the set injection speed within a set range, and makes corresponding adjustments based on the set range. Preferably, the present application controls the error between the real-time injection speed and the set injection speed within 5%, which can ensure the normal operation and stable output of the blast furnace.

[0044] Regarding the setting of this error value, the applicant fully calculated and deduced through the heat balance model, and determined the reasonable fluctuation range of the coal injection speed by establishing a mathematical model of the heat balance of the blast furnace. In this model, factors such as the heat generated by the combustion of coal powder, the heat absorbed by the charge (including the heat absorption of the processes such as iron ore reduction and slag formation), and the heat dissipation of the blast furnace are taken into account. According to the heat balance equation, the change curve of the furnace temperature under different changes in the coal injection speed is calculated. After a large number of theoretical calculations, it is found that when the coal injection speed changes within the range of ±5% of the set value, the change range of the furnace temperature is within the range of the blast furnace's own thermal regulation capacity, and will not cause serious damage to the thermal system of the blast furnace.

[0045] After many tests and optimizations, this application first confirmed the control logic of the blast furnace coal injection system based on injection speed comparison, which is mainly to compare the real-time injection speed with the set injection speed in real time. When the deviation exceeds 5%, it means that the unburned coal powder increases, the blast furnace permeability deteriorates, and the pressure difference increases, affecting the normal operation of the blast furnace.

[0046] Therefore, as the main innovation of this application, two important parameters are defined. One is to set the injection speed v 设 , the other is the real-time blowing speed v 实 ; If (v 实 -v 设 ) / v 设 >5%, start the air supply valve, the opening increases by 1% every 10 seconds, start the fluidization valve, the opening decreases by 1% every 10 seconds; if 0<<(v 实 -v 设 ) / v 设 <<5%, the opening of the air supply valve and fluidizing valve remains unchanged.

[0047] In actual operation, if v 实 <v 设, start the fluidizing valve, increase the opening by 1% every 10 seconds, and ensure that the air supply valve is within the air supply flow rate of >350Nm 3 / h, the opening is reduced by 1% every 10s.

[0048] In the above control method, the blowing speed v is set 设 , real-time blowing speed v 实 The acquisition is based on the following formula:

[0049] m 设 =n 设 ×M 设 , n 设 To set the coal ratio; M 设 To set the output, the unit is tons, T; m 设 To set the injection volume, the unit is tons, T;

[0050] v 设 =m 设 / t,m 设 is the set injection volume, in tons, T; t is the injection time, in hours, h; v 设 To set the spraying speed, the unit is tons / hour, T / h;

[0051] v 实 =m 实 / t,m 实 is the real-time injection volume, in tons, T; t is the injection time, in hours, h; v 实 It is the real-time blowing speed in tons / hour, T / h.

[0052] Among them, the real-time injection volume m 实 The injection volume m is collected by the weighing sensor installed in the coal injection system. 设 It is preset by the coal injection system.

[0053] In order to ensure that the difference between the actual coal injection speed and the set coal injection speed is maintained within 5%, it is necessary to combine the system and the control means to achieve it. Regarding the system, the present application preferably provides a blast furnace coal injection system based on injection speed comparison, including a charging furnace, a blast furnace, an air tank, a nitrogen tank and a plurality of injection tanks, the blast furnace is connected to one end of the injection tank through a first pipe, the other end of the injection tank is connected to the charging furnace through a second pipe, one end of the injection tank is connected to one end of the nitrogen tank through a third pipe, and the other end of the injection tank is connected to the other end of the nitrogen tank through a fourth pipe. The nitrogen tank is connected with the charging furnace through the fifth pipeline, and the air tank is connected with the first pipeline through the sixth pipeline; the first pipeline is equipped with a spray valve and a coal outlet valve, the second pipeline is equipped with an upper valve and a lower valve, the third pipeline is equipped with a fluidizing valve, the fourth pipeline is equipped with a punching valve, the fifth pipeline is equipped with a powder bin fluidizing valve, and the sixth pipeline is equipped with an air replenishing valve; a pressure replenishing valve is also installed between the nitrogen tank and the spray tank; the other end of the spray tank is also connected with the collector inlet pipeline through the seventh pipeline, a pressure relief valve is installed on the seventh pipeline, and a relief valve is also installed between the spray tank and the collector.

[0054] Next, the PLC control program is used to connect the weighing sensor equipment that measures the real-time injection volume to the PLC control system, and the centralized control screen is developed to realize automatic control. Regarding the development of the centralized control screen, data interaction is carried out through Ethernet, and data communication with the control system is realized using TCP / IP technology, realizing one-key automatic coal injection mode.

[0055] The upper and lower limits of the fluidizing valve opening and the air supply valve opening are developed on the centralized control screen. The preferred embodiment provided by this application is in a blast furnace coal injection system. Figure 1 As shown, two spray tanks (No. 1 spray tank, No. 2 spray tank), an air tank, a charging furnace, a blast furnace and a nitrogen tank are designed. All components are displayed on the computer interface in the form of modules. Two modules are arranged on one side of the interface. The two modules are arranged in sequence in the vertical direction. The blast furnace setting value is displayed in one module, and the blast furnace spraying parameters are displayed in another module. Figure 1 The blast furnace setting value module is located above the blast furnace injection parameter module. The information displayed in the blast furnace setting value module includes: mixed pressure upper limit, tank pressure upper limit, tank pressure lower limit, mixed pressure lower limit, tank weight upper limit, tank weight lower limit and tank unloading pressure value; the information displayed in the blast furnace injection parameter module includes: hot air pressure, tank differential pressure, nitrogen main pipe pressure, nitrogen main pipe flow, air main pipe pressure, air main pipe flow, air cumulative flow, total weight of pulverized coal, cumulative value during work, cumulative value of this shift, coal injection amount in the last hour, instantaneous amount of No. 1 injection tank, instantaneous amount of No. 2 injection tank and real-time coal injection amount.

[0056] The real-time injection speed and the set injection speed are displayed around the module of the blast furnace; the pulverized coal capacity, the injection tank inlet temperature, the injection tank pressure, and the injection tank outlet temperature are displayed on the module of the injection tank, and the pulverized coal capacity progress bar is displayed on the injection tank; the air tank pressure and the air tank temperature are displayed around the module of the air tank; the nitrogen tank pressure is displayed around the module of the nitrogen tank; the air supply valve pressure, the upper limit of the air supply valve opening, the lower limit of the air supply valve opening, the real-time upper limit of the air supply valve opening, the real-time lower limit of the air supply valve opening, and the air supply flow of the air supply valve are displayed around the module of the air supply valve; the upper limit of the fluidizing valve opening, the lower limit of the fluidizing valve opening, the real-time upper limit of the fluidizing valve opening, the real-time lower limit of the fluidizing valve opening, and the air supply flow of the fluidizing valve are displayed around the module of the fluidizing valve; the charging furnace pressure and the pulverized coal capacity of the charging furnace are displayed on the module of the charging furnace.

[0057] The operator shall reasonably set the upper and lower limits of the fluidizing valve opening and the air supply valve opening according to the actual coal injection volume demand. The PLC control program shall automatically control the fluidizing valve and the air supply valve to adjust within the set upper and lower limits according to the set upper and lower limit openings.

[0058] In the operating system, this application also innovatively sets up a safety warning mechanism. Because the minimum critical value of the air supply flow of the air supply valve is 350Nm 3 / h, if less than 350Nm 3 / h coal injection pipe will be blocked, so the initial setting of all display data modules is blue or green. When the air supply flow of the air supply valve is less than 350Nm 3 / h, the air supply flow background of the air supply valve around the air supply valve module turns red. For the tank pressure of the spray tank, the maximum tank pressure it generally withstands is 0.8MPa. When the tank pressure of the spray tank is ≥0.67MPa, the module background showing the pressure of the spray tank on the spray tank module turns red, and the red part Figure 2 The part circled in red.

[0059] At this time, for the opening of the air supply valve, when the actual injection tank exceeds the set tank pressure upper limit of 0.02MPa, the fluidizing valve is started, and the opening is reduced by 10% every 10s. At the same time, the air supply valve is started, and the opening is reduced by 5% every 10s, and it is ensured that the opening of the air supply valve is greater than or equal to the preset lower limit.

[0060] In addition, without shutting down the automatic mode, the operator can intervene and adjust the valve opening at any time to reduce the occurrence of accidents such as blockage of the main pipe and coal gun.

[0061] In a preferred embodiment, after the No. 1 injection tank, the No. 2 injection tank, an air tank, a charging furnace, a blast furnace and a nitrogen tank form a system, the PLC control system is operated according to the blast furnace coal injection optimization control method based on injection speed comparison. Figure 3Figures 3a-3g in the figure show the implementation of various instructions during specific operations, among which 350Nm 3 / h represents the air supply flow rate under standard conditions of the blast furnace, and N represents the standard conditions.

[0062] The final centralized control screen shows Figure 4 The results shown in the figure show that the automatic coal injection implemented by the blast furnace coal injection optimization control method based on injection speed comparison provided by the present application can achieve a uniform rate effect. Figure 5 , the rate of artificial coal injection is obviously uneven.

[0063] From the above, it can be seen that this application is based on the manual operation platform, combined with the blast furnace coal injection process requirements and manual coal injection experience, and uses relevant software to develop programs for remote automatic coal injection control requirements, and automatically adjusts the fluidization valve and the air supply valve opening, so as to meet the coal injection amount required for uniform blast furnace injection. The software is used to develop the centralized control function screen to achieve one-key input automation mode, and at the same time, the actual coal injection amount is monitored in real time. The operation is simple and the human-computer interaction interface is friendly. In addition, considering the safety of blast furnace operations, the system has also added a safety warning mechanism to alarm and remind the air supply flow and tank pressure exceeding the warning line, greatly improving the safety of the system.

[0064] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0065] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0066] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0067] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A blast furnace coal injection optimization control method based on injection velocity comparison, characterized in that: The specific steps include: Step S1, preset the injection amount of the coal injection system, defined as m 设 , calculate the set injection speed v 设 ; Step S2, collect the real-time injection volume through the weighing sensor installed in the coal injection system, which is defined as m 实 , calculate the real-time blowing speed v 实 ; Step S3, if (v 实 -v 设 ) / v 设 >5%, start the air supply valve, the opening increases by 1% every 10 seconds, start the fluidization valve, the opening decreases by 1% every 10 seconds; if 0<<(v 实 -b 设 ) / v 设 <<5%, the opening of the air supply valve and fluidizing valve remains unchanged; if V 实 <v 设 , start the fluidizing valve, increase the opening by 1% every 10 seconds, and the air supply valve is closed when the air supply flow rate is > 350Nm 3 / h, the opening is reduced by 1% every 10s.

2. The blast furnace coal injection optimization control method based on injection velocity comparison according to claim 1 is characterized in that: m 设 =n 设 ×M 设 , n 设 To set the coal ratio; M 设 To set the output, the unit is tons, T; m 设 To set the injection volume, the unit is tons, T; v 设 =m 设 / t,m 设 is the set injection volume, in tons, T; t is the injection time, in hours, h; v 设 To set the spraying speed, the unit is tons / hour, T / h; v 实 =m 实 / t,m 实 is the real-time injection volume, in tons, T; t is the injection time, in hours, h; v 实 It is the real-time blowing speed in tons / hour, T / h.

3. The blast furnace coal injection optimization control method based on injection velocity comparison according to claim 2 is characterized in that: When the spray tank exceeds the set tank pressure upper limit of 0.02MPa, the fluidizing valve is started, and the opening is reduced by 10% every 10s. At the same time, the air supply valve is started, and the opening is reduced by 5% every 10s, and it is ensured that the opening of the air supply valve is greater than or equal to the preset lower limit.

4. A blast furnace coal injection system based on injection velocity comparison, characterized in that: The method for optimizing the control of coal injection in a blast furnace according to claim 3 comprises a charging furnace, a blast furnace, an air tank, a nitrogen tank and a plurality of injection tanks. The blast furnace is connected to one end of the spray tank through the first pipeline, the other end of the spray tank is connected to the charging furnace through the second pipeline, one end of the spray tank is connected to one end of the nitrogen tank through the third pipeline, the other end of the spray tank is connected to the other end of the nitrogen tank through the fourth pipeline, the nitrogen tank is connected to the charging furnace through the fifth pipeline at the same time, and the air tank is connected to the first pipeline through the sixth pipeline; The first pipeline is equipped with a blowing valve and a coal outlet valve, the second pipeline is equipped with an upper valve and a lower valve, the third pipeline is equipped with a fluidizing valve, the fourth pipeline is equipped with a punching valve, the fifth pipeline is equipped with a powder bin fluidizing valve, and the sixth pipeline is equipped with an air supply valve; A pressure boost valve is also installed between the nitrogen tank and the spray tank; The other end of the spray tank is also connected to the collector inlet pipe through the seventh pipe, a pressure relief valve is installed on the seventh pipe, and a relief valve is also installed between the spray tank and the collector.

5. The blast furnace coal injection system based on injection velocity comparison according to claim 4, characterized in that: In the blast furnace coal injection system, two injection tanks, an air tank, a charging furnace, a blast furnace and a nitrogen tank are designed. All components are displayed on the computer interface in the form of modules. Two modules are arranged on one side of the interface. The two modules are arranged in sequence in the vertical direction. One module displays the blast furnace setting value, and the other module displays the blast furnace injection parameters. Display the real-time injection speed around the module of the blast furnace and set the injection speed; The pulverized coal capacity, pulverized coal inlet temperature, pulverized coal pressure and pulverized coal outlet temperature are displayed on the module of the pulverized coal tank, and a pulverized coal capacity progress bar is displayed on the pulverized coal tank; The air tank pressure and air tank temperature are displayed around the air tank module; the nitrogen tank pressure is displayed around the nitrogen tank module; The air supply valve pressure, air supply valve opening upper limit, air supply valve opening lower limit, air supply valve real-time opening upper limit, air supply valve real-time opening lower limit and air supply valve air flow are displayed around the air supply valve module; The upper limit of the fluidizing valve opening, the lower limit of the fluidizing valve opening, the upper limit of the real-time fluidizing valve opening, the lower limit of the real-time fluidizing valve opening and the air supply flow of the fluidizing valve are displayed around the module of the fluidizing valve; The charging furnace pressure and pulverized coal capacity of the charging furnace are displayed on the charging furnace module; The initial background color of all modules that display data is set to blue or green.

6. The blast furnace coal injection system based on injection velocity comparison according to claim 5, characterized in that: When the air supply flow of the air supply valve is less than 350Nm 3 / h, when the injection tank pressure is ≥0.67MPa, the blast furnace coal injection system will issue a safety warning, the module background showing the injection tank pressure on the injection tank module will turn red, and the air supply flow background of the air supply valve around the air supply valve module will turn red.

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