Experimental device and method for simulating combustion rate of pulverized coal injected by blast furnace

Abstract

The invention discloses an experimental device and method for simulating the combustion rate of pulverized coal injected by a blast furnace, and belongs to the technical field of blast furnace ironmaking. The experimental device comprises a hot air generation unit, a pulverized coal injection unit, a fuel gas injection unit, a pulverized coal hot air combustion unit, a tail gas treatment unit and a data processing unit; simulated injection of combustion-supporting gas, carrier gas and fuel gas in the blast furnace injection pulverized coal combustion process can be achieved, simulation of the blast furnace injection pulverized coal combustion process is accurately achieved, and then the pulverized coal combustion rates under different combustion conditions are accurately obtained. According to the device and the method, process condition simulation under different blast furnace combustion operation environments can be met, the combustion behavior of blast furnace injection pulverized coal at the front end of a tuyere is accurately simulated, and the combustion rate of the pulverized coal under different combustion conditions is accurately measured; and a basis is provided for analyzing the influence of different process control parameters on the blast furnace pulverized coal injection combustion condition, and optimization and application of the blast furnace pulverized coal injection technology are promoted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of blast furnace ironmaking, and particularly relates to an experimental device and method for simulating the combustion rate of pulverized coal injected into a blast furnace. BACKGROUND

[0002] The pulverized coal injection technology for a blast furnace is a main technical means for reducing the cost of blast furnace ironmaking and optimizing the production operation of a blast furnace, and has been widely popularized and applied in steel enterprises at home and abroad.

[0003] Among them, the pulverized coal injected into the blast furnace burns before the tuyere to release heat and generate reducing gas, which can partially replace the role of coke as a heating agent and a reducing agent in the furnace. At present, advanced pulverized coal injection for a blast furnace can replace 30% of the coke consumption of a blast furnace, and the types of coal powder applied to the blast furnace injection include anthracite, bituminous coal, lean coal, lignite, semicoke, semi-coke, upgraded coal, etc. Among them, anthracite has a high fixed carbon content and a high calorific value, and has a high coal / coke replacement ratio when applied to the blast furnace injection; the fixed carbon content of bituminous coal is low, and the calorific value is also lower than that of anthracite, but the combustion performance of bituminous coal is good, which can speed up the combustion efficiency before the tuyere of the blast furnace and reduce the amount of unburned coal powder, which is beneficial to improving the injection ratio of coal. Based on this, the blast furnaces at home and abroad currently often use a method of mixing and injecting anthracite and bituminous coal, on the one hand, to take advantage of the characteristics of high coal / coke replacement ratio of anthracite to reduce the coke consumption of the blast furnace, and on the other hand, to take advantage of the characteristics of excellent combustion performance of bituminous coal to improve the combustion rate of anthracite before the tuyere and reduce the amount of unburned coal powder, thereby promoting the stable operation of the blast furnace.

[0004] At present, how to improve the combustion rate of the pulverized coal injected into the blast furnace before the tuyere has become a key concern of ironmaking producers, but the pulverized coal injection process for a blast furnace is often carried out in a high-temperature, high-pressure and high-speed environment, which makes it very difficult to directly measure the production site. For this reason, the current research on the combustion process of the pulverized coal injected into the blast furnace before the tuyere is mostly carried out by using a model calculation method, which can optimize the pulverized coal injection operation for a blast furnace to a certain extent, but the calculation results are often affected by the input combustion kinetic parameters, causing the calculation results to not actually reflect the actual combustion process of the pulverized coal injected into the blast furnace. In addition, some researchers take samples of the blast furnace dust and measure the carbon content in the dust to determine the consumption of the coal powder in the blast furnace according to the different sources of carbon. This method takes the production blast furnace as the experimental object, and has problems such as high cost and poor timeliness.

[0005] Therefore, how to efficiently and accurately simulate the combustion state of the pulverized coal in the tuyere of the blast furnace and measure the combustion rate of the coal powder under different combustion conditions has become a key problem affecting the application of the pulverized coal injection technology for a blast furnace, and corresponding research and verification are urgently needed. SUMMARY In view of one or more of the above defects or improvement needs of the prior art, the present application provides a device and method for simulating the combustion rate of pulverized coal injection in a blast furnace, which can accurately simulate the combustion process of pulverized coal injection in a blast furnace and accurately obtain the combustion rate of pulverized coal under different combustion conditions, thereby providing sufficient basis and support for the application of pulverized coal injection technology in a blast furnace.

[0006] To achieve the above-mentioned purpose, one aspect of the present application provides a device for simulating the combustion rate of pulverized coal injection in a blast furnace, comprising: a hot air generating unit, which comprises a combustion-supporting gas distribution system and a heating system, the heating system being configured to heat the combustion-supporting gas distributed by the combustion-supporting gas distribution system, so as to simulate the composition, temperature and pressure of the hot air in a blast furnace; a pulverized coal injection unit, which comprises a carrier gas distribution system, a pulverized coal feeding system and a pulverized coal injection system, the carrier gas distribution system being configured to distribute carrier gas and uniformly deliver and inject the pulverized coal fed by the pulverized coal feeding system through the pulverized coal injection system; a fuel gas injection unit, which comprises a fuel gas distribution system and a fuel gas injection lance, the fuel gas distribution system being configured to simulate the distribution of fuel gas in a blast furnace, and the fuel gas injection lance being configured to uniformly inject the fuel gas; a pulverized coal hot air combustion unit, which has a combustion chamber simulating a blast furnace, the hot air generating unit, the pulverized coal injection system and the fuel gas injection lance being in communication with the combustion chamber, so as to realize the contact combustion of the pulverized coal, the fuel gas and the combustion-supporting gas, simulate the combustion process of the pulverized coal injection and the fuel gas in a blast furnace before the tuyere, and realize the accurate simulation of the combustion process of the pulverized coal injection in a blast furnace; a tail gas treatment unit, which is in communication with the combustion chamber, configured to receive the tail gas after combustion and treat and analyze the composition of the tail gas; a data processing unit, which is electrically connected with other units respectively, configured to receive the process data and tail gas composition data fed back by each unit, and calculate the combustion rate of the pulverized coal under different process conditions.

[0007] The hot air generating unit is used to accurately introduce the high-temperature combustion-supporting gas after distribution into the pulverized coal hot air combustion unit; the fuel gas injection unit is used to accurately introduce the fuel gas after distribution into the pulverized coal hot air combustion unit, the fuel gas is combusted after contacting with the high-temperature combustion-supporting gas, and the composition of the tail gas is analyzed by the tail gas treatment unit; the pulverized coal injection unit is used to accurately introduce the pulverized coal after distribution into the pulverized coal hot air combustion unit by using the carrier gas after distribution, the pulverized coal is combusted after contacting with the high-temperature combustion-supporting gas and the fuel gas, and the composition of the tail gas is analyzed by the tail gas treatment unit; the data processing unit is used to calculate the combustion rate data of the injected pulverized coal by combining the composition changes of the tail gas before and after the pulverized coal is introduced.

[0008] As a further improvement of the present application, the tail gas treatment unit comprises a tail gas cooling and purifying unit and a tail gas analysis unit arranged in sequence. The tail gas cooling and purifying unit comprises a tail gas cooler for cooling the combustion products, a solid product collector for collecting the solid products in the combustion products, and a decompressor, a dust filter and a dryer arranged in sequence and in pipeline communication for purifying the cooled tail gas. The tail gas analysis unit is in communication with the dryer and is used for analyzing the components in the tail gas.

[0009] As a further improvement of the present application, a plurality of thermocouples are arranged in the combustion chamber for detecting the temperature at the corresponding positions in the combustion chamber, and each of the thermocouples is electrically connected to the data processing unit. and / or The heating system is a microwave plasma heating system, which comprises a microwave coupling cavity and a plurality of microwave magnetrons arranged on the microwave coupling cavity, and each microwave magnetron is connected to the microwave coupling cavity through a transmission waveguide.

[0010] As a further improvement of the present application, the combustion-supporting gas distribution system, the carrier gas distribution system and the fuel gas distribution system each comprise a gas mixing bottle and a plurality of gas cylinders in pipeline communication with the gas mixing bottle.

[0011] As a further improvement of the present application, at least one nitrogen cylinder is included in the plurality of gas cylinders for cleaning the gas mixing bottle and the pipeline by introducing nitrogen into the gas mixing bottle and the pipeline. and / or The pipeline between the gas mixing bottle and each of the gas cylinders is provided with a pressure gauge and a flow meter; and / or Each of the gas mixing bottles is provided with a flow meter on the pipeline connected to the pulverized coal hot air combustion unit.

[0012] As a further improvement of the present application, the plurality of gas cylinders in the combustion-supporting gas distribution system comprise a nitrogen cylinder, an oxygen cylinder, a compressed air cylinder and a carbon dioxide cylinder. and / or The plurality of gas cylinders in the carrier gas distribution system comprise a nitrogen cylinder, a compressed air cylinder and a carbon dioxide cylinder. and / or The plurality of gas cylinders in the fuel gas distribution system comprise a nitrogen cylinder, a carbon monoxide cylinder, a hydrogen cylinder and a methane cylinder.

[0013] As a further improvement of the present application, the pulverized coal feeding system comprises a coal storage barrel, a disc feeder and a servo motor controller; and the pulverized coal injection system comprises a coal conveying pipe and a pulverized coal injection gun. The disc feeder is connected to the discharge port of the coal storage barrel for taking coal from the coal storage barrel; the servo motor controller is connected to the disc feeder for controlling the rotating speed of the disc feeder to adjust the coal powder conveying amount; and One end of the disc feeder is communicated with the pipeline of the carrier gas distribution system, and the other end is communicated with one end of the coal conveying pipe, and the other end of the coal conveying pipe is communicated with the coal powder injection gun; the coal powder injection gun is connected to the coal powder hot air combustion unit for injecting coal powder into the combustion chamber.

[0014] Another aspect of the present application also provides a method for simulating the combustion rate experiment of blast furnace coal injection, which is realized by using the experimental device for simulating the combustion rate of blast furnace coal injection, and includes the following steps: (1) According to the composition and pressure of the combustion-supporting gas in the experimental scheme, the combustion-supporting gas is mixed and heated to simulate the composition, temperature and pressure of the blast furnace hot air; the combustion-supporting gas is accurately measured and then introduced into the coal powder hot air combustion unit; (2) According to the composition of the fuel gas in the experimental scheme, the fuel gas is mixed, and the fuel gas is accurately measured and then injected into the coal powder hot air combustion unit by the fuel gas injection gun; the fuel gas is combusted after being contacted with the high-temperature combustion-supporting gas, and the composition of the tail gas after combustion is analyzed and recorded by the tail gas treatment unit; (3) According to the parameter design of the coal powder carrier gas in the experimental scheme, the carrier gas is mixed, the carrier gas is accurately taken from the coal powder feeding system and then injected into the coal powder hot air combustion unit through the coal powder injection system; the coal powder is combusted after being contacted with the high-temperature combustion-supporting gas and the fuel gas, and the composition of the tail gas after combustion is analyzed and recorded by the tail gas treatment unit; (4) The combustion rate data of the injected coal powder is calculated according to the composition change of the tail gas before and after the coal powder injection.

[0015] As a further improvement of the present application, in step (3), the unburned coal powder sample after combustion is collected by the tail gas treatment unit, and the coal powder combustion rate is calculated by the ash balance method, and the coal powder combustion rate data measured in step (4) is verified; and / or The composition analysis of the tail gas by the tail gas treatment unit includes the measurement of the content of carbon dioxide, carbon monoxide, methane, hydrogen and oxygen in the tail gas.

[0016] As a further improvement of the present application, the flow rate of the combustion-supporting gas introduced into the coal powder hot air combustion unit is greater than 5 L / min, and the temperature of the combustion-supporting gas is greater than 900℃; and / or The injection flow rate of the fuel gas is greater than 1 L / min; and / or The injection amount of the pulverized coal is greater than 1 g / min.

[0017] The above technical features can be combined with each other as long as they do not conflict with each other.

[0018] Overall, compared with the prior art, the above technical solutions conceived by the present application have the beneficial effects including: The simulation blast furnace coal injection combustion rate experimental device of the present application, including hot air generating unit, coal injection unit, fuel gas injection unit, coal hot air combustion unit, tail gas treatment unit and data processing unit, by using the corresponding system setting in each unit, can realize the simulation injection of combustion-supporting gas, carrier gas and fuel gas in the process of blast furnace coal injection combustion, accurately realize the simulation of the blast furnace coal injection combustion process, and further accurately obtain the coal combustion rate under different combustion conditions, providing sufficient basis and support for the application of blast furnace coal injection technology.

[0019] The simulation blast furnace coal injection combustion rate experimental device and method of the present application are convenient to control, have strong adaptability, can meet the process condition simulation under different blast furnace combustion operation environments, accurately simulate the combustion behavior of blast furnace coal injection at the front end of the tuyere, and accurately realize the combustion rate determination of coal under different combustion conditions, providing a basis for analyzing the influence of different process control parameters on the blast furnace coal injection combustion condition, promoting the optimization and application of blast furnace coal injection technology, reducing the production cost of blast furnace ironmaking, and having excellent economic benefits and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 is the overall structure schematic diagram of the simulation blast furnace coal injection combustion rate experimental device in the embodiments of the present application; In all the drawings, the same reference signs represent the same technical features, specifically: 100, hot air generating unit; 200, coal injection unit; 300, fuel gas injection unit; 400, coal hot air combustion unit; 500, tail gas cooling and purification unit; 600, tail gas analysis unit; 700, data processing unit; 101, first gas cylinder; 102, second gas cylinder; 103, third gas cylinder; 104, fourth gas cylinder; 105, first pressure gauge; 106, first flow meter; 107, first mixing cylinder; 108, second flow meter; 109, microwave magnetron; 110, transmission waveguide; 111, microwave coupling cavity; 201, first carrier gas cylinder; 202, second carrier gas cylinder; 203, third carrier gas cylinder; 204, second pressure gauge; 205, third flow meter; 206, second mixing cylinder; 207, fourth flow meter; 208, coal storage barrel; 209, disc feeder; 210, servo motor controller; 211, coal conveying pipe; 212, coal powder injection lance; 301, first fuel gas cylinder; 302, second fuel gas cylinder; 303, third fuel gas cylinder; 304, fourth fuel gas cylinder; 305, third pressure gauge; 306, fifth flow meter; 307, third mixing cylinder; 308, sixth flow meter; 309, fuel gas injection pipe; 310, fuel gas injection lance; 401, heat-resistant reaction tube; 402, thermocouple; 501, tail gas cooler; 502, solid product collector; 503, pressure reducer; 504, fourth pressure gauge; 505, dust filter; 506, dryer; 601, gas analyzer; 602, tail gas discharge device. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0023] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] Further, unless otherwise explicitly specified and limited, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not imply or suggest relative importance or a specific number of the technical features indicated. Thus, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0027] In the following, with reference to Figure 1 The combustion rate experiment device for simulating the injection of pulverized coal in a blast furnace is described according to the preferred embodiment of the present application.

[0028] Specifically, the combustion rate experiment device for simulating the injection of pulverized coal in a blast furnace in the preferred embodiment includes a hot air generating unit 100, a pulverized coal injection unit 200, a fuel gas injection unit 300, a pulverized coal hot air combustion unit 400, a tail gas treatment unit, and a data processing unit 700.

[0029] The hot air generating unit 100 is used to generate combustion-supporting gas for simulating blast furnace combustion, which includes a combustion-supporting gas distribution system and a heating system. The combustion-supporting gas distribution system is used to configure the combustion-supporting gas during the simulation of blast furnace combustion, and to adjust the composition and pressure of the combustion-supporting gas; the heating system is connected with the combustion-supporting gas distribution system, and is used to heat the configured combustion-supporting gas to regulate the temperature of the combustion-supporting gas.

[0030] The pulverized coal injection unit 200 is used for simulating the pulverized coal injection feeding during the blast furnace combustion, and comprises a carrier gas distribution system, a pulverized coal feeding system and a pulverized coal injection system. The carrier gas distribution system is used for configuring the carrier gas for simulating the pulverized coal feeding during the blast furnace combustion, and adjusting the composition and pressure of the carrier gas. The pulverized coal feeding system is used for continuously feeding the pulverized coal, and the discharge port thereof is connected with the carrier gas distribution system, so that the pulverized coal is continuously fed by the carrier gas into the pulverized coal injection system. Correspondingly, the pulverized coal injection system is communicated with the pulverized coal hot blast combustion unit 400, and is used for continuously and uniformly delivering and injecting the pulverized coal into the pulverized coal hot blast combustion unit 400, so as to simulate the injection of the pulverized coal during the blast furnace combustion.

[0031] The fuel gas injection unit 300 is used for simulating the fuel gas injection feeding during the blast furnace combustion, and comprises a fuel gas distribution system and a fuel gas injection lance 310. The fuel gas distribution system is used for simulating the configuration of the blast furnace fuel gas, and adjusting the composition of the fuel gas. The fuel gas injection lance 310 is connected with the fuel gas distribution system, and is used for uniformly injecting the configured blast furnace fuel gas into the pulverized coal hot blast combustion unit 400 in the form of simulating the blast furnace combustion.

[0032] The pulverized coal hot blast combustion unit 400 has a combustion chamber simulating the blast furnace, and is connected with the hot blast generation unit 100, the pulverized coal injection system and the fuel gas injection lance 310 respectively, and is used for carrying out the contact combustion of the combustion-supporting gas, the pulverized coal and the fuel gas, and further simulating the combustion process of the injected pulverized coal and the blast furnace fuel gas in front of the combustion-supporting gas tuyere.

[0033] The tail gas treatment unit is communicated with the combustion chamber of the pulverized coal hot blast combustion unit 400, and is used for receiving the combusted tail gas and treating and analyzing the composition of the tail gas.

[0034] The data processing unit 700 is electrically connected with the aforementioned units respectively, and is used for receiving the process data (such as the composition and pressure data of the combustion-supporting gas, the composition and pressure data of the carrier gas, the composition data of the fuel gas, etc.) and the composition analysis data of the treated tail gas, so as to carry out the pulverized coal combustion calculation, and finally obtain the pulverized coal combustion rate data under different process conditions.

[0035] Further, the tail gas treatment unit in the preferred embodiment comprises a tail gas cooling and purification unit 500 and a tail gas analysis unit 600. The tail gas cooling and purification unit 500 is used for cooling the combusted products, realizing the gas-solid separation in the combusted products, collecting the solid products and purifying the separated tail gas. For the tail gas purification in the preferred embodiment, it preferably comprises a dust filtration process, a tail gas drying process, etc.

[0036] Specifically, the tail gas cooling and purifying unit 500 in the preferred embodiment comprises a tail gas cooler 501 and a solid product collector 502, which are in communication with the bottom of the combustion chamber, the former being used for cooling the combustion products, and the latter being used for collecting the solid products (e.g. unburned coal powder) in the combustion products.

[0037] Meanwhile, the tail gas cooling and purifying unit 500 also preferably comprises a pressure reducer 503, a dust filter 505 and a dryer 506, which are in communication with each other in sequence. The pressure reducer 503 is used for reducing the pressure of the tail gas after the cooling treatment, the tail gas after the pressure reduction is delivered to the dust filter 505 for dust filtration, and the drying of the tail gas is completed in the dryer 506, so as to finally obtain the cooled and purified tail gas.

[0038] Preferably, a fourth pressure gauge 504 is also preferably arranged on the pipeline between the pressure reducer 503 and the dust filter 505, which is used for detecting the pressure of the tail gas after the pressure reduction by the pressure reducer 503.

[0039] Further, the tail gas analysis unit 600 in the preferred embodiment is in communication with the tail gas cooling and purifying unit 500 (specifically, the dryer 506), which is used for receiving the tail gas after the purification treatment and analyzing the composition of the tail gas.

[0040] As an example, the tail gas analysis unit 600 in the preferred embodiment is in communication with the dryer 506, which comprises a gas analyzer 601 and a tail gas discharge device 602, the former being used for measuring the content of different gases in the tail gas, such as the content of carbon dioxide, carbon monoxide, methane, hydrogen and oxygen; and the latter being used for discharging the tail gas.

[0041] It can be understood that a pumping module is preferably arranged between the tail gas cooling and purifying unit 500 and the tail gas analysis unit 600, which is used for pumping the tail gas.

[0042] Further, the hot air generating unit 100 in the preferred embodiment is a microwave plasma hot air generating unit, and the heating system thereof is preferably a microwave plasma heating system, which comprises a microwave magnetron 109, a transmission waveguide 110 and a microwave coupling cavity 111 as shown in Figure 1 The microwave coupling cavity 111 is in communication with the combustion-supporting gas distribution system, which is used for heating the distributed combustion-supporting gas by the microwave effect. Through the control of the microwave magnetron 109, the combustion-supporting gas with a temperature simulating the temperature required by the blast furnace combustion is finally obtained.

[0043] It can be understood that the microwave magnetron 109 arranged for a single microwave coupling cavity 111 can be a single one or multiple ones (e.g. Figure 1The two shown), and each microwave magnetron 109 is in communication with a microwave coupling cavity 111 through a transmission waveguide 110.

[0044] In more detail, the combustion-supporting gas distribution system in the preferred embodiment includes a first gas mixing bottle 107 and a plurality of gas bottles in communication with the first gas mixing bottle 107 through pipelines. The flow rate of the pipeline where each gas bottle is located can be adjusted as needed, so that different components and different volumes of gas can be mixed in the first gas mixing bottle 107 to obtain the configured combustion-supporting gas.

[0045] In actual installation, a first pressure gauge 105 and a first flow meter 106 are preferably arranged on the pipeline between each gas bottle and the first gas mixing bottle 107 to correspondingly control the pressure and flow rate of the raw gas output from each gas bottle to the first gas mixing bottle 107, thereby realizing the design of the component ratio and pressure of the combustion-supporting gas.

[0046] As an example, in the preferred embodiment as shown, Figure 1 In the preferred embodiment as shown, the combustion-supporting gas distribution system includes a first gas bottle 101, a second gas bottle 102, a third gas bottle 103, and a fourth gas bottle 104. The first gas bottle 101 is preferably a nitrogen gas bottle, the second gas bottle 102 is preferably a compressed air bottle, the third gas bottle 103 is preferably an oxygen gas bottle, and the fourth gas bottle 104 is preferably a carbon dioxide gas bottle. In this way, the carbon dioxide content, oxygen content, and nitrogen content of the combustion-supporting gas can be controlled, and the pressure of the combustion-supporting gas can be controlled, thereby accurately completing the simulation of the combustion-supporting gas input during blast furnace combustion.

[0047] Of course, the number of gas bottles and the types of gas stored in the gas bottles can be adjusted as needed according to actual installation requirements, thereby meeting the configuration requirements of combustion-supporting gas with different components.

[0048] In more detail, a second flow meter 108 is preferably arranged on the pipeline between the first gas mixing bottle 107 and the heating system to monitor the delivery flow rate of the configured combustion-supporting gas.

[0049] Similar to the combustion-supporting gas distribution system described above, the carrier gas distribution system in the preferred embodiment preferably includes a second gas mixing bottle 206 and a plurality of carrier gas bottles in communication with the second gas mixing bottle 206 through pipelines. By mixing different components and different pressure gases in the plurality of carrier gas bottles in the second gas mixing bottle 206, the carrier gas required for the experiment can be correspondingly obtained.

[0050] As an example, in the preferred embodiment as shown, Figure 1In the preferred embodiment shown, the carrier gas distribution system includes a first carrier gas cylinder 201, a second carrier gas cylinder 202 and a third carrier gas cylinder 203. Each carrier gas cylinder is provided with a second pressure gauge 204 and a third flow meter 205 on the pipeline before the second mixing cylinder 206, so as to monitor and control the pressure and flow of the gas output by each carrier gas cylinder, and finally complete the configuration of the corresponding component, pressure carrier gas in the second mixing cylinder 206.

[0051] In more detail, the aforementioned first carrier gas cylinder 201 is preferably a nitrogen cylinder, the second carrier gas cylinder 202 is preferably a compressed air cylinder, and the third carrier gas cylinder 203 is preferably a carbon dioxide cylinder. The configuration and control of the three gases complete the configuration of the pulverized coal carrier gas under the blast furnace combustion process.

[0052] Similarly, the fuel gas distribution system in the preferred embodiment also includes a plurality of fuel gas cylinders and a mixing cylinder, i.e. a third mixing cylinder 307 and a plurality of fuel gas cylinders in communication with the third mixing cylinder 307 by pipelines. Each fuel gas cylinder corresponds to the supply of different types of gas to achieve the mixed injection of fuel gas supplied during the blast furnace combustion.

[0053] As an example, in the case of a blast furnace combustion process as shown in Figure 1 In the preferred embodiment shown, the fuel gas is preferably hydrogen-rich fuel gas, and the plurality of fuel gas cylinders preferably includes a first fuel gas cylinder 301, a second fuel gas cylinder 302, a third fuel gas cylinder 303 and a fourth fuel gas cylinder 304. In more detail, the four fuel gas cylinders are further preferably nitrogen cylinders, carbon monoxide cylinders, hydrogen cylinders and methane cylinders. At the same time, a third pressure gauge 305 and a fifth flow meter 306 are preferably provided on the pipeline between each gas cylinder and the third mixing cylinder 307, to detect the gas pressure and gas flow in each fuel gas cylinder, respectively, to ensure the accuracy of the component ratio of the mixed fuel gas in the third mixing cylinder 307.

[0054] It should be noted that as the nitrogen cylinder of the first fuel gas cylinder 301, the nitrogen stored therein is not fuel gas. The purpose of its arrangement is to: before the mixing of fuel gas in the third mixing cylinder 307, the air in the third mixing cylinder 307 and the fuel gas delivery pipeline is preferably completely removed by the nitrogen in the first fuel gas cylinder 301, which plays a role in cleaning the gas environment in the pipeline.

[0055] Correspondingly, a flow meter (i.e. a sixth flow meter 308) is preferably provided on the pipeline (fuel gas injection pipeline 309) of the third mixing cylinder 307 to the pulverized coal hot blast combustion unit 400, so as to achieve accurate measurement of the injection flow of the mixed fuel gas.

[0056] With the aforementioned carrier gas distribution system and fuel gas distribution system configured accordingly, in the preferred embodiment, the pulverized coal injection unit 200 and the fuel gas injection unit 300 are further equipped with a pulverized coal injection system and a fuel gas injection gun 310 connected to the pulverized coal hot air combustion unit 400, thereby performing pulverized coal injection and fuel gas injection. Correspondingly, a pulverized coal feeding system is also provided between the pulverized coal injection system and the carrier gas distribution system for continuous pulverized coal feeding.

[0057] Specifically, in the preferred embodiment, the pulverized coal feeding system includes a coal storage bin 208 and a disc feeder 209 connected to its outlet, with a servo motor controller 210 corresponding to the disc feeder 209. The second mixing cylinder 206 of the carrier gas distribution system is connected to the disc feeder 209 via a pipeline equipped with a fourth flow meter 207. The disc feeder 209 takes coal from the coal storage bin 208, and the mixed carrier gas then delivers the taken pulverized coal to the pulverized coal injection system.

[0058] Correspondingly, the rotational speed of the disc feeder 209 can be controlled by the servo motor controller 210, and the precise adjustment of the coal powder conveying amount can be achieved through the rotational speed control of the disc feeder 209.

[0059] More specifically, in the preferred embodiment, the pulverized coal injection system includes a coal conveying pipe 211 connected to the disc feeder 209, and a pulverized coal injection gun 212 is provided at the other end of the coal conveying pipe 211. The pulverized coal injection gun 212 is connected to the pulverized coal hot air combustion unit 400 and is used to inject the fed pulverized coal into the pulverized coal hot air combustion unit 400.

[0060] Similarly, in the preferred embodiment, the fuel gas spray gun 310 is also connected to the third mixing bottle 307 through the fuel gas injection pipe 309 with a flow meter (sixth flow meter 308), and the fuel gas spray gun 310 is connected to the pulverized coal hot air combustion unit 400 to inject the mixed fuel gas into the pulverized coal hot air combustion unit 400.

[0061] In actual setup, the positions of the pulverized coal injection gun 212 and the fuel gas injection gun 310 on the pulverized coal hot air combustion unit 400 correspond to the air outlet of the hot air generating unit 100, for example... Figure 1 The two sides of the combustion-supporting gas outlet shown are respectively located on both sides to ensure that pulverized coal and fuel gas can come into contact and burn at the outlet.

[0062] It is understandable that, based on actual setup requirements, the injection angles of the pulverized coal injection gun 212 and the fuel gas injection gun 310 can be simulated and designed according to actual conditions, which will not be elaborated here. Furthermore, the injection of pulverized coal and fuel gas can be carried out separately or simultaneously.

[0063] Furthermore, in the preferred embodiment, the pulverized coal hot air combustion unit 400 includes, as follows:Figure 1 The heat-resistant reaction tube 401 shown in the figure is formed with a fuel chamber, and the heat-resistant reaction tube 401 is formed with a connecting port of the air outlet of the hot air generating unit 100, the coal powder injection lance 212, and the fuel gas injection lance 310, respectively, so as to facilitate the connection of the three units.

[0064] Meanwhile, a plurality of thermocouples 402 are also arranged on the heat-resistant reaction tube 401 to monitor the temperature of the corresponding area in the combustion chamber during the simulation of the blast furnace combustion. Preferably, the plurality of thermocouples 402 are arranged at intervals in the height direction of the heat-resistant reaction tube 401, and each thermocouple 402 is electrically connected to the data processing unit 700, so that the test temperature data of each point can be transmitted to the data processing unit 700 in real time.

[0065] Based on the arrangement of the foregoing experimental device for simulating the combustion rate of the blast furnace injected with coal powder, as another aspect of the present application, an experimental method for simulating the combustion rate of the blast furnace injected with coal powder is also provided, which preferably comprises the following processes: (1) According to the composition and pressure of the combustion-supporting gas in the experimental scheme, the gas in each gas cylinder of the hot air generating unit 100 is controlled to be mixed in the first gas mixing cylinder 107, and the mixed combustion-supporting gas is accurately measured by the second flow meter 108 and then introduced into the coal powder hot air combustion unit 400. After the sealing performance of the system is determined, the heating system is started to heat the combustion-supporting gas, and a stable high-temperature combustion-supporting gas is formed in the combustion chamber.

[0066] During the transportation of the combustion-supporting gas, the temperature of the combustion-supporting gas can be controlled by the heating system according to the needs of the experiment, so as to simulate the hot air input before the tuyere during the combustion of the blast furnace coal powder.

[0067] More preferably, the flow rate of the high-temperature combustion-supporting gas is preferably greater than 5 L / min, and further preferably greater than 40 L / min. At the same time, the temperature of the combustion-supporting gas is preferably greater than 900°C, and further preferably greater than 1200°C.

[0068] (2) According to the composition of the fuel gas in the experimental scheme, the gas in each fuel gas cylinder in the fuel gas injection unit 300 is controlled to be mixed in the third gas mixing cylinder 307, and the mixed fuel gas is accurately measured by the sixth flow meter 308 and then injected by the fuel gas injection lance 310 into the coal powder hot air combustion unit 400; the fuel gas is combusted after being contacted with the high-temperature combustion-supporting gas, and after the system is stabilized, the composition of the tail gas after combustion is analyzed and recorded by the tail gas treatment unit.

[0069] In actual operation, the flow rate of the fuel gas injected by the fuel gas injection lance 310 is preferably greater than 1 L / min, and further preferably greater than 3 L / min.

[0070] More specifically, the aforementioned component analysis process of the tail gas mainly includes the measurement of the content of carbon dioxide, carbon monoxide, methane, hydrogen and oxygen in the tail gas.

[0071] Preferably, before the mixing of the fuel gas, the air in the third mixing bottle 307 and the fuel gas blowing pipeline is preferably excluded by the nitrogen bottle in the fuel gas distribution system.

[0072] (3) According to the parameter design of the coal powder carrier gas in the experimental scheme, the carrier gas in the carrier gas distribution system is controlled to be distributed, and the mixing of the carrier gas is completed in the second mixing bottle 206; the mixed carrier gas is accurately measured by the fourth flow meter 207 and then transported to the coal powder feeding system; at the same time, the speed of the disc feeder 209 is controlled by the servo motor controller 210, and the coal powder in the coal storage barrel 208 is accurately fed to the coal conveying pipe 211 by the disc feeder 209; then the coal powder is sprayed into the coal powder hot air combustion unit 400 by the coal powder spray gun 212, and the coal powder is burned after being contacted with high-temperature combustion-supporting gas and fuel gas; after the system is stabilized, the composition of the tail gas after combustion is analyzed and recorded by the tail gas treatment unit.

[0073] In actual operation, the spraying amount of coal powder by the coal powder spray gun 212 is preferably greater than 1 g / min, and further preferably greater than 3 g / min.

[0074] More specifically, the products after the combustion of the coal powder are cooled by the tail gas cooler 501 in the tail gas cooling and purification unit 500, the cooled solid products enter the solid product collector 502 to obtain the unburned coal powder sample for subsequent analysis and testing; the gaseous products enter the dust filter 505 after being reduced in pressure by the pressure reducer 503 for purification, the purified tail gas enters the dryer 506 to remove the water in the tail gas, and the dried tail gas enters the gas analyzer 601 through the sampling pump to measure the content of carbon dioxide, carbon monoxide, methane, hydrogen and oxygen in the tail gas sample.

[0075] (4) The combustion rate data of the sprayed coal powder is calculated according to the changes of the components (carbon dioxide, carbon monoxide, methane, hydrogen and oxygen) in the tail gas before and after the coal powder is sprayed.

[0076] Further, for the unburned coal powder sample collected by the solid product collector 502 in the preferred embodiment, the coal powder combustion rate is preferably calculated by the ash balance method to verify the measured coal powder combustion rate data.

[0077] As follows, the aforementioned experimental method is further verified and explained by specific embodiments 1-3.

[0078] Embodiment 1: In this embodiment, the experimental process includes: S1, open the compressed air bottle and oxygen bottle of the hot air generating unit 100, and prepare the hot air according to the experimental scheme by the first pressure gauge 105 and the first flowmeter 106. Different gases are mixed in the first mixing bottle 107, and the mixed combustion-supporting gas is accurately measured by the second flowmeter 108 and then introduced into the coal powder hot air combustion unit 400 and the tail gas cooling and purification unit 500. After determining that the sealing performance of the system is good, the heating system (microwave plasma) is started to heat the combustion-supporting gas, and stable high-temperature combustion-supporting gas is generated in the heat-resistant reaction tube 401.

[0079] The temperature of the high-temperature combustion-supporting gas reaches 1200℃, the oxygen content is 23%, and the flow rate is 49L / min.

[0080] S2, open the nitrogen bottle of the fuel gas injection unit 300, and then open the carbon monoxide bottle and the hydrogen bottle after the third mixing bottle 307 and the air in the pipeline are completely removed. The flow rates of various gases are controlled by the third pressure gauge 305 and the fifth flowmeter 306 to prepare the hydrogen-rich gas required by the experimental scheme. The hydrogen-rich gas is mixed in the third mixing bottle 307. After the flow rate of the mixed hydrogen-rich gas is accurately controlled by the sixth flowmeter 308, the hydrogen-rich gas is burned in the heat-resistant reaction tube 401 after being contacted with the high-temperature combustion-supporting gas through the pipeline and the fuel gas lance 310. After the system stabilizes, the carbon dioxide, carbon monoxide, methane, hydrogen, and oxygen contents in the tail gas are measured by the gas analyzer 601 and recorded.

[0081] The volume ratio of carbon monoxide in the mixed gas is 30%, and the volume ratio of hydrogen is 70%. The flow rate of the hydrogen-rich gas is controlled to be 5L / min.

[0082] S3, open the carrier gas bottles of the coal powder injection unit 200, and prepare the coal powder carrier gas in the experimental scheme by adjusting the second pressure gauge 204 and the third flowmeter 205. The carrier gas is mixed in the second mixing bottle 206 and then introduced into the coal powder feeding system through the fourth flowmeter 207. The coal powder sample is first loaded into the coal storage barrel 208, and then taken out from the coal storage barrel 208 by the disc feeder 209. The coal powder is transported to the coal powder lance 212 by the carrier gas through the coal conveying pipe 211, and the coal powder sprayed from the coal powder lance 212 is injected into the coal powder hot air combustion unit 400. The coal powder is burned after being contacted with the high-temperature combustion-supporting gas in the heat-resistant reaction tube 401. The products after the coal powder is burned are treated by the tail gas treatment unit, and the carbon dioxide, carbon monoxide, methane, hydrogen, and oxygen contents in the tail gas are measured by the gas analyzer 601 and recorded.

[0083] The flow rate of the carrier gas is 1L / min. At the same time, the delivery amount of the coal powder is controlled by the rotating speed of the disc feeder 209, and the rotating speed of the disc feeder 209 is accurately adjusted by the servo motor controller 210. The rotating speed of the disc feeder 209 is 3 revolutions / min, and the coal powder injection amount is 3g / min.

[0084] The process of treating the tail gas specifically includes: The tail gas after the combustion of the pulverized coal is cooled by a tail gas cooler 501 in a tail gas cooling and purification unit 500, and the solid product after cooling is collected in a solid product collector 502 to obtain a sample of unburned pulverized coal for subsequent analysis and testing; the gaseous product is reduced in pressure by a pressure reducer 503 and then enters a dust filter 505 for purification, and the purified tail gas enters a dryer 506 to remove water in the tail gas.

[0085] S4. Calculate the combustion rate of the pulverized coal according to the changes in the contents of carbon dioxide, carbon monoxide, methane, hydrogen and oxygen in the tail gas before and after the injection of the pulverized coal.

[0086] Example 2 The difference between this example 2 and example 1 is that: In step S2, the flow rate of the hydrogen-rich gas is 4 L / min, and the remaining steps and control processes are the same as those of example 1, which will not be repeated here.

[0087] Example 3 The difference between this example 3 and example 1 is that: In step S3, the flow rate of the pulverized coal is 4 g / min, and the remaining steps and control processes are the same as those of example 1, which will not be repeated here.

[0088] According to the analysis of the tail gas components in examples 1-3, the following table 1 shows the detection results of the tail gas components and the combustion rate of the pulverized coal.

[0089] Table 1 Detection results of tail gas components and combustion rate of pulverized coal in examples 1-3

[0090] As can be seen from the results in table 1, both the injection amount of the hydrogen-rich gas and the injection amount of the pulverized coal have a significant effect on the combustion rate of the pulverized coal. Since the reaction between the hydrogen-rich gas and the combustion-supporting gas is a gas-gas combustion reaction, its combustion speed is much higher than the combustion speed between the pulverized coal and the combustion-supporting gas. Therefore, after the injection amount of the hydrogen-rich gas is reduced, the combustion of the hydrogen-rich gas consumes less oxygen in the combustion-supporting gas, which increases the oxygen content in the products after the combustion of the hydrogen-rich gas and the combustion-supporting gas, increases the contact combustion reaction between the pulverized coal and oxygen, speeds up the ignition and combustion process of the pulverized coal, and thus increases the combustion rate of the pulverized coal. At the same time, as the injection amount of the pulverized coal increases, the combustion rate of the pulverized coal decreases, mainly because the increase in the injection amount of the pulverized coal reduces the ratio of oxygen in the combustion-supporting gas to carbon in the pulverized coal, which affects the contact area between the pulverized coal particles and oxygen, and thus reduces the combustion speed, resulting in a decrease in the combustion rate of the pulverized coal.

[0091] The simulation blast furnace coal powder injection combustion rate experiment device and method in the application are convenient to control, have strong adaptability, can meet process condition simulation under different blast furnace combustion operation environments, accurately simulate the combustion behavior of the blast furnace coal powder injection at the front end of the tuyere, and accurately realize the combustion rate determination of the coal powder under different combustion conditions, provide a basis for analyzing the influence of different process control parameters on the blast furnace coal powder injection combustion condition, promote the optimization and application of the blast furnace coal powder injection technology, reduce the production cost of the blast furnace ironmaking, and have excellent economic benefits and popularization value.

[0092] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An experimental device for simulating the combustion rate of pulverized coal injected into a blast furnace, characterized in that, include: A hot blast generating unit; the hot blast generating unit includes a combustion gas distribution system and a heating system, the heating system being used to heat the combustion gas configured in the combustion gas distribution system, thereby simulating the composition, temperature and pressure of blast furnace hot blast; A pulverized coal injection unit; the pulverized coal injection unit includes a carrier gas distribution system, a pulverized coal feeding system and a pulverized coal injection system, wherein the carrier gas distribution system is used to configure the carrier gas and uniformly transport and inject the pulverized coal fed by the pulverized coal feeding system through the pulverized coal injection system. Fuel gas injection unit; the fuel gas injection unit includes a fuel gas distribution system and a fuel gas injection gun, the fuel gas distribution system is used to simulate the configuration of blast furnace fuel gas, and the fuel gas injection gun is used to uniformly inject the fuel gas; The pulverized coal hot blast combustion unit has a combustion chamber that simulates a blast furnace. The hot blast generating unit, the pulverized coal injection system, and the fuel gas injection gun are respectively connected to the combustion chamber to realize the contact combustion of pulverized coal, fuel gas, and combustion-supporting gas, simulating the combustion process of pulverized coal and blast furnace fuel gas injected into the tuyeres. Exhaust gas treatment unit; the exhaust gas treatment unit is connected to the combustion chamber and is used to receive the exhaust gas after combustion and to process and analyze its components. The data processing unit is electrically connected to each of the other units and is used to receive process data and exhaust gas composition data fed back by each unit, and to perform pulverized coal combustion calculations to obtain pulverized coal combustion rate data under different process conditions.

2. The experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace according to claim 1, characterized in that, The exhaust gas treatment unit includes an exhaust gas cooling and purification unit and an exhaust gas analysis unit arranged sequentially. The exhaust gas cooling and purification unit includes an exhaust gas cooler for cooling the combustion products, a solid product collector for collecting solid products in the combustion products, and a pressure reducer, a dust filter and a dryer connected in sequence by pipelines for purifying the cooled exhaust gas. The exhaust gas analysis unit is connected to the dryer and is used to analyze the components in the exhaust gas.

3. The experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace according to claim 1, characterized in that, The combustion chamber is equipped with multiple thermocouples for detecting the temperature at corresponding locations within the combustion chamber, and each thermocouple is electrically connected to the data processing unit. and / or The heating system is a microwave plasma heating system, which includes a microwave coupling cavity and a plurality of microwave magnetrons disposed on the microwave coupling cavity. Each of the microwave magnetrons is connected to the microwave coupling cavity through a transmission waveguide.

4. The experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace according to any one of claims 1 to 3, characterized in that, The combustion-supporting gas distribution system, the carrier gas distribution system, and the fuel gas distribution system all include a mixing cylinder and multiple gas cylinders connected to the mixing cylinder via pipelines.

5. The experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace according to claim 4, characterized in that, The plurality of gas cylinders includes at least one nitrogen cylinder, used to clean the gas mixing cylinder and pipeline by introducing nitrogen into the gas mixing cylinder and pipeline; and / or The mixing cylinder is connected to each of the gas cylinders by a pipeline equipped with a pressure gauge and a flow meter. and / or Each of the aforementioned gas mixing cylinders is equipped with a flow meter on the pipeline connecting to the pulverized coal hot air combustion unit.

6. The experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace according to claim 4, characterized in that, The combustion-supporting gas distribution system includes multiple gas cylinders such as nitrogen cylinders, oxygen cylinders, compressed air cylinders, and carbon dioxide cylinders. and / or The carrier gas distribution system includes multiple gas cylinders, including nitrogen cylinders, compressed air cylinders, and carbon dioxide cylinders. and / or The fuel gas distribution system includes multiple gas cylinders such as nitrogen cylinders, carbon monoxide cylinders, hydrogen cylinders, and methane cylinders.

7. The experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace according to any one of claims 1 to 3, 5, and 6, characterized in that, The pulverized coal feeding system includes a coal storage bin, a disc feeder, and a servo motor controller; the pulverized coal injection system includes a coal conveying pipe and a pulverized coal injection gun. The disc feeder is connected to the outlet of the coal storage bin and is used to take material from the coal storage bin; the servo motor controller is connected to the disc feeder and is used to control the rotation speed of the disc feeder to adjust the coal powder conveying rate; and One end of the disc feeder is connected to the pipeline of the carrier gas distribution system, and the other end is connected to one end of the coal conveying pipe. The other end of the coal conveying pipe is connected to the pulverized coal spray gun. The pulverized coal spray gun is connected to the pulverized coal hot air combustion unit and is used to spray pulverized coal into the combustion chamber.

8. A method for simulating the combustion rate of pulverized coal injected into a blast furnace, characterized in that, This method is implemented using the experimental apparatus for simulating the combustion rate of pulverized coal injected into a blast furnace as described in any one of claims 1 to 7, and includes the following steps: (1) According to the composition and pressure of the combustion-supporting gas in the experimental scheme, the combustion-supporting gas is mixed and heated to simulate the composition, temperature and pressure of the blast furnace hot air; the combustion-supporting gas is accurately metered and then introduced into the pulverized coal hot air combustion unit. (2) According to the composition of the fuel gas in the experimental scheme, the fuel gas is mixed and the fuel gas is accurately measured and then sprayed into the pulverized coal hot air combustion unit by the fuel gas spray gun; the fuel gas is burned after contact with the high temperature combustion-supporting gas, and the components in the exhaust gas after combustion are analyzed and recorded by the exhaust gas treatment unit. (3) According to the parameters of the coal powder carrier gas in the experimental scheme, the carrier gas is mixed and the carrier gas is accurately taken from the coal powder feeding system and injected into the coal powder hot air combustion unit through the coal powder injection system; the coal powder is burned after contact with the high temperature combustion gas and fuel gas, and the components in the exhaust gas after combustion are analyzed and recorded by the exhaust gas treatment unit. (4) Calculate the combustion rate data of pulverized coal based on the changes in the composition of the exhaust gas before and after pulverized coal injection.

9. The experimental method for simulating the combustion rate of pulverized coal injected into a blast furnace according to claim 8, characterized in that, In step (3), the exhaust gas treatment unit collects unburned coal powder samples after coal powder combustion, calculates the coal powder combustion rate by ash balance method, and verifies the coal powder combustion rate data measured in step (4) in this way. and / or The exhaust gas treatment unit analyzes the composition of the exhaust gas, including measuring the content of carbon dioxide, carbon monoxide, methane, hydrogen, and oxygen in the exhaust gas.

10. The experimental method for simulating the combustion rate of pulverized coal injected into a blast furnace according to claim 8 or 9, characterized in that, The flow rate of the combustion-supporting gas into the pulverized coal hot air combustion unit is greater than 5L / min, and the temperature of the combustion-supporting gas is greater than 900℃. and / or The injection flow rate of the fuel gas is greater than 1 L / min; and / or The pulverized coal injection rate is greater than 1 g / min.

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