A combustion characteristic testing system and method for an external combustion hot blast stove burner

Abstract

This invention relates to a combustion characteristic testing system and method for an externally combusted hot blast stove burner. The testing system is scaled to the size of an externally combusted hot blast stove and includes a combustion chamber, a connecting pipe, and a regenerator chamber. The combustion chamber includes a burner, a combustion chamber shaft, and a combustion chamber dome. The connecting pipe connects the combustion chamber and the regenerator chamber. The regenerator chamber includes a regenerator dome and a regenerator shaft. A regenerator is installed in the regenerator shaft, which simulates the flue gas flow field above the regenerator in the hot blast stove's regenerator chamber. Cooling pipes are installed in the combustion chamber, connecting pipe, and regenerator chamber. A flame observation hole and a detection hole are provided on the combustion chamber dome. A middle detection hole and an outlet detection hole are respectively provided at the horizontal connection point between the connecting pipe and the regenerator dome. Multiple regenerator shaft detection holes are provided in the regenerator shaft. This invention comprehensively considers the application scenarios of externally combusted hot blast stoves and the specific combustion characteristics of burners, enabling comprehensive and systematic testing of the combustion performance of top-fired hot blast stoves.

Description

Technical Field

[0001] This invention relates to the field of burner combustion characteristic testing technology, and more particularly to a system and method for testing the combustion characteristics of an external combustion hot blast stove burner. Background Technology

[0002] Hot blast stoves are crucial facilities in blast furnace ironmaking, providing a continuous supply of high-temperature hot blast to the blast furnace. Modern blast furnaces typically have hot blast temperatures reaching 1200℃. To ensure a stable supply of hot blast, each blast furnace requires three to four hot blast stoves. Extending blast furnace lifespan is an important research direction, aiming for continuous operation for 12-15 years. This extended lifespan places higher demands on the stability of the hot blast stove process and equipment. The burner is one of the core components of the hot blast stove, and its combustion characteristics directly affect the quality of the hot blast and the smooth operation of the blast furnace. Testing the performance of the hot blast stove burner is an effective technical means to ensure the reliable operation of the hot blast stove.

[0003] Existing technologies for testing the performance of hot blast stove burners, such as patent CN114894302A, which describes a visual flame auxiliary detection device and a visual flame detection system, enable the simultaneous detection of the flame inside the burner using a flame detection probe and a video camera without altering the installation position of the existing flame observation hole. This invention is beneficial for flame observation and plays a positive role in combustion observation. However, for a complete combustion device, performance testing and analysis involves more than just testing the flame shape. A systematic evaluation of the composition of combustion products, the temperature distribution of combustion products, and the burner's application scenario is necessary to obtain scientific and accurate results. For example, regardless of the flame distribution of a household gas stove burner, it is inadvisable to directly apply it to a power generation boiler. Furthermore, it should be noted that under certain operating conditions, the flame shape is not observable, meaning the flame is not visible. Therefore, evaluating burner performance by merely observing the combustion flame is clearly insufficient.

[0004] Patent CN113587868A, disclosing a burner detection system and method based on image analysis, includes a wall thickness distribution acquisition module, a pre-detection analysis module, a detection result output module, and a flame test analysis module. When testing burners using this invention, the wall thickness is first determined to meet requirements before flame detection. This invention shows some promise in burner detection. However, it lacks a systematic approach to combustion device performance testing, relying solely on the shape of the burner flame and neglecting other characteristics of the combustion device. Furthermore, this method cannot detect the flame when it is not visible.

[0005] Patent CN210427044U discloses a burner testing platform system, which includes a casing, burner body, fixing block, and purification chamber. This system can detect key parameters such as burner thermal power, pollutant emissions, combustion efficiency, fuel flow rate, air flow rate, furnace pressure, and exhaust temperature. However, this solution is only applicable to burners with power ratings in the range of 2.8–4.2 MW, and cannot use a single testing platform and method to test all burners. Furthermore, this novel technical solution lacks consideration for the application scenarios of the burners. For example, exhaust temperature detection is related to both the burner and the application scenario; in conventional steel rolling mills, the exhaust temperature differs significantly between cold and hot billets.

[0006] In conclusion, performance testing of combustion devices requires a systematic consideration of the device's technical characteristics and practical application scenarios; a single testing system cannot be used to test the performance of all combustion devices. As a key auxiliary device in blast furnaces, the combustion performance of externally combusted hot blast stoves directly affects the furnace's production operation. Current technology lacks scientifically effective methods for evaluating the combustion performance of externally combusted hot blast stoves. Summary of the Invention

[0007] In response to the aforementioned technical problems, a combustion characteristic detection system and method for an external combustion hot blast stove burner are provided.

[0008] The technical means employed in this invention are as follows:

[0009] This invention discloses a combustion characteristic detection system for an external combustion hot blast stove burner, which is proportional to an external combustion hot blast stove and includes a combustion chamber, a connecting pipe, and a heat storage chamber connected in sequence.

[0010] The combustion chamber includes a space formed by a burner arranged from bottom to top, a combustion chamber shaft, and a combustion chamber dome;

[0011] The connecting pipe is used to connect the combustion chamber and the heat storage chamber;

[0012] The heat storage chamber includes a space formed by a heat storage chamber dome and a heat storage chamber shaft arranged from top to bottom; a heat storage body is installed in the heat storage chamber shaft, and the heat storage chamber shaft is used to simulate the flue gas flow field above the heat storage body in the hot blast stove heat storage chamber;

[0013] Cooling pipes are provided in the combustion chamber, connecting pipe and heat storage chamber;

[0014] The combustion chamber dome is provided with multiple flame observation holes and multiple combustion chamber dome detection holes. The flame observation holes are located below the center line of the connecting pipe. The combustion chamber dome detection holes are located above the center line of the connecting pipe. Multiple connecting pipe middle detection holes and connecting pipe outlet detection holes are respectively provided at the horizontal connection between the connecting pipe and the regenerator dome. The regenerator shaft is provided with multiple regenerator shaft detection holes, which are located below the bottom of the regenerator dome.

[0015] Furthermore, the outer shells of the combustion chamber, connecting pipe, and heat storage chamber are detachable steel plates.

[0016] Furthermore, heat-resistant fibers are provided between the water-cooling pipe and the outer shell of each chamber.

[0017] Furthermore, multiple flame observation holes are evenly distributed on the bottom circumference of the combustion chamber dome; multiple combustion chamber dome detection holes are evenly distributed on the horizontal circumference; and multiple regenerator shaft detection holes are evenly distributed in the circumferential direction.

[0018] Furthermore, the detection hole of the heat storage chamber shaft is located within a range of 2000mm to 2500mm below the bottom of the heat storage chamber dome.

[0019] Furthermore, it also includes: air flow and pressure measuring instruments installed on the burner air inlet duct, and an anemometer installed at the burner outlet.

[0020] Furthermore, it also includes: air flow and pressure measuring instruments installed on the gas inlet pipe of the burner, and an anemometer installed at the burner outlet.

[0021] The present invention also discloses a method for detecting the combustion characteristics of an external combustion hot blast stove burner, which is applied to the above-mentioned external combustion hot blast stove burner combustion characteristic detection system. The detection method includes: cold state test and hot state test of the burner.

[0022] The cold-state test includes: burner air cold-state test and gas cold-state test; the air cold-state test includes: introducing air according to the burner air flow rate and pressure requirements, reading the flow rate and pressure at the burner air inlet, and simultaneously reading the anemometer reading at the burner air outlet; the gas cold-state test includes: replacing blast furnace gas with air, introducing air according to the burner blast furnace gas flow rate and pressure requirements, reading the flow rate and pressure at the burner gas inlet, and simultaneously reading the anemometer reading at the burner gas outlet;

[0023] The hot-state tests include: low-temperature tests and hot blast stove normal operating temperature tests; the low-temperature tests include: starting the water cooling system, filling the water cooling pipes of the combustion chamber, connecting pipes, and regenerator with cooling water, and circulating it to make the internal temperature of the test device lower than the preset value; safely igniting the burner and observing the flame morphology through the flame observation hole; extracting flue gas samples through the detection hole at the top of the combustion chamber, the detection hole in the middle of the connecting pipe, and the detection hole at the outlet of the connecting pipe, and analyzing the components of each flue gas sample; measuring the flue gas velocity through the detection hole in the regenerator shaft.

[0024] The components of each flue gas sample were analyzed. Specifically, to ensure that the CO concentration in the flue gas at each sampling point is below 1000 ppm and to ensure that the coal gas is fully combusted, NOx was also analyzed.

[0025] The normal operating temperature test process for hot blast furnaces is based on low-temperature test and cold-state test processes.

[0026] Furthermore, it also includes: the normal operating temperature test process based on the low-temperature test process includes: after all the test contents of the low-temperature test process are completed, the cooling water circulation water in the water-cooled pipes in the combustion chamber, connecting pipe and heat storage chamber is stopped and drained, the combustion chamber, connecting pipe and heat storage chamber are heated, and the test begins when the arch temperature reaches the preset temperature. Flue gas samples are extracted through the detection holes in the middle of the connecting pipe, the detection holes at the outlet of the connecting pipe and the detection holes at the top of the combustion chamber, and the components of each flue gas sample are analyzed; the flue gas velocity is measured through the detection holes in the vertical shaft of the heat storage chamber.

[0027] The normal operating temperature test process based on cold-state testing includes: safely igniting the burner, and after the dome temperature reaches the preset temperature, conducting the test according to the test method based on low-temperature testing.

[0028] Furthermore, the formula for calculating the air velocity at the burner inlet is:

[0029]

[0030] Where V1 is the burner inlet air velocity in meters per second, m is the burner inlet air volumetric flow rate in cubic meters per second, and s is the cross-sectional area of ​​the burner inlet air duct.

[0031] The formula for calculating the pressure of the air at the burner outlet is:

[0032]

[0033] Where p1 is the burner inlet air pressure in Pa, p2 is the burner outlet air pressure in Pa, and V2 is the burner outlet air pressure in meters per second.

[0034] Furthermore, the test scheme includes maximum value, minimum value, and normal value.

[0035] Advantages and positive effects of the present invention:

[0036] This invention, taking into account the technological characteristics of externally combusted hot blast stoves, establishes a scientific proportional externally combusted hot blast stove testing system, which rationally defines the flame combustion position and detects the gas and air pressure of the burner to ensure that the gas and air pressure meet the design requirements.

[0037] The technical method of this invention enables comprehensive and systematic testing of the combustion performance of externally fired hot blast stoves. It allows for the improvement of burners that do not meet performance requirements, ensuring stable operation of the hot blast stove and providing stable high-temperature hot air to the blast furnace. Furthermore, this invention can also serve as a reference for testing the combustion performance of burners with upward-propagating flames. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a combustion characteristic detection system for a top-fired hot blast stove burner according to an embodiment of the present invention;

[0040] In the diagram, 1. Burner air and gas inlet; 2. Burner; 3. Combustion chamber shaft; 4. Water-cooled pipe; 5. Flame observation hole; 6. Combustion chamber dome inspection hole; 7. Connecting pipe; 8. Connecting pipe middle inspection hole; 9. Connecting pipe outlet inspection hole; 10. Regenerator inspection hole; 11. Regenerator shaft; 12. Detection system exhaust port. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0048] like Figure 1 As shown, the present invention discloses a combustion characteristic detection system for an external combustion hot blast stove burner, which is proportional to an external combustion hot blast stove and includes a combustion chamber, a connecting pipe and a heat storage chamber connected in sequence.

[0049] The combustion chamber includes a space formed by a burner arranged from bottom to top, a combustion chamber shaft, and a combustion chamber dome;

[0050] The connecting pipe is used to connect the combustion chamber and the heat storage chamber;

[0051] The heat storage chamber includes a space formed by a heat storage chamber dome and a heat storage chamber shaft arranged from top to bottom; a heat storage body is installed in the heat storage chamber shaft, and the heat storage chamber shaft is used to simulate the flue gas flow field above the heat storage body in the hot blast stove heat storage chamber;

[0052] Cooling pipes are provided in the combustion chamber, connecting pipe and heat storage chamber;

[0053] The combustion chamber dome is provided with multiple flame observation holes and multiple combustion chamber dome detection holes. The flame observation holes are located below the center line of the connecting pipe. The combustion chamber dome detection holes are located above the center line of the connecting pipe. Multiple connecting pipe middle detection holes and connecting pipe outlet detection holes are respectively provided at the horizontal connection between the connecting pipe and the regenerator dome. The regenerator shaft is provided with multiple regenerator shaft detection holes, which are located below the bottom of the regenerator dome.

[0054] Multiple flame observation holes are evenly distributed on the bottom circumference of the combustion chamber dome; multiple combustion chamber dome detection holes are evenly distributed on the horizontal circumference; and multiple regenerator shaft detection holes are evenly distributed in the circumferential direction. Specifically, in this embodiment, the arch is provided with 3 flame observation holes and 12 combustion chamber arch detection holes. The number of flame observation holes and combustion chamber arch detection holes can also be other. The flame observation holes are installed below the center line of the connecting pipe, and the detection holes are installed above the center line of the connecting pipe. The flame observation holes are square, and their size is preferably such that the entire arch area can be observed. The preferred size is 500mm×500mm. The 3 flame observation holes and the center line of the connecting pipe are evenly distributed on the circumference of the arch base. The detection holes are arranged in 2 layers. The first layer is on the circumference of 1 / 4 height of the arch, with a total of 4 measuring points, evenly distributed on the horizontal surface of the circumference. The second layer is on the circumference of 1 / 2 height of the arch, with a total of 8 measuring points, evenly distributed on the horizontal surface of the circumference. When the number of flame observation holes and combustion chamber arch detection holes is other, it is preferred that they are also arranged in a uniform distribution manner.

[0055] In this embodiment, the combustion chamber dome and the regenerator dome mentioned are arched top covers with a preset curvature, and the combustion chamber shaft and the regenerator shaft are both cylindrical.

[0056] As an optional implementation, a manhole is provided below the burner for cold-state inspection installation and disassembly of the burner.

[0057] In this embodiment, three detection holes are provided at the horizontal half position of the connecting pipe and at the connection with the dome of the heat storage chamber. The detection holes are located at the top, one at the top, and one at the half height on each side, with the detection holes symmetrically distributed on both sides.

[0058] The outer shells of the combustion chamber, connecting pipe, and regenerator are made of detachable steel plates.

[0059] Heat-resistant fibers are provided between the water-cooled pipes and the outer shell of each chamber.

[0060] The detection holes for the thermal regenerator shaft are located within a range of 2000mm to 2500mm below the bottom of the thermal regenerator arch. There are eight detection holes in total, evenly distributed along the circumference.

[0061] To facilitate air fluid testing, it also includes: air flow and pressure measuring instruments installed on the burner air inlet pipe, and an anemometer installed at the burner outlet.

[0062] To facilitate gas flow testing, the system also includes: air flow and pressure measuring instruments installed on the gas inlet pipe of the burner, and an anemometer installed at the burner outlet.

[0063] The present invention also discloses a method for detecting the combustion characteristics of an external combustion hot blast stove burner, which is applied to the above-mentioned external combustion hot blast stove burner combustion characteristic detection system. The detection method includes: cold state test and hot state test of the burner.

[0064] The cold-state test includes: burner air cold-state test and gas cold-state test; the air cold-state test includes: introducing air according to the burner air flow rate and pressure requirements, reading the flow rate and pressure at the burner air inlet, and simultaneously reading the anemometer reading at the burner air outlet; the gas cold-state test includes: replacing blast furnace gas with air, introducing air according to the burner blast furnace gas flow rate and pressure requirements, reading the flow rate and pressure at the burner gas inlet, and simultaneously reading the anemometer reading at the burner gas outlet;

[0065] The cold-state test process using the calculation scheme of the present invention should cover the pressure and flow range of all gas and air in the burner. The preferred test scheme includes the maximum value, minimum value and normal value, and other test values ​​may also be added.

[0066] The cold-state testing method using the calculation scheme of this invention can test the changes in gas and air pressure and flow rate at any position in the gas and air channels of the burner.

[0067] The hot-state test includes: low-temperature test and hot air furnace normal operating temperature test; the low-temperature test includes: starting the water cooling system, filling the water cooling pipes of the combustion chamber, connecting pipe and heat storage chamber with cooling water, and circulating it so that the internal temperature of the test device is lower than the preset value, which is 700°C in this embodiment; safely igniting the burner, at which time the flame in the test system is visible to the naked eye, observing the shape of the flame through the flame observation hole, visually estimating that the flame can approach or reach the top of the combustion chamber, extracting flue gas samples through the detection hole at the top of the combustion chamber, the detection hole in the middle of the connecting pipe and the detection hole at the outlet of the connecting pipe, analyzing the components of each flue gas sample, the sampling range of the flue gas sample at the top of the top is within 500mm of the inner surface of the top of the top; measuring the flue gas velocity through the detection hole of the heat storage chamber shaft;

[0068] In this embodiment, the flue gas sampling of the connecting pipe should cover the cross-section of the connecting pipe. Specifically, the side hole sampling is performed at 1 / 2 length, 1 / 4 length, 1 / 8 length and 0 starting position in the horizontal direction. Other sampling methods are also allowed. The top detection holes are located at the bottom of the connecting pipe, 1 / 8 height, 1 / 4 height, 1 / 2 height, 3 / 4 height, 7 / 8 height and the entrance of the detection hole.

[0069] The components of each flue gas sample were analyzed. Specifically, to ensure that the CO concentration in the flue gas at each sampling point is below 1000 ppm and to ensure that the coal gas is fully combusted, NOx was also analyzed.

[0070] The flue gas velocity is measured at the same sampling location through the detection hole of the connecting pipe; the flue gas velocity is also measured through the detection hole above the heat storage chamber. The measurement point selection methods are: horizontal measurement point inlet, 1 / 8 length, 1 / 4 length, 1 / 2 length, or other sampling methods. The velocity deviation shall not exceed 10%.

[0071] The normal operating temperature test process for hot blast furnaces is based on low-temperature test and cold-state test processes.

[0072] It also includes: the normal operating temperature test process based on the low temperature test process, which includes: after all the test contents of the low temperature test process are completed, the cooling water circulation water in the water-cooled pipes arranged in the combustion chamber, connecting pipe and heat storage chamber is stopped and drained, the combustion chamber, connecting pipe and heat storage chamber are heated, and the test begins when the temperature of the arch reaches the preset temperature, which is 1400℃ in this embodiment. Flue gas samples are extracted through the detection hole in the middle of the connecting pipe, the detection hole at the outlet of the connecting pipe and the detection hole at the top of the combustion chamber. The sampling range of the flue gas sample at the top is within 500mm of the inner surface of the arch. The components of each flue gas sample are analyzed; the flue gas velocity is measured through the detection hole in the vertical shaft of the heat storage chamber.

[0073] In this embodiment, the flue gas sampling of the connecting pipe should cover the cross-section of the connecting pipe. Specifically, the side hole sampling is performed at 1 / 2 length, 1 / 4 length, 1 / 8 length and 0 starting position in the horizontal direction. Other sampling methods are also allowed. The top detection holes are located at the bottom of the connecting pipe, 1 / 8 height, 1 / 4 height, 1 / 2 height, 3 / 4 height, 7 / 8 height and the entrance of the detection hole.

[0074] Other sampling methods can also be used to analyze the components of each flue gas sample. To ensure complete combustion of the coal gas, the CO concentration in the flue gas at each sampling point is below 1000ppm. Other components of the flue gas, such as NOx, can also be analyzed. The flue gas velocity can be measured at the same flue gas sampling location through the detection hole of the connecting pipe. The flue gas velocity can also be measured through the detection hole above the heat storage chamber. The measurement point selection methods are: horizontal measurement point inlet, 1 / 8 length, 1 / 4 length, and 1 / 2 length. Other sampling methods can also be used, with a velocity deviation not exceeding 10%.

[0075] The normal operating temperature test process based on cold-state testing includes: safely igniting the burner, and when the dome temperature reaches the preset temperature, i.e., 1400℃ as mentioned above, conducting the test according to the test method based on the low-temperature test process.

[0076] The formula for calculating the air velocity at the burner inlet is:

[0077]

[0078] Where V1 is the burner inlet air velocity in meters per second, m is the burner inlet air volumetric flow rate in cubic meters per second, and s is the cross-sectional area of ​​the burner inlet air duct.

[0079] The formula for calculating the pressure of the air at the burner outlet is:

[0080]

[0081] Where p1 is the burner inlet air pressure in Pa, p2 is the burner outlet air pressure in Pa, and V2 is the burner outlet air pressure in meters per second.

[0082] Furthermore, the test scheme includes maximum value, minimum value, and normal value.

[0083] The test results meet the requirements of this invention and the hot blast stove design, and the tested burner meets the requirements of an external combustion hot blast stove.

[0084] This invention, taking into account the technological characteristics of top-fired hot blast stoves, establishes a scientific proportional testing system for top-fired hot blast stoves, rationally defining the flame combustion position; and detecting the gas and air pressure of the burner to ensure that the gas and air pressure meet the design requirements.

[0085] This invention enables simultaneous detection of both visible and invisible flame states by altering cooling conditions, ensuring that the burner completes combustion within a reliable combustion zone; it ensures uniform distribution of combustion products by identifying key flow field test points, guaranteeing efficient heat transfer between combustion products and checker bricks; and it analyzes and judges the combustion components of hot blast stove products under different fuel conditions to ensure complete combustion in the burner process.

[0086] The technical method of this invention allows for comprehensive and systematic testing of the combustion performance of top-fired hot blast stoves. Burners that do not meet performance requirements can be improved, ensuring stable operation of the hot blast stove and providing stable high-temperature hot air to the blast furnace. Furthermore, this invention can also serve as a reference for testing the combustion performance of burners with downward-propagating flames.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting the combustion characteristics of an externally combusted hot blast stove burner, characterized in that, An external combustion hot blast stove burner combustion characteristic detection system is applied, wherein the external combustion hot blast stove burner combustion characteristic detection system is proportional to the external combustion hot blast stove and includes a combustion chamber, a connecting pipe and a heat storage chamber connected in sequence. The combustion chamber includes a space formed by a burner arranged from bottom to top, a combustion chamber shaft, and a combustion chamber dome; The connecting pipe is used to connect the combustion chamber and the heat storage chamber; The heat storage chamber includes a space formed by a heat storage chamber dome and a heat storage chamber shaft arranged from top to bottom; a heat storage body is installed in the heat storage chamber shaft, and the heat storage chamber shaft is used to simulate the flue gas flow field above the heat storage body in the hot blast stove heat storage chamber; Water-cooled pipes are installed in the combustion chamber, connecting pipe and heat storage chamber; The combustion chamber dome is provided with multiple flame observation holes and multiple combustion chamber dome detection holes. The flame observation holes are located below the center line of the connecting pipe. The combustion chamber dome detection holes are located above the center line of the connecting pipe. Multiple connecting pipe middle detection holes and connecting pipe outlet detection holes are respectively provided at the horizontal connection point between the connecting pipe and the regenerator dome. The regenerator shaft is provided with multiple regenerator shaft detection holes, which are located below the bottom of the regenerator dome. The detection method includes: cold-state testing and hot-state testing of the burner; The cold-state test includes: burner air cold-state test and gas cold-state test; The cold air test includes: introducing air according to the burner air flow and pressure requirements, reading the flow and pressure at the burner air inlet, and simultaneously reading the anemometer reading at the burner air outlet; The cold test of the gas includes: replacing the blast furnace gas with air, introducing air according to the blast furnace gas flow and pressure requirements of the burner, reading the flow and pressure at the gas inlet of the burner, and simultaneously reading the anemometer reading at the gas outlet of the burner; The thermal tests include: low-temperature tests and hot air furnace normal operating temperature tests; The low-temperature test includes: starting the water cooling system, filling the water cooling pipes of the combustion chamber, connecting pipe and heat storage chamber with cooling water, and circulating it so that the temperature inside the test device is lower than the preset value; The burner is safely ignited, and the flame morphology is observed through the flame observation hole; flue gas samples are extracted through the detection holes on the combustion chamber dome, the middle detection hole of the connecting pipe, and the outlet detection hole of the connecting pipe, and the components of each flue gas sample are analyzed; the flue gas velocity is measured through the detection hole of the regenerator shaft. The components of each flue gas sample were analyzed. Specifically, to ensure that the CO concentration in the flue gas at each sampling point was below 1000 ppm, NOx was analyzed. The normal operating temperature test process for hot blast stoves is based on low-temperature test process and cold-state test process.

2. The method according to claim 1, characterized in that, The outer shells of the combustion chamber, connecting pipe, and regenerator are made of detachable steel plates.

3. The method according to claim 1, characterized in that, Heat-resistant fibers are provided between the water-cooled pipes and the outer shell of each chamber.

4. The method according to claim 1, characterized in that, Multiple flame observation holes are evenly distributed on the bottom circumference of the combustion chamber dome; multiple combustion chamber dome detection holes are evenly distributed on the horizontal circumference; and multiple regenerator shaft detection holes are evenly distributed in the circumferential direction.

5. The method according to claim 1, characterized in that, The detection hole of the thermal storage chamber shaft is located within a range of 2000mm to 2500mm below the bottom of the thermal storage chamber arch.

6. The method according to claim 1, characterized in that, Also includes: Air flow and pressure measuring instruments are installed on the air inlet pipe of the burner, and an anemometer is installed at the burner outlet.

7. The method according to claim 1, characterized in that, Also includes: Air flow and pressure measuring instruments are installed on the gas inlet pipe of the burner, and an anemometer is installed at the burner outlet.

8. The method according to claim 1, characterized in that, Also includes: The normal operating temperature test process based on the low-temperature test process includes: after all the test contents of the low-temperature test process are completed, the cooling water circulation water in the water-cooled pipes in the combustion chamber, connecting pipe and heat storage chamber is stopped and drained; the combustion chamber, connecting pipe and heat storage chamber are heated; when the temperature of the dome reaches the preset temperature, the test begins; flue gas samples are extracted through the detection holes in the middle and outlet of the connecting pipe and the detection hole at the top of the combustion chamber, and the components of each flue gas sample are analyzed; the flue gas velocity is measured through the detection hole in the vertical shaft of the heat storage chamber. The normal operating temperature test process based on cold-state testing includes: safely igniting the burner, and then conducting the test according to the test method based on low-temperature testing after the dome temperature reaches the preset temperature.

9. The method according to claim 1, characterized in that, The formula for calculating the air velocity at the burner inlet is: ； in, is the air velocity at the burner inlet, in meters per second; m is the volumetric air flow rate at the burner inlet, in cubic meters per second; s is the cross-sectional area of ​​the air duct at the burner inlet. The formula for calculating the pressure of the air at the burner outlet is: ； in, This refers to the burner inlet air pressure, expressed in Pa. This refers to the burner outlet air pressure, expressed in Pa. The air velocity at the burner outlet is expressed in meters per second.

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