Combustion optimization adjusting device of hot blast stove

Abstract

The utility model belongs to the technical field of hot-blast stove equipment in iron works, and relates to a hot-blast stove combustion optimization adjusting device which comprises a hot-blast stove, an air inlet pipe is connected to the hot-blast stove, an air inlet pipe and a coal gas inlet pipe are arranged at the tail end of the air inlet pipe, and a flow adjusting valve is arranged on the air inlet pipe. An air adjusting valve and a gas adjusting valve are arranged on the air inlet pipe and the gas inlet pipe respectively, servo motors are arranged on the flow adjusting valve, the air adjusting valve and the gas adjusting valve, rotating shafts are connected to the bottoms of the servo motors, baffles are arranged on the rotating shafts, and the servo motors are connected to a PLC through data lines. Through optimal control over the air-fuel ratio and the flow, it is ensured that the furnace burning process is always in the optimal proportion burning state, gas consumption is reduced, the air supply temperature is increased, and the purposes of low carbon, energy conservation, consumption reduction and cost reduction in the ironmaking process are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hot blast stove equipment technical field of ironworks, specifically related to a hot blast stove combustion optimization adjusting device. BACKGROUND

[0002] The hot blast stove is cycled in three states of burning, stewing and air supply. When the hot blast stove enters the burning state, the gas quantity fluctuates due to the difference in experience of the operators, and it is difficult to realize the reasonable use of gas. When the hot blast stove enters the burning state, the air-fuel ratio, gas quantity and air quantity are manually set according to the experience of the operators to control the dome temperature and waste gas temperature, and it is difficult to control the reasonable amount and ratio of gas and air, so that the dome temperature and waste gas temperature reach the requirements of 1350 DEG C and 390 DEG C.

[0003] When the furnace is burned by manual experience, the burning ratio is often unreasonable, which causes the dome high temperature, low temperature and different burning time, and the waste gas quantity is too large. Not only a large amount of energy is wasted, but also the service life and production safety of the hot blast stove are affected. Therefore, a hot blast stove combustion optimization adjusting device is provided. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a kind of hot blast stove combustion optimization adjusting devices, with hot blast stove combustion optimization adjusting function, solve the problem that the furnace is burned by manual experience in prior art and leads to unreasonable burning ratio, which causes the dome high temperature, low temperature and different burning time, and the waste gas quantity is too large.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme, and provides a kind of hot blast stove combustion optimization adjusting device, including hot blast stove, the air inlet pipe is connected on the hot blast stove, air inlet pipe end is provided with air inlet pipe and gas inlet pipe, flow regulating valve is provided on air inlet pipe, air regulating valve and gas regulating valve are respectively provided on air inlet pipe and gas inlet pipe, servo motor is provided on flow regulating valve, air regulating valve and gas regulating valve, servo motor bottom is connected with rotating shaft, baffle is provided on rotating shaft, servo motor is connected to PLC by data line.

[0006] As preferred, the air inlet pipe, air inlet pipe and gas inlet pipe are connected by a tee joint, and the air inlet pipe, air inlet pipe and gas inlet pipe are connected in a Y shape.

[0007] As preferred, the air inlet pipe, air inlet pipe and gas inlet pipe are all double-layer structures, the outer layer is high-temperature-resistant stainless steel, and the inner layer is coated with a silicon carbide ceramic coating with a thickness of 0.5-1.2 mm.

[0008] Preferably, the hot air furnace is equipped with a ring-shaped temperature sensor array at the top, a pressure sensor is embedded in the middle of the air inlet pipe, and a gas composition analyzer is installed inside the air inlet pipe and the gas inlet pipe.

[0009] Preferably, the temperature sensor, pressure sensor, and gas composition analyzer are all connected to the PLC signal.

[0010] Preferably, the baffle is a circular plate, with a rotating shaft connecting the top of the baffle, and a servo motor driving the baffle to rotate within a range of 0-90°.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. This utility model ensures that the furnace combustion process is always in the optimal ratio combustion state by optimizing the air-fuel ratio and flow rate, thereby reducing gas consumption and increasing the air supply temperature, and achieving the goal of low carbon and energy saving, and cost reduction in the ironmaking process.

[0013] 2. This utility model has a hot air furnace combustion optimization and adjustment function, which solves the problem that the existing technology relies on manual experience to start the furnace, resulting in unreasonable furnace ratio, which leads to inconsistent high and low temperatures at the dome and inconsistent furnace firing time, and excessive exhaust gas volume. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Fig. 1 This is a three-dimensional structural diagram of a hot blast stove combustion optimization and adjustment device according to one embodiment;

[0016] Fig. 2 This is a three-dimensional structural view of a hot blast stove combustion optimization and adjustment device according to one embodiment, taken from other angles.

[0017] In the above diagrams, 1. Hot air furnace, 2. Inlet pipe, 3. Air inlet pipe, 4. Gas inlet pipe, 5. Flow regulating valve, 6. Air regulating valve, 7. Gas regulating valve, 8. Servo motor, 9. Baffle, 10. Data cable, 11. PLC. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example 1, such as Figs. 1-2 As shown, a combustion optimization and adjustment device for a hot blast stove 1 includes a hot blast stove 1, which is the core combustion vessel responsible for mixing and burning coal gas and air to provide stable high-temperature hot air for the blast furnace, directly participating in combustion optimization, and ensuring that the heat output meets process requirements. An air inlet pipe 2 is connected to the hot blast stove 1, which transports air and coal gas to the hot blast stove 1.

[0021] The air inlet pipe 2 is equipped with an air inlet pipe 3 and a gas inlet pipe 4 at its end, which respectively supply air and gas, featuring a dual-path independent regulation design. A flow regulating valve 5 is installed on the air inlet pipe 2 to control the total gas flow rate. An air regulating valve 6 and a gas regulating valve 7 are respectively installed on the air inlet pipe 3 and gas inlet pipe 4, controlling the flow rate ratio within their respective pipes.

[0022] Servo motors 8 are installed on flow regulating valve 5, air regulating valve 6, and gas regulating valve 7. A rotating shaft is connected to the bottom of servo motor 8, and a baffle 9 is installed on the rotating shaft. Servo motor 8 drives the rotating shaft to rotate the baffle 9, adjusting the valve opening. Servo motor 8 provides precise angle control, enabling fine-tuning of flow. Servo motor 8 is connected to PLC 11 via data cable 10. PLC 11 receives sensor data and dynamically adjusts the valve opening using a PID algorithm, achieving closed-loop control. Data cable 10 transmits data and sends control commands from PLC 11 to servo motor 8. Data cable 10 uses industrial-grade shielded cable to resist electromagnetic interference.

[0023] The specific design of the aforementioned key components will be discussed in detail below:

[0024] The air inlet pipe 2 is connected to the air inlet pipe 3 and the gas inlet pipe 4 via a tee, forming a Y-shape. The inner diameter ratio of the air pipe to the gas pipe is 1:1.2, for example, the air pipe is DN200 and the gas pipe is DN240, adapting to different gas flow rate requirements, preferably an air flow rate of 8-12 m / s and a gas flow rate of 6-10 m / s. Preferably, a static mixer is installed 1 m downstream of the air inlet pipe 2 to achieve a 98% uniformity of air-gas mixing.

[0025] The air inlet pipe 2, air inlet pipe 3 and gas inlet pipe 4 all adopt a double-layer structure, with the outer layer being high-temperature resistant stainless steel and the inner layer being coated with a silicon carbide ceramic coating with a thickness of 0.5-1.2mm.

[0026] The hot blast stove 1 is equipped with a ring-shaped temperature sensor array at its top, a pressure sensor is embedded in the middle of the air inlet pipe 2, and gas composition analyzers are installed inside the air inlet pipe 3 and the gas inlet pipe 4. Eight K-type thermocouples are embedded in the refractory layer of the hot blast stove 1 arch, evenly distributed in a 45° ring, with a depth of 50 mm, a detection range of 0-1500℃, and an accuracy of ±1.5℃. A weighted average algorithm is used to process the temperature data at the eight points to identify local overheating.

[0027] The pressure sensor is a piezoelectric sensor, installed in the middle straight section of the air inlet pipe 2. The gas composition analyzer inserts multi-channel probes into the air inlet pipe 3 and the gas inlet pipe 4, using non-dispersive infrared (NDIR) technology to detect CO2 and O2, and an electrochemical sensor to detect CO.

[0028] The temperature sensor, pressure sensor, and gas composition analyzer are all connected to the PLC11. The PLC11 is a Siemens S7-1500 series, configured with AI and AO modules. The signal cables are shielded twisted-pair cables with single-end grounding of the shielding layer, and are EMC III compliant with electromagnetic interference protection.

[0029] The theoretical air-fuel ratio is calculated based on the preset calorific value of the gas. For example, for high-calorific-value gas, the ratio is set to 2.3:1. The opening of the air regulating valve 6 and the gas regulating valve 7 is adjusted by PID control. When the average temperature of the ring sensor is >1350℃, PLC11 closes the gas valve at a rate of 0.5% / s. If the temperature is <1300℃, the opening of the air valve is increased first. At the same time, the historical best combustion parameters are stored for rapid matching under similar working conditions.

[0030] The baffle 9 is a circular plate, with a rotating shaft connecting its top. The servo motor 8 drives the baffle 9 to rotate within a range of 0-90°. The baffle 9 is made of Hastelloy C276 alloy with a tungsten carbide coating. The flow rate curve corresponding to the 0-90° rotation angle of the baffle 9 exhibits an equal percentage characteristic; for example, at a 50° opening, the flow rate is 65% of the fully open flow. The servo motor 8 is a Panasonic MINAS A6 series, with a double-lip fluororubber oil seal at the motor shaft end, providing an IP67 protection rating.

[0031] Collaborative work examples

[0032] When the hot blast stove 1 enters the combustion stage, PLC11, based on preset parameters, opens the air regulating valve 6 to 30%, the gas valve to 25%, and the flow regulating valve 5 to full opening. The ring sensor detects the dome temperature. If it does not reach 1200℃ within 10 minutes, PLC11 activates the fuzzy PID algorithm to gradually increase the opening of the gas regulating valve 7. When the dome temperature reaches 1350℃ and the exhaust gas temperature stabilizes at 390℃, the gas analyzer reports O2 = 3.1%. PLC11 fine-tunes the air-fuel ratio to 2.35:1 and records the optimal parameters for this operating condition. If the pressure sensor detects a sudden drop of 0.2MPa in the pipeline pressure, PLC11 immediately closes the gas valve to prevent backfire.

[0033] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A hot blast stove combustion optimization regulating device, characterized in that, The hot blast stove is provided with an air inlet pipe connected with an air inlet pipe and a gas inlet pipe, a flow regulating valve, an air regulating valve and a gas regulating valve, a servo motor, a rotating shaft, a baffle and a PLC.

2. A hot blast stove combustion optimization regulating device according to claim 1, characterized in that, The air inlet pipe, the air inlet pipe and the gas inlet pipe are connected in Y shape through a tee joint.

3. A hot blast stove combustion optimization regulating device according to claim 1, characterized in that, The air inlet pipe, the air inlet pipe and the gas inlet pipe are all double-layer structures, the outer layer is high-temperature-resistant stainless steel, and the inner layer is coated with a silicon carbide ceramic coating with a thickness of 0.5-1.2 mm.

4. A hot blast stove combustion optimization regulating device according to claim 1, characterized in that, The hot blast stove is provided with an air inlet pipe connected with an air inlet pipe and a gas inlet pipe, a flow regulating valve, an air regulating valve and a gas regulating valve, a servo motor, a rotating shaft, a baffle and a PLC.

5. A hot blast stove combustion optimizing regulating device as claimed in claim 4, wherein, The temperature sensor, the pressure sensor and the gas component analyzer are all connected with the PLC.

6. A hot blast stove combustion optimization regulating device according to claim 1, characterized in that, The baffle is a circular plate, the rotating shaft is connected to the top of the baffle, and the rotating angle range of the baffle driven by the servo motor is 0-90°.

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