Gas pressure stabilization control device for blast furnace coal injection and pulverizing system
The gas pressure stabilization control device with multi-valve regulation and carbon monoxide monitoring solves the problem of unstable gas in the blast furnace pulverized coal injection system, realizes precise control of flow and pressure, improves system stability and safety, and reduces costs and risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO HENGTUO ENVIRONMENTAL PROTECTION TECH
- Filing Date
- 2025-06-17
- Publication Date
- 2026-05-26
AI Technical Summary
The unstable flow and pressure of coal gas in the blast furnace pulverized coal injection system leads to temperature fluctuations in the flue gas furnace and coal mill, affecting system safety and production efficiency. Furthermore, the lack of carbon monoxide concentration monitoring poses a safety hazard.
It adopts a multi-valve regulating structure and a carbon monoxide thermal conductivity gas analyzer, combined with real-time monitoring and automatic control, to achieve precise control of gas flow and pressure through equipment such as gas electric regulating valves and flow meters, monitor carbon monoxide and oxygen concentrations, and set up safety interlock functions.
It achieves rapid, precise and stable control of gas flow and pressure, reduces temperature fluctuations, improves system stability and safety, saves gas consumption, reduces production costs, and avoids safety accidents.
Smart Images
Figure CN224280326U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of blast furnace pulverized coal technology, and in particular to a gas pressure stabilization and control device for a blast furnace pulverized coal injection system. Background Technology
[0002] Blast furnace smelting is a continuous production process that reduces iron ore into pig iron. Solid raw materials such as iron ore, coke, and flux are fed into the blast furnace in batches according to a specified ratio through the top charging device, maintaining a certain height of the charge level in the furnace throat. Coke and ore form an alternating stratified structure within the furnace. Pulverized coal injection is the most direct and effective method for blast furnace pig iron smelting. In the blast furnace pulverized coal injection system, a stable supply of pulverized gas is crucial for temperature control during the pulverizing process. Fluctuations in gas flow and pressure directly affect the temperature of the flue gas furnace and the coal mill, thus impacting the quality of the pulverized coal and the safe operation of the system.
[0003] Currently, the traditional use of single regulating valves in the gas pipelines of blast furnace pulverized coal injection systems leads to unstable gas flow and pressure, and lag in regulation. When the gas pipeline pressure fluctuates, manual operation makes it difficult to quickly stabilize the flow and pressure, resulting in large fluctuations in the inlet temperature of the flue gas furnace and coal mill. This affects the safety and production efficiency of the pulverized coal injection system, impacting pulverized coal output, coal powder quality, and energy consumption. Furthermore, blast furnace pulverized coal injection systems generally use single-valve regulation for gas pipelines and lack carbon monoxide concentration detectors (lacking thermal conductivity gas analysis, real-time monitoring of high and low CO concentrations in the blast furnace pulverized coal injection gas pipelines is impossible; the lack of CO concentration monitoring results in insufficient parameters for regulation). The high-temperature exhaust gas pipelines of the hot blast stove (the high-temperature exhaust gas used in the pulverized coal injection system) lack online monitoring of key parameters such as carbon monoxide (CO) and oxygen (O2), posing certain safety hazards. Summary of the Invention
[0004] In order to overcome the above-mentioned problems in the prior art, this utility model proposes a gas pressure stabilization and control device for a blast furnace pulverized coal injection system.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a gas pressure stabilization and control device for a blast furnace pulverized coal injection system, including a flue gas heating furnace, an outlet pipeline, an exhaust gas pipeline, a coal gas pipeline, and a combustion-supporting pipeline. The exhaust gas pipeline is equipped with an exhaust gas fan, an electric exhaust gas regulating valve, an exhaust gas flow meter, and an exhaust gas pressure transmitter. The outlet pipeline is equipped with a coal mill inlet temperature thermal resistor and a coal mill inlet pressure transmitter. The combustion-supporting pipeline is equipped with a combustion-supporting fan, a combustion-supporting air flow meter, and a combustion-supporting air... The gas pipeline is equipped with a pressure transmitter, a combustion air electric regulating valve, a gas pressure transmitter, a gas flow meter, and a gas electric regulating valve. The outlet pipeline is also equipped with an outlet temperature thermocouple and an outlet pressure transmitter. The exhaust gas pipeline is equipped with an exhaust gas carbon monoxide detector and an exhaust gas oxygen content detector. The gas pipeline is also equipped with a gas pneumatic quick-cut valve, a gas electric blind valve, a gas electric butterfly valve, and a carbon monoxide thermal conductivity gas analyzer. There are at least two gas electric regulating valves.
[0006] The aforementioned gas pressure stabilization and control device for a blast furnace pulverized coal injection system includes a flue gas furnace pressure transmitter and a flue gas furnace temperature thermocouple installed on the flue gas heating furnace.
[0007] The aforementioned gas pressure stabilization and control device for a blast furnace pulverized coal injection system includes two electrically operated gas regulating valves connected in series.
[0008] The aforementioned gas pressure stabilization and control device for a blast furnace pulverized coal injection system includes more than two electric gas regulating valves, with multiple electric gas regulating valves connected in parallel.
[0009] The aforementioned gas pressure stabilization and control device for a blast furnace pulverized coal injection system includes an electric regulating valve for venting gas installed on the outlet pipeline.
[0010] The aforementioned gas pressure stabilization and control device for a blast furnace pulverized coal injection system includes an electric quick-cut valve for waste gas and a thermal resistance temperature detector for waste gas on the waste gas pipeline.
[0011] The beneficial effects of this invention are that it significantly stabilizes pressure and controls temperature. Compared with existing single-valve regulation technology, this invention adopts a multi-valve regulation structure, which can more quickly and accurately stabilize the flow and pressure of the gas pipeline. When the gas pressure fluctuates by about ±10 kPa, the flue gas furnace temperature and the coal mill inlet temperature can be stabilized within ±2 degrees Celsius. The significantly improved temperature control accuracy ensures the stability of the pulverizing process and the quality of the pulverized coal.
[0012] The newly added CO concentration thermal conductivity gas analyzer monitoring instrument in the gas pipeline can monitor the gas concentration value in real time and adjust the gas flow rate according to the gas concentration value data algorithm. The gas composition monitoring instrument in the hot blast stove exhaust gas pipeline can detect safety hazards such as abnormal CO and O2 content in a timely manner. Combined with the system's early warning and automatic control functions, it can effectively avoid the occurrence of safety accidents. Compared with the existing technology, the safety performance has been greatly improved.
[0013] By precisely controlling the gas flow and pressure, gas waste caused by excessive or fluctuating flow was avoided. Compared to the same period last year, gas flow decreased by approximately 10%, achieving the goal of energy conservation and consumption reduction, and lowering production costs. Based on 8,000 hours of operation per year, this translates to annual gas savings of 8 million cubic meters. 3 This saves 800,000 to 4 million yuan in costs. The various equipment parameters (gas regulating valve opening, temperature, pressure, CO, O2, and flow rates) are interconnected and work together to form an organic whole. Through this coordinated operation, comprehensive control of gas flow, pressure, and temperature is achieved, ensuring stable system operation and safety. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;
[0015] Figure 2 This is a schematic diagram of Embodiment 2 of this utility model.
[0016] Among them, 1. First gas electric regulating valve, 2. Gas electric blind valve, 3. Gas electric butterfly valve, 4. Carbon monoxide thermal conductivity gas analyzer, 5. Gas pressure transmitter, 6. Gas pneumatic quick-cut valve, 7. Second gas electric regulating valve, 8. Gas flow meter, 9. Combustion air flow meter, 10. Combustion air pressure transmitter, 11. Combustion air electric regulating valve, 12. Flue gas furnace pressure transmitter, 13. Flue gas furnace temperature thermocouple, 14. Exhaust gas electric regulating valve, 15. Exhaust gas carbon monoxide detector, 16. Exhaust gas oxygen content meter. Detector, 17. Exhaust gas flow meter, 18. Exhaust gas electric quick-cut valve, 19. Exhaust gas pressure transmitter, 20. Exhaust gas temperature resistance thermometer, 21. Outlet temperature thermocouple, 22. Outlet pressure transmitter, 23. Coal mill inlet temperature resistance thermometer, 24. Coal mill inlet pressure transmitter, 25. Flue gas heating furnace, 26. Outlet pipeline, 27. Exhaust gas pipeline, 28. Coal gas pipeline, 29. Combustion-supporting pipeline, 30. Combustion-supporting fan, 31. Exhaust gas fan, 32. Third coal gas electric regulating valve, 33. Fourth coal gas electric regulating valve. Detailed Implementation
[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0018] Example 1
[0019] like Figure 1 As shown, this embodiment discloses a gas pressure stabilization and control device for a blast furnace pulverized coal injection system, including a flue gas heating furnace 25, an outlet pipeline 26, an exhaust gas pipeline 27, a gas pipeline 28, and a combustion-supporting pipeline 29. The flue gas heating furnace 25 is equipped with a flue gas furnace pressure transmitter 12 and a flue gas furnace temperature thermocouple 13. The exhaust gas pipeline 27 is equipped with an exhaust gas fan 31, an electric exhaust gas regulating valve 14, an exhaust gas flow meter 17, an exhaust gas pressure transmitter 19, an electric exhaust gas quick-cut valve 18, and an exhaust gas temperature resistance thermometer 20. To monitor the gas composition in the exhaust gas in real time and ensure system safety, an exhaust gas carbon monoxide detector 15 and an exhaust gas oxygen content detector 16 are installed on the exhaust gas pipeline.
[0020] The outlet pipeline 26 is equipped with a coal mill inlet temperature resistance thermometer 23, a coal mill inlet pressure transmitter 24, an outlet temperature thermocouple 21, and an outlet pressure transmitter 22. The combustion-supporting pipeline is equipped with a combustion-supporting fan 30, a combustion-supporting air flow meter 9, a combustion-supporting air pressure transmitter 10, and a combustion-supporting air electric regulating valve 11.
[0021] The gas pipeline is equipped with a gas pressure transmitter 5, a gas flow meter 8, an electric gas regulating valve, a pneumatic quick-cut gas valve 6, an electric gas blind valve 2, an electric gas butterfly valve 3, and a carbon monoxide thermal conductivity gas analyzer 4. In this embodiment, the electric gas regulating valve includes a first electric gas regulating valve 1 and a second electric gas regulating valve 7 connected in series with it.
[0022] To ensure system safety, an electric regulating valve for venting gas is installed on the outlet pipeline.
[0023] In this embodiment, all valves, flow meters, and the carbon monoxide thermal conductivity gas analyzer 4, the exhaust carbon monoxide detector 15, and the exhaust oxygen content detector 16 are connected to the controller. The flow meters, carbon monoxide thermal conductivity gas analyzer 4, the exhaust carbon monoxide detector 15, and the exhaust oxygen content detector 16 transmit monitoring information to the controller in real time. The controller adjusts the valve opening based on the real-time monitoring information. The controller pre-sets the upper and lower limits of the coal gas flow rate, CO and O2 concentrations, flue gas furnace temperature, and pulverizer inlet temperature of the coal injection system (e.g., setting the lower limit of the coal gas flow rate to 8000 m³ / h). 3 / h, maximum 9000m 3 If the limit is exceeded ( / h), the nitrogen charging safety interlock function, early warning function, voice alarm function, or emergency avoidance shutdown procedure will be triggered.
[0024] Normal operation: Each instrument monitors the parameters of the gas pipeline, exhaust gas pipeline, and outlet pipeline in real time and transmits the data to the controller. Based on the set upper and lower limits of gas flow and the temperature control target, the controller controls the appropriate opening degree of the two series-connected electric gas regulating valves to stabilize the gas flow and pressure within the set range, ensuring that the inlet temperature of the flue gas furnace and coal mill remains stable near the target value.
[0025] When pressure fluctuations occur, specifically when the gas pipeline pressure fluctuates by approximately ±10 kPa, the controller calculates the adjustment amount of the two series-connected electric gas regulating valves based on real-time pressure and temperature data. By adjusting the valve opening of the two series-connected electric gas regulating valves, the gas flow rate is adjusted accordingly (by approximately 10% compared to the same period last year), thereby stabilizing the gas pipeline pressure and simultaneously stabilizing the flue gas furnace temperature and mill inlet temperature within ±2 degrees Celsius.
[0026] The carbon monoxide thermal conductivity gas analyzer 4 in the gas pipeline monitors the CO concentration in the gas pipeline. By using the changes in the concentration parameter, a suitable value is found to set the valve value of the gas electric regulating valve. The exhaust gas carbon monoxide detector 15 and exhaust gas oxygen content detector 16 in the exhaust gas pipeline monitor the concentration of CO and O2. When the concentration exceeds the standard, the system issues a warning signal and voice alarm, and implements nitrogen purging interlock safety measures to prompt the operator to check and deal with the situation, so as to avoid safety accidents caused by incomplete combustion of flue gas in the flue gas furnace or excessive CO concentration at the coal mill inlet due to excessively high gas concentration.
[0027] Example 2
[0028] The pipeline structure in this embodiment is the same as that in Embodiment 1, such as... Figure 2 As shown, the difference is that the gas electric regulating valve of the gas pipeline in this embodiment includes a first gas electric regulating valve 1, and a third gas electric regulating valve 32 and a fourth gas electric regulating valve 33 connected in parallel with the first gas electric regulating valve 1 (multiple gas electric regulating valves connected in parallel with the first gas electric regulating valve 1 can be provided, and there are two in this embodiment).
[0029] Normal operation: Each instrument monitors the parameters of the gas pipeline, exhaust gas pipeline, and outlet pipeline in real time and transmits the data to the controller. Based on the set upper and lower limits of gas flow and the temperature control target, the controller controls the appropriate opening degree of the three parallel electric gas regulating valves to stabilize the gas flow and pressure within the set range, ensuring that the inlet temperature of the flue gas furnace and coal mill remains stable near the target value.
[0030] When pressure fluctuations occur, specifically when the gas pipeline pressure fluctuates by approximately ±10 kPa, the controller calculates the adjustment amount of the three parallel electric gas regulating valves based on real-time pressure and temperature data. By adjusting the valve opening of these three parallel electric gas regulating valves, the gas flow rate is adjusted accordingly (by approximately 10% compared to the same period last year), thereby stabilizing the gas pipeline pressure and simultaneously stabilizing the flue gas furnace temperature and mill inlet temperature within ±2 degrees Celsius.
[0031] The carbon monoxide thermal conductivity gas analyzer 4 in the gas pipeline monitors the CO concentration in the gas pipeline. By using the changes in the concentration parameter, a suitable value is found to set the valve value of the gas electric regulating valve. The exhaust gas carbon monoxide detector 15 and exhaust gas oxygen content detector 16 in the exhaust gas pipeline monitor the concentration of CO and O2. When the concentration exceeds the standard, the system issues a warning signal and voice alarm, and implements nitrogen purging interlock safety measures to prompt the operator to check and deal with the situation, so as to avoid safety accidents caused by incomplete combustion of flue gas in the flue gas furnace or excessive CO concentration at the coal mill inlet due to excessively high gas concentration.
[0032] The effects of using the above-mentioned device are as follows: 1. Energy saving and consumption reduction: Gas consumption is reduced by about 10% (annual gas saving of 1000m³ for the pulverizing system). 3 h * 8000h = 8 million m 3 Annual cost savings: Maximum benefit 8 million * 0.5 yuan = 4 million yuan, minimum benefit 8 million * 0.1 yuan = 800,000 yuan (annual cost savings from gas consumption: 800,000 yuan - 4 million yuan)
[0033] 2. Precise temperature control: Combining the temperature feedback of the coal mill, the flue gas furnace and mill inlet temperature are kept stable within ±2℃ through the coordinated control of the dual valve (or triple valve group) of the gas electric regulating valve.
[0034] 3. Enhanced Safety and Environmental Protection: The newly added equipment and instruments enable more comprehensive data monitoring, safer interlocking procedures, and more precise data algorithms for control. Annual CO2 emissions will be reduced by approximately 10,000 tons (based on an estimated 1.8 kg CO2 emission per cubic meter of coal gas).
[0035] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of this utility model.
Claims
1. A gas pressure stabilization and control device for a blast furnace pulverized coal injection system, comprising a flue gas heating furnace, an outlet pipeline, an exhaust gas pipeline, a coal gas pipeline, and a combustion-supporting pipeline; wherein the exhaust gas pipeline is equipped with an exhaust gas fan, an electric exhaust gas regulating valve, an exhaust gas flow meter, and an exhaust gas pressure transmitter; the outlet pipeline is equipped with a coal mill inlet temperature resistance thermometer and a coal mill inlet pressure transmitter; the combustion-supporting pipeline is equipped with a combustion-supporting fan, a combustion-supporting air flow meter, a combustion-supporting air pressure transmitter, and an electric combustion-supporting air regulating valve; and the coal gas pipeline is equipped with a coal gas pressure transmitter, a coal gas flow meter, and an electric coal gas regulating valve, characterized in that... The outlet pipeline is also equipped with an outlet temperature thermocouple and an outlet pressure transmitter; the exhaust gas pipeline is equipped with an exhaust gas carbon monoxide detector and an exhaust gas oxygen content detector; the coal gas pipeline is also equipped with a coal gas pneumatic quick-cut valve, a coal gas electric blind valve, a coal gas electric butterfly valve, and a carbon monoxide thermal conductivity gas analyzer, and there are two or more coal gas electric regulating valves.
2. The gas pressure stabilizing and controlling device for a blast furnace pulverized coal injection system according to claim 1, characterized in that, The flue gas heating furnace is equipped with a flue gas furnace pressure transmitter and a flue gas furnace temperature thermocouple.
3. A gas pressure stabilizing and controlling device for a blast furnace pulverized coal injection system according to claim 1, characterized in that, There are two gas electric regulating valves, which are connected in series.
4. A gas pressure stabilizing and controlling device for a blast furnace pulverized coal injection system according to claim 1, characterized in that, There are more than two gas electric regulating valves, and multiple gas electric regulating valves are arranged in parallel.
5. A gas pressure stabilizing and controlling device for a blast furnace pulverized coal injection system according to claim 1, characterized in that, An electric regulating valve for venting gas is installed on the outlet pipeline.
6. A gas pressure stabilizing and controlling device for a blast furnace pulverized coal injection system according to claim 1, characterized in that, The exhaust gas pipeline is equipped with an electric quick-cut valve for exhaust gas and an exhaust gas temperature resistance thermometer.