Agricultural Machinery Chain, Double Roller Chain, Standard Roller Chain Ningbo Combine Machinery Co.,Ltd. , http://www.combine-harvester-parts.com
With the enhancement of energy-saving awareness, the enthusiasm of steel-fired enterprises for launching high-temperature blast furnace TRT projects has increased, and the technical level of our country's own development and development of TRT equipment has also been continuously improved. The "Zhong Guo Zi" TRT equipment not only satisfies the needs of domestic steel companies, but also successfully exported to Brazil, India, South Korea and other countries. According to incomplete statistics, there are currently about 400 (sets) TRT units in China. For each unit, if the average power generation is 8000 kWh, the annual energy recovery will be 69.20 million kWh/set, and the electricity price will be calculated at 0.50 yuan/kWh, which can realize an annual total revenue of 34.56 million yuan/set; if the production cost is calculated based on 10% of the revenue , then the annual net income reached 31.10 million yuan / Taiwan. If calculated by 300 sets, the annual net income will reach 9.3 billion yuan, and the energy-saving efficiency will be significant.
Develop related technologies to improve stability and reliability. High-precision top pressure intelligent stabilization control technology: Integrate the practical experience of the stability control of traditional TRT devices. By applying the principle of pipe network fluid mechanics, establish the relationship between the amount of top pressure fluctuation and the control adjustment. The advanced mathematical model and advanced control algorithm, at the same time, adopted a hybrid intelligent expert control algorithm and advanced switching algorithm with self-correcting and perfect functions. In the practical application of Liuzhou Iron and Steel, Handan Iron and Steel, TISCO, Baosteel Stainless, and Tiangang, the top pressure fluctuation range of the blast furnace during normal operation of the TRT is ±1.5 kPa to ±2 kPa (the international advanced level is ± 5 kPa); TRT load rejection, blast furnace top pressure fluctuation range of ± 2.5 kPa ~ ± 4 kPa (the international advanced level of ± 8 kPa). This technology improves the safety and reliability of TRT installations, improves the smelting strength of ironmaking and pig iron production, and its control technology is at the leading international level.
3H-TRT Technology for Enhancing Energy Saving and Environmental Protection in Optimization: At present, the use of TRT still remains in the general use of energy-saving power generation and control of furnace top pressure. Can it tap potential on this basis and bring greater energy-saving benefits into relevant equipment? The focus of attention of manufacturing companies and technology R&D units. The related domestic enterprises proposed a new viewpoint through research and development, and introduced a top pressure energy recovery system for improving the blast furnace smelting intensity, abbreviated as 3H-TRT. The system can not only recover the pressure energy and heat energy of blast furnace top gas through the installation of TRT device, but also adopt the STPC technology with international advanced level (TRT top pressure stability and high precision control technology) to perform high precision on blast furnace top pressure. Intelligent control can increase the setting value of blast furnace top pressure, increase the quality and flow of blast furnace blast, thereby increasing blast furnace smelting intensity, reducing the coke ratio, and achieving high efficiency of the blast furnace. According to reports, blast furnace high-pressure operation can achieve the effect of strengthening smelting, increasing production, and reducing the coke ratio. Each 10 kPa increase in the top pressure of the blast furnace can increase the air volume by 2% to 3%. For large blast furnaces, the increase in top pressure by 10 kPa can increase production by 1.1% ± 0.2% and the coke ratio by 0.5% to 1.0%. At the same time high-pressure blast furnace operation is conducive to the smelting of low-silicon iron. The 3H-TRT system not only recovers the energy previously wasted in the pressure reducing valve group, but also increases the utilization factor of the blast furnace by 2% to 3% and reduces the coke ratio by 1% to 3%, thereby increasing the daily production of blast furnace pig iron and reducing the cost of blast furnace smelting. , to further strengthen blast furnace smelting. 3H-TRT has important strategic significance for further improving the utilization of resources and energy in China's steel industry, reducing waste emissions, minimizing energy consumption of products, and improving product quality.
Wet conversion technology: A 2500 cubic meter blast furnace of a steel company adopts a wet two-stage venturi system to purify the blast furnace gas. The wet blast furnace gas purification system has high energy consumption and high net water content (low gas heat efficiency). ), blast furnace gas residual pressure power generation facilities and other shortcomings, decided to rebuild dry bag bag dust removal facilities to replace the existing wet cleaning facilities, the existing wet method as a dry bag Filter dust backup facilities. After more than one year of hard work, the wet-to-dry transformation of five to six blast furnaces has been completed. According to incomplete statistics, after a 2,500-cubic-meter blast furnace is wet and dry, it can increase the power generation by 20% to 30% year-on-year. Each set can save thousands of tons of dust removal water per year, and can increase production value by 60 million yuan to 80 million yuan. To play a huge role in energy conservation and emission reduction.
High efficiency and low consumption have become the direction of technological development. BPRT technology: The blast furnace blower unit (hereinafter referred to as the BPRT unit), in which the gas turbine and the motor are driven coaxially, integrates the functions of blast furnace blasting and energy recovery. It is a blower group driven by dual energy sources of energy and gas energy. In this unit, the energy recovered by the blast furnace gas turbine is not used to generate electricity, but directly drives the blower coaxially. Without the mechanical energy of the generator, the energy can be converted into electricity and electricity. The loss of secondary energy conversion of mechanical energy is more efficient in recovery. When the turbine is operating normally, the clutch is engaged and the power recovered by the turbine is transferred to the blast furnace blower. When the furnace condition is not smooth and the gas volume is small or the blast furnace is off wind, the clutch will automatically disconnect the blast furnace gas turbine, which not only ensures the normal production of the blast furnace, but also ensures the full use of energy. For the first time, the BPRT unit merged two units of the gas turbine and the blast furnace blower and designed it as the same system. The generator and distribution system were eliminated, and the automatic control system, lubricant system, and power oil system were merged, simplifying the original The huge system, and the energy recovered directly as a rotating mechanical energy supplement on the shaft, to avoid the loss of energy conversion. With the development, application and experience of the complete set of technologies, the BPRT coaxial device has achieved a breakthrough and more than 40 sets have been applied to steel companies.
Common TRT technology: Two blast furnaces share a blast furnace gas residual pressure turbine power generation unit, and the shared TRT is an abbreviation of the common blast furnace gas residual pressure turbine power generation unit. Domestic companies have developed two sets of blast furnaces to share a turbine's energy recovery device. Using the two large-scale valve systems of each blast furnace, the gas is introduced into different turbine channels of the same turbine to drive a generator to generate electricity. Two sets of turbines can be used. The static pressure is controlled at the same time to control the top pressure of the two blast furnaces. This unit can also meet the process requirements for one blast furnace operation, another blast furnace off-wind, or no production. This technology can be used for furnaces of the same specification, but also for furnaces of different specifications.
The blast furnace gas of the two blast furnaces is dusted and then enters the common TRT from both sides. The gas flow is axially entered into the cascade through the casing diversion, and the gas expands in the independent flow paths formed by the static and dynamic cascades. In doing work, the pressure and temperature are reduced step by step, and they are converted into kinetic energy to make them rotate, which drives the generator to generate electricity. The gas exiting from the cascade is diffused by the diffuser to increase its back pressure to a certain value. It is then discharged from the middle through the exhaust volute and enters the pipeline, ie the inlet on both sides and the intermediate exhaust.
After scientific research, this technology has been successfully applied to the two-in-one blast furnace TRT device of the Jinxi Iron & Steel Co., Ltd. This is the first domestically-used dry-type common blast furnace TRT that uses advanced control technology and is the first to be put into operation. At present, there are more than 40 TRTs for common-use blast furnaces for application.
At present, China's self-produced TRT equipment, gas flow rate of 100,000 cubic meters / hour to 800,000 cubic meters / hour, including a variety of blast furnace dust removal method of dry, wet and wet and dry TRT unit, has the following characteristics: Developed a self-adjustable turbine blade with two stages of adjustable static turbine blades and two stages of turbine blades, and adopted the mainstream DCS/PLC control system to realize the process detection and control of the TRT system and completed the automatic start-up of the TRT device. , Downtime, Speed-up, Grid-connected, Power-up, and Top-down pressure; Automated control of electromechanical, electro-hydraulic, and instrumental power integration, easy operation, and high reliability. Although China's blast furnace TRT equipment has made some achievements after many years of innovation and development, there is still a certain gap in the reliability of products and the application of large blast furnaces above 5,000 cubic meters, and domestic manufacturing companies are required to continuously develop and innovate through the mastery of core technologies. And continue to optimize and upgrade, promote the development and application of TRT, contribute to energy-saving and emission reduction of steel enterprises.
Process upgrade for energy saving and environmental protection
The blast furnace gas residual pressure turbine power generation unit (TRT) is an energy recovery device that uses the residual pressure of the blast furnace top to introduce the gas into the turbine to expand and do work, and drives the generator to generate electricity. The TRT device can recover 30% to 50% of the blast furnace blower energy, reduce ironmaking energy consumption, and can also purify gas and reduce pipe network noise pollution.