Intelligent control system for steam injection of sintering machine material surface

Abstract

The application relates to a sintering machine material surface steam blowing intelligent control system, belonging to the technical field of intelligent control, which comprises a primary mixer, a secondary mixer, a sintering machine mixed material bin, a sintering machine, a large flue CO concentration detector, a finished sintered ore drum strength analyzer, and is characterized in that material sequentially passes through the primary mixer, the secondary mixer, the sintering machine mixed material bin and the sintering machine, a sintering machine material surface steam blowing main pipe is arranged on the sintering machine, the large flue CO concentration detector and the finished sintered ore drum strength analyzer are arranged in the large flue of the sintering machine, and the large flue CO concentration detector and the finished sintered ore drum strength analyzer are connected with a main control system. The sintering machine material surface steam blowing amount is automatically adjusted, intelligent control is realized, the steam consumption is reasonably allocated, the production requirements are met, energy waste is reduced, and the problem of sintered ore quality decline caused by improper sintering machine material surface steam blowing amount is solved.

Description

Technical Field

[0001] This invention belongs to the field of intelligent control technology, specifically relating to an intelligent control system for steam injection on the material surface of a sintering machine. Background Technology

[0002] Energy conservation, emission reduction, and quality improvement are the three major challenges facing iron ore powder sintering. The sintering process is a major contributor to pollutant emissions and energy consumption in the steel industry. Sintering produces SO2 and NO... x Dust, smoke, and dioxins account for 60-70%, 50%, 30%, and over 70% of pollutants from the iron and steel industry, respectively, while energy consumption accounts for 10%. CO emissions during sintering exceed 5000 mg / Nm³. 3 CO emissions are significantly higher than those of other pollutants. Neither sintering process control nor end-of-pipe treatment technologies have been effective in reducing CO emissions; therefore, how to effectively reduce CO emissions is an urgent problem that needs to be solved.

[0003] With the continuous tightening of ultra-low emission standards for sintering flue gas pollutants in the steel industry, many regions have put forward requirements for green development and comprehensive A-level emission standards for the steel industry. Sintering surface steam injection technology, with its potential advantages in energy saving, emission reduction, and quality improvement, has become a new research hotspot and is widely considered to be a sintering process control technology with certain comprehensive emission reduction effects. More and more sintering plants are adopting this technology in their production processes. This can improve the quality of sintered ore and reduce emissions of pollutants such as carbon monoxide.

[0004] However, the current steam injection technology for sintering machine feed surface has the following problems in practical applications:

[0005] Improper use of steam injection on the material surface can lead to excessively high permeability of the material during sintering, exacerbating overburning of the sinter and ultimately resulting in an increased return rate.

[0006] The moisture in the mixed material, besides the water inherent in the raw materials, typically comes from two sources: hot water added during the primary mixing process and hot water or steam added during the secondary mixing process. Therefore, the amount of steam injected onto the sintering machine surface should be linked to the amount of water added in the first two processes. How to intelligently control the steam volume to achieve the highest possible sinter quality while meeting CO emission concentration requirements has become a pressing issue for this technology. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes an intelligent control system for steam injection on the sintering machine material surface, comprising a primary mixer, a secondary mixer, a sintering machine mixed material trough, a sintering machine, a CO concentration detector in the main flue, and a finished sintering drum strength analyzer. Materials sequentially pass through the primary mixer, secondary mixer, sintering machine mixed material trough, and sintering machine. A main steam injection pipe is installed on the sintering machine material surface. A CO concentration detector in the main flue and a finished sintering drum strength analyzer are installed in the main flue of the sintering machine. These two instruments are connected to the main control system.

[0008] Furthermore, the primary mixer is equipped with a primary mixer cold water pipe and a primary mixer hot water pipe. The primary mixer cold water pipe is equipped with a primary mixer cold water pipe flow regulating valve and a V1 flow meter, and the primary mixer hot water pipe is equipped with a primary mixer hot water pipe flow regulating valve and a V2 flow meter. The primary mixer cold water pipe flow regulating valve and the V1 flow meter are interlocked and controlled by the main control system, and the primary mixer hot water pipe flow regulating valve and the V2 flow meter are interlocked and controlled by the main control system.

[0009] Furthermore, the secondary mixer is equipped with a cold water pipe, a hot water pipe, and a steam pipe. A flow regulating valve and a V3 flow meter are installed on the cold water pipe, a flow regulating valve and a V4 flow meter are installed on the hot water pipe, and a flow regulating valve and a V5 flow meter are installed on the steam pipe. The flow regulating valves and V3 and V4 flow meters of the cold water, hot water, and steam pipes are all interlocked and controlled by the main control system.

[0010] Furthermore, a steam pipe for the sintering machine mixing ore trough is provided in the sintering machine mixing ore trough. A steam pipe for the sintering machine mixing ore trough is equipped with a steam pipe flow regulating valve and a V6 flow detector. The steam pipe for the sintering machine mixing ore trough and the V6 flow detector are interlocked and controlled by the intelligent control system module S1 for the mixing ore trough flow. The intelligent control system module S1 for the mixing ore trough flow is connected to the main control system.

[0011] Furthermore, the sintering machine material surface steam injection main pipe is equipped with a sintering machine material surface steam injection main pipe flow regulating valve and a V7 flow detector. The sintering machine material surface steam injection main pipe flow regulating valve and V7 flow detector are interlocked and controlled by the sintering machine material surface steam injection intelligent control system module S2. The sintering machine material surface steam injection intelligent control system module S2 is connected to the main control system.

[0012] The beneficial effects of this invention are as follows:

[0013] (1) Automatically adjust the amount of steam injected onto the sintering machine material surface to achieve intelligent control;

[0014] (2) Rationally allocate steam consumption to meet production requirements and reduce energy waste;

[0015] (3) Most of the detection points required by the system are existing detection points in the sintering production line. Only a small number of detection points need to be added, which requires little investment.

[0016] (4) The system is equipped with error detection, which can realize fault alarm of regulating valve or detection point, and can maintain the normal operation of the system until the fault is resolved through memory function;

[0017] (5) It solved the problem of reduced sinter quality caused by improper steam usage on the sintering machine material surface. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the steam jet structure on the sintering machine material surface of the present invention.

[0019] The attached figures are labeled as follows:

[0020] 1. Primary mixer; 2. Cold water pipe of primary mixer; 3. Hot water pipe of primary mixer; 4. Flow regulating valve for cold water pipe of primary mixer; 5. Flow regulating valve for hot water pipe of primary mixer; 6. Secondary mixer; 7. Cold water pipe of secondary mixer; 8. Hot water pipe of secondary mixer; 9. Steam pipe of secondary mixer; 10. Flow regulating valve for cold water pipe of secondary mixer; 11. Flow regulating valve for hot water pipe of secondary mixer; 12. Flow regulating valve for steam pipe of secondary mixer; 13. Sintering machine mixing bin; 14. Sintering machine mixing material. 15. Steam pipe for ore bin; 16. Steam pipe flow regulating valve for sintering machine mixed ore bin; 17. Steam injection main pipe for sintering machine material surface; 18. Steam injection main pipe flow regulating valve for sintering machine material surface; 19. Sintering machine; 20. CO concentration detector for main flue; 21. Finished sinter drum strength analyzer; 22. V1 flow meter; 23. V3 flow meter; 24. V4 flow meter; 25. V5 flow meter; 26. V6 flow meter; 27. V7 flow meter. Detailed Implementation

[0021] To make the technical means and objectives of this invention easier to understand, the invention is further described below in conjunction with specific embodiments, including an intelligent control system for steam injection on the material surface of a sintering machine. Figure 1As shown, the system includes a primary mixer 1, a secondary mixer 6, a sintering machine mixing trough 13, a sintering machine 18, a large flue CO concentration detector 19, and a finished sinter drum strength analyzer 20. The material passes through the primary mixer 1, the secondary mixer 6, the sintering machine mixing trough 13, and the sintering machine 18 in sequence. The sintering machine 18 is equipped with a sintering machine material surface steam injection main pipe 16. The large flue of the sintering machine 18 is equipped with the large flue CO concentration detector 19 and the finished sinter drum strength analyzer 20. The large flue CO concentration detector 19 and the finished sinter drum strength analyzer 20 are connected to the main control system.

[0022] The primary mixer 1 is equipped with a primary mixer cold water pipe 2 and a primary mixer hot water pipe 3. The primary mixer cold water pipe 2 is equipped with a primary mixer cold water pipe flow regulating valve 4 and a V1 flow meter 21. The primary mixer hot water pipe 3 is equipped with a primary mixer hot water pipe flow regulating valve 5 and a V2 flow meter 22. The primary mixer cold water pipe flow regulating valve 4 and the V1 flow meter 21 are controlled by interlocking through the main control system. The primary mixer hot water pipe flow regulating valve 5 and the V2 flow meter 22 are also controlled by interlocking through the main control system.

[0023] The secondary mixer 6 is equipped with a cold water pipe 7, a hot water pipe 8, and a steam pipe 9. The cold water pipe 7 is equipped with a flow regulating valve 10 and a V3 flow meter 23. The hot water pipe 8 is equipped with a flow regulating valve 11 and a V4 flow meter 24. The steam pipe 9 is equipped with a steam regulating valve 12 and a V5 flow meter 25. The cold water pipe flow regulating valve 10 and the V3 flow meter 23 are interlocked and controlled by the main control system. The hot water pipe flow regulating valve 11 and the V4 flow meter 24 are also interlocked and controlled by the main control system. The steam pipe flow regulating valve 12 and the V5 flow meter 25 are also interlocked and controlled by the main control system.

[0024] The sintering machine mixing ore trough 13 is equipped with a sintering machine mixing ore trough steam pipe 14. The sintering machine mixing ore trough steam pipe 14 is equipped with a sintering machine mixing ore trough steam pipe flow regulating valve 15 and a V6 flow detector 26. The sintering machine mixing ore trough steam pipe flow regulating valve 15 and V6 flow detector 26 are interlocked and controlled by the mixing ore trough flow intelligent control system module S1. The mixing ore trough flow intelligent control system module S1 is connected to the main control system.

[0025] The sintering machine material surface steam injection main pipe 16 is equipped with a sintering machine material surface steam injection main pipe flow regulating valve 17 and a V7 flow detector 27. The sintering machine material surface steam injection main pipe flow regulating valve 17 and V7 flow detector 27 are interlocked and controlled by the sintering machine material surface steam injection intelligent control system module S2. The sintering machine material surface steam injection intelligent control system module S2 is connected to the main control system.

[0026] The intelligent control system for steam injection on the sintering machine material surface can be divided into a detection unit and a main control system.

[0027] The detection unit includes a CO concentration detector for the main flue gas duct 19, a finished sinter drum strength analyzer 20, a V1 flow meter 21, a V2 flow meter 22, a V3 flow meter 23, a V4 flow meter 24, a V5 flow meter 25, a V6 flow meter 26, and a V7 flow meter 27.

[0028] The electrical interlock control unit includes the interlocking relationship between the V1 flow meter 21 and the flow regulating valve 4 of the primary mixer's cold water pipe; the interlocking relationship between the V2 flow meter 22 and the flow regulating valve 5 of the primary mixer's hot water pipe; the interlocking relationship between the V3 flow meter 23 and the flow regulating valve 10 of the secondary mixer's cold water pipe; the interlocking relationship between the V4 flow meter 24 and the flow regulating valve 11 of the secondary mixer's hot water pipe; the interlocking relationship between the V5 flow meter 25 and the flow regulating valve 12 of the secondary mixer's steam pipe; the interlocking relationship between the V6 flow meter 26 and the flow regulating valve 15 of the sintering machine's mixed material trough steam pipe; and the interlocking relationship between the V7 flow meter 27 and the flow regulating valve 17 of the sintering machine's material surface steam injection main pipe.

[0029] The main control system controls the intelligent control system module S1 for the flow rate of the mixed ore bin, the intelligent control system module S2 for the steam injection of the sintering machine material surface, the CO concentration detector 19 in the large flue gas duct detects the value VCO; the strength analyzer 20 for the finished sinter drum detects the value BS; the flow detector 21 for V1 detects the value V1, the flow detector 22 for V2 detects the value V2, the flow detector 23 for V3 detects the value V3, the flow detector 24 for V4 detects the value V4, the flow detector 25 for V5 detects the value V5, the flow detector 26 for V6 detects the value V6, and the flow detector 27 for V7 detects the value V7.

[0030] Intelligent control is achieved through the following steps:

[0031] Step 1: Before system startup, set the total input water volume V0t / h for the entire production process, including cold water, hot water, and steam. Input the steam addition amount V7 for the sintering machine 18; input the steam addition amount V6 for the sintering machine mixing ore bin 13;

[0032] Step 2: The remaining cold, hot water, and steam are added at the primary mixer 1 and the secondary mixer 6. The primary mixer 1 accounts for 80% of the remaining cold, hot water, and steam added, that is:

[0033] V1 + V2 = (V0 - V7 - V6) * 80%

[0034] The secondary mixer 6 accounts for 20% of the remaining cold, hot water, and steam additions, that is:

[0035] V3 + V4 + V5 = (V0 - V7 - V6) * 20%

[0036] Step 3, during system startup, adjust the steam pipe flow regulating valve 15 of the sintering machine mixture trough to its minimum, making V6=0, and adjust the steam injection main pipe flow regulating valve 17 of the sintering machine material surface to its minimum, making V7=0, that is:

[0037] V1 + V2 = V0 * 80%

[0038] V3 + V4 + V5 = V0 * 20%

[0039] The VCO value detected by the CO concentration detector 19 in the main flue and the BS value detected by the finished sinter drum strength analyzer 20 are used as reference values.

[0040] Step 4: The intelligent control system module S1 for the flow rate of the mixed material trough adjusts the steam pipe flow regulating valve 15 of the sintering machine mixed material trough according to the changes in the VCO value and BS value. The specific algorithm is as follows: initially, the steam pipe flow regulating valve 15 of the sintering machine mixed material trough is closed, and then the flow rate regulating valve 15 of the sintering machine mixed material trough is gradually increased slightly. Throughout the adjustment process, V1+V2=(V0-V7-V6)*80% and V3+V4+V5=(V0-V7-V6)*20% will be maintained. As the steam pipe flow regulating valve 15 of the sintering machine mixture trough is gradually increased, several sets of changes in VCO and BS values ​​will be recorded and compared with the reference values ​​of VCO detected by the large flue CO concentration detector 19 and BS detected by the finished sinter drum strength analyzer 20 in step 3. Whenever the VCO value decreases or the BS value increases, the steam pipe flow regulating valve 15 of the sintering machine mixture trough will be further increased slightly. During the gradual increase of the steam pipe flow regulating valve 15 of the sintering machine mixture trough, the VCO and BS values ​​will fluctuate. When the VCO value reaches the minimum threshold and the BS value reaches the maximum threshold, the adjustment process will stop, and the V6 value, which has a relatively low VCO value and a relatively high BS value, will be selected as the commonly used value and stored.

[0041] Step 5: The intelligent control system module S2 for steam injection on the sintering machine material surface adjusts the flow regulating valve 17 of the steam injection main pipe on the sintering machine material surface according to the changes in VCO and BS values. The specific algorithm is as follows: Initially, the flow regulating valve 17 of the steam injection main pipe on the sintering machine material surface is closed, and then gradually and slightly increased. Throughout the adjustment process, V1+V2=(V0-V7-V6)*80% and V3+V4+V5=(V0-V7-V6)*20% are maintained. When the VCO value decreases, the flow regulating valve 17 of the steam injection main pipe on the sintering machine material surface is slightly increased, and the changing trends of the VCO and BS values ​​are recorded simultaneously. This process is repeated several times. Since the production process requires a minimum BS value (BSmin), the adjustment can be stopped once the VCO value reaches its minimum, provided that the BS value detected by the finished sinter drum strength analyzer 20 is ≥ BSmin. The V7 value at this point is then recorded and stored as a commonly used value. Simultaneously, the corresponding V1, V2, V3, V4, and V5 values ​​in the primary mixer 1 and secondary mixer 6 are also recorded and stored as commonly used values.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A smart control system for steam injection on the material surface of a sintering machine, characterized in that, The system includes a primary mixer (1), a secondary mixer (6), a sintering machine mixing ore bin (13), a sintering machine (18), a large flue CO concentration detector (19), and a finished sinter drum strength analyzer (20). The material passes through the primary mixer (1), the secondary mixer (6), the sintering machine mixing ore bin (13), and the sintering machine (18) in sequence. The sintering machine (18) is equipped with a sintering machine material surface steam injection main pipe (16). The large flue of the sintering machine (18) is equipped with a large flue CO concentration detector (19) and a finished sinter drum strength analyzer (20). The large flue CO concentration detector (19) and the finished sinter drum strength analyzer (20) are connected to the main control system. The primary mixer (1) is equipped with a primary mixer cold water pipe (2) and a primary mixer hot water pipe (3). The primary mixer cold water pipe (2) is equipped with a primary mixer cold water pipe flow regulating valve (4) and a V1 flow meter (21). The primary mixer hot water pipe (3) is equipped with a primary mixer hot water pipe flow regulating valve (5) and a V2 flow meter (22). The primary mixer cold water pipe flow regulating valve (4) and the V1 flow meter (21) are controlled by the main control system. The primary mixer hot water pipe flow regulating valve (5) and the V2 flow meter (22) are controlled by the main control system. The secondary mixer (6) is equipped with a secondary mixer cold water pipe (7), a secondary mixer hot water pipe (8), and a secondary mixer steam pipe (9). The secondary mixer cold water pipe (7) is equipped with a secondary mixer cold water pipe flow regulating valve (10) and a V3 flow meter (23). The secondary mixer hot water pipe (8) is equipped with a secondary mixer hot water pipe flow regulating valve (11) and a V4 flow meter (24). The secondary mixer steam pipe (9) is equipped with a secondary mixer steam pipe flow regulating valve (12) and a V5 flow meter (25). The secondary mixer cold water pipe flow regulating valve (10) and V3 flow meter (23) are controlled by the main control system. The secondary mixer hot water pipe flow regulating valve (11) and V4 flow meter (24) are controlled by the main control system. The secondary mixer steam pipe flow regulating valve (12) and V5 flow meter (25) are controlled by the main control system. The sintering machine mixing ore trough (13) is provided with a sintering machine mixing ore trough steam pipe (14), and a sintering machine mixing ore trough steam pipe flow regulating valve (15) and a V6 flow detector (26) are provided on the sintering machine mixing ore trough steam pipe (14). The sintering machine mixing ore trough steam pipe flow regulating valve (15) and V6 flow detector (26) are controlled by the mixing ore trough flow intelligent control system module S1. The mixing ore trough flow intelligent control system module S1 is connected to the main control system. The sintering machine material surface steam injection main pipe (16) is equipped with a sintering machine material surface steam injection main pipe flow regulating valve (17) and a V7 flow detector (27). The sintering machine material surface steam injection main pipe flow regulating valve (17) and V7 flow detector (27) are controlled by the sintering machine material surface steam injection intelligent control system module S2. The sintering machine material surface steam injection intelligent control system module S2 is connected to the main control system. The intelligent control system module S1 for the mixed material trough flow rate adjusts the steam pipe flow regulating valve (15) of the sintering machine mixed material trough according to the changes in VCO value detected by the large flue CO concentration detector (19) and BS value detected by the finished sinter drum strength analyzer (20); the intelligent control system module S2 for the steam injection of the sintering machine material surface adjusts the steam injection main pipe flow regulating valve (17) of the sintering machine material surface according to the changes in VCO value and BS value.

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