Intelligent balance system for conveying acid-making flue gas process

Abstract

The utility model provides an acid-making flue gas technology conveying intelligent balance system which comprises a smelting system, a main fan, a sulfuric acid making system, a tail gas desulfurization system and a chimney which are sequentially communicated, an auxiliary fan is arranged between the sulfuric acid making system and the tail gas desulfurization system, the main fan is connected with a main frequency converter, the auxiliary fan is provided with an auxiliary frequency converter, and the tail gas desulfurization system is connected with the auxiliary frequency converter. The main frequency converter and the auxiliary frequency converter are both connected with the intelligent processing system, a smelting negative pressure meter is arranged between the smelting system and the main fan, an acid making negative pressure meter is arranged between the sulfuric acid making system and the auxiliary fan, and the smelting negative pressure meter and the acid making negative pressure meter are both in signal connection with the intelligent processing system; corresponding negative pressure value parameters are transmitted to the intelligent processing system through the acid making negative pressure meter and the smelting negative pressure meter, the intelligent processing system sets the control range of two negative pressure value control points, and when the control range is not in the control range, the intelligent processing system automatically adjusts the frequency conversion of the two fans to ensure that the negative pressure of the whole system is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of acid-making flue gas process transportation, in particular to an acid-making flue gas process transportation intelligent balancing system. Background Art

[0002] Waste gas generated by industries such as metallurgy, chemical industry, and mining is potentially harmful, especially trace concentrations of SO2 in the waste gas have more significant biological toxicity.

[0003] Sulfur dioxide released into the atmosphere can form acid rain, acidifying water quality, leading to changes in aquatic ecosystems, the death of plankton, and impacts on fish reproduction. Acid rain harms forests, damages soil, and reduces crop yields. It also corrodes stone carvings and buildings. High concentrations of sulfur dioxide in the air can cause conjunctivitis and acute bronchitis. Extremely high concentrations can lead to glottic edema, pulmonary edema, and respiratory paralysis.

[0004] In the mining and smelting industry, a single flue gas acidification system typically uses a high-power fan to transport SO2-containing flue gas to the sulfuric acid production system. Through a series of reactions, sulfuric acid is converted into sulfuric acid. The exhaust gas is then absorbed with hydrogen peroxide to ensure that SO2 emissions are reduced and meet environmental protection requirements. Typically, a single fan is used for transport. When the flue gas volume is large, a smaller fan is added before the absorption tower, installed at the acid production outlet, to transport the exhaust gas to the exhaust gas absorption tower.

[0005] Generally, SO2 can be used in acid production, containing a certain concentration. Among the "three wastes" emitted by acid production plants, waste gas, wastewater, and waste residue are gradually being reduced and recycled as resources. Flue gas with extremely low SO2 concentrations can be discharged after desulfurization to meet national and regional emission limits. If the main fan in the acid production plant of the smelting system is underloaded and the suction force is insufficient, a large amount of SO2 will be released into the environment in the smelting area, causing pollution to the surrounding area. When the smelting is running at low load, the main fan suction force is too strong, sucking in a large amount of air, resulting in a low SO2 concentration in the process flue gas, affecting the stability and efficiency of the acid production system. The purification and dry suction processes in the acid production system reduce the opening of the degassing valve, which will inevitably lead to insufficient degassing, inhibiting degassing efficiency and causing SO2 to harm the on-site environment. In smelting, a single acid production system produces over 1 million tons annually, resulting in a significant flue gas volume. Currently, the world's largest fans barely manage to transport flue gas to the acid production system. Because the acid production tail gas needs to absorb SO2, the tail gas absorption tower creates a certain resistance. Therefore, a certain negative pressure is required at the sulfuric acid production system outlet to prevent some SO2 from overflowing. However, excessive negative pressure at this location prevents the SO2 from fully reacting in the sulfuric acid production system, resulting in high SO2 levels in the tail gas and increasing the cost of the tail gas desulfurization system. At the smelter outlet, a slight negative pressure is generally maintained to prevent flue gas from overflowing, while also preventing excessive air from entering. A certain negative pressure is also maintained at the acid production tail gas outlet to ensure smooth flow throughout the flue gas system and sufficient SO2 conversion in the sulfuric acid production system. Smelter performance can be unstable, and operating at low load significantly reduces flue gas volume. Two different fans are located in different areas, and the two negative pressure control points are located in the same flow system. Manual control is generally difficult to meet production needs.

[0006] Based on production and operations, pressure gauges are installed at the smelting furnace and acid plant negative pressure monitoring points, and these pressure parameters are transmitted to the intelligent processing system. Two fans are controlled by variable frequency drives. The intelligent processing system sets control ranges for the two negative pressure control points. When the control range is exceeded, the intelligent processing system automatically adjusts the frequency of the two fans, achieving intelligent negative pressure control and ensuring stable production operations.

[0007] This method addresses the previously mentioned challenges of manually controlling the negative pressure in the sulfuric acid system and smelting furnace, achieving intelligent control of the flue gas system's negative pressure. This solves the environmental pollution issues plaguing the company, transforms waste into valuable resources, increases the company's economic benefits, and plays a significant role in its long-term development. Utility Model Content

[0008] In order to solve the above technical problems, the utility model provides an intelligent balancing system for conveying acid-making flue gas process.

[0009] The technical solution of the utility model is: an intelligent balancing system for conveying acid-making flue gas, comprising: a smelting system, a main fan connected to the smelting system is provided on one side of the smelting system, a sulfuric acid-making system connected to the main fan is provided on one side of the main fan, a tail gas desulfurization system connected to the sulfuric acid-making system is provided on one side of the sulfuric acid-making system, a chimney connected to the tail gas desulfurization system is provided on one side of the tail gas desulfurization system; an auxiliary fan is provided between the sulfuric acid-making system and the tail gas desulfurization system, a main frequency converter is connected to the main fan, an auxiliary frequency converter is provided on the auxiliary fan, and the main frequency converter is provided on the auxiliary fan. The inverter and the auxiliary frequency converter are both connected to the intelligent processing system. A smelting negative pressure meter is provided between the smelting system and the main fan, and the smelting negative pressure meter is used to detect the negative pressure value of the main fan; an acid-making negative pressure meter is provided between the sulfuric acid-making system and the auxiliary fan, and the acid-making negative pressure meter is used to detect the negative pressure value between the auxiliary fan and the sulfuric acid-making system. The smelting negative pressure meter and the acid-making negative pressure meter are both connected to the intelligent processing system signal. The intelligent processing system autonomously regulates the main fan and the auxiliary fan through the signals collected by the smelting negative pressure meter and the acid-making negative pressure meter.

[0010] Furthermore, the main fan and the auxiliary fan are both ACSO2 fans.

[0011] Furthermore, the intelligent processing system is a PLC controller.

[0012] Compared with the prior art, the utility model has the following beneficial effects: simple structure, easy operation, the negative pressure values of the sulfuric acid production system and the smelting system are monitored by the acid production negative pressure meter and the smelting negative pressure meter, and the negative pressure value parameters are transmitted to the intelligent processing system, and the main fan and the auxiliary fan are controlled by frequency conversion; the intelligent processing system sets the control range of the two negative pressure value control points. When it is not within the control range, the intelligent processing system automatically adjusts the frequency conversion of the two fans to realize intelligent regulation of the negative pressure; ensures that the negative pressure of the entire system is stable, the smelting furnace outlet is slightly negative, and there is no smoke overflow; the acid production outlet has sufficient negative pressure to draw the removed SO2 gas to the hydrogen peroxide system of the tail gas desulfurization system, ensuring the stable operation of the main system fan, and at the same time, the dilute sulfuric acid produced by the hydrogen peroxide desulfurization of the removed SO2 gas returns to the dry absorption system to ensure production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the layout principle of the utility model;

[0014] 1. Smelting system; 2. Main fan; 3. Sulfuric acid production system; 4. Tail gas desulfurization system; 5. Chimney; 6. Auxiliary fan; 7. Smelting negative pressure gauge; 8. Main inverter; 9. Intelligent processing system; 10. Auxiliary inverter; 11. Acid production negative pressure gauge. DETAILED DESCRIPTION

[0015] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0016] Example 1:

[0017] like Figure 1 As shown: An intelligent balancing system for conveying acid-making flue gas process, comprising: a smelting system 1, a main fan 2 connected to the smelting system 1 is provided on one side of the smelting system 1, a sulfuric acid production system 3 connected to the one side of the main fan 2, a tail gas desulfurization system 4 connected to the one side of the sulfuric acid production system 3, a chimney 5 connected to the one side of the tail gas desulfurization system 4; an auxiliary fan 6 is provided between the sulfuric acid production system 3 and the tail gas desulfurization system 4, a main frequency converter 8 is connected to the main fan 2, an auxiliary frequency converter 10 is provided on the auxiliary fan 6, the main frequency converter 8 and the auxiliary frequency converter 10 are connected to each other. 0 are both connected to the intelligent processing system 9, a smelting negative pressure meter 7 is provided between the smelting system 1 and the main fan 2, and the smelting negative pressure meter 7 is used to detect the negative pressure value of the main fan 2; an acid-making negative pressure meter 11 is provided between the sulfuric acid-making system 3 and the auxiliary fan 6, and the acid-making negative pressure meter 11 is used to detect the negative pressure value between the auxiliary fan 6 and the sulfuric acid-making system 3, the smelting negative pressure meter 7 and the acid-making negative pressure meter 11 are both signal-connected to the intelligent processing system 9, and the intelligent processing system 9 autonomously regulates the main fan 2 and the auxiliary fan 6 through the signals collected by the smelting negative pressure meter 7 and the acid-making negative pressure meter 11.

[0018] In this embodiment, the main fan 2 and the auxiliary fan 6 are both ACSO2 fans.

[0019] In this embodiment, the intelligent processing system 9 is a PLC controller.

[0020] Compared with the prior art, the utility model has the following beneficial effects: simple structure, easy operation, the negative pressure values of the sulfuric acid production system 3 and the smelting system 1 are monitored by the acid production negative pressure meter 11 and the smelting negative pressure meter 7, and the negative pressure value parameters are transmitted to the intelligent processing system 9, and the main fan 2 and the auxiliary are controlled by frequency conversion; the intelligent processing system 9 sets the control range of the two negative pressure value control points. When it is not within the control range, the intelligent processing system 9 automatically adjusts the frequency conversion of the two fans to realize intelligent regulation of the negative pressure; ensures that the negative pressure of the entire system is stable, the smelting furnace outlet is slightly negative, and there is no smoke overflow; the acid production outlet has sufficient negative pressure to draw the removed SO2 gas to the tail gas desulfurization system 4 hydrogen peroxide system, ensuring the stable operation of the main system fan, and at the same time, the removed SO2 gas is desulfurized with hydrogen peroxide, and the dilute sulfuric acid produced is returned to the dry absorption system to ensure production.

Claims

1. An intelligent balancing system for conveying acid-making flue gas, comprising: A smelting system, wherein a main fan is provided on one side of the smelting system and is connected to the main fan, a sulfuric acid production system is provided on one side of the main fan and is connected to the sulfuric acid production system, a tail gas desulfurization system is provided on one side of the sulfuric acid production system and is connected to the tail gas desulfurization system, and a chimney is provided on one side of the tail gas desulfurization system and is connected to the tail gas desulfurization system; characterized in that an auxiliary fan is provided between the sulfuric acid production system and the tail gas desulfurization system, a main frequency converter is connected to the main fan, an auxiliary frequency converter is provided on the auxiliary fan, both the main frequency converter and the auxiliary frequency converter are connected to the intelligent processing system, a smelting negative pressure gauge is provided between the smelting system and the main fan, and the smelting negative pressure gauge is used to detect the negative pressure value of the main fan; an acid production negative pressure gauge is provided between the sulfuric acid production system and the auxiliary fan, and the acid production negative pressure gauge is used to detect the negative pressure value between the auxiliary fan and the sulfuric acid production system, both the smelting negative pressure gauge and the acid production negative pressure gauge are connected to the intelligent processing system signal, and the intelligent processing system autonomously regulates the main fan and the auxiliary fan through signals collected by the smelting negative pressure gauge and the acid production negative pressure gauge.

2. The intelligent balancing system for acid-making flue gas process transportation according to claim 1, characterized in that: The main fan and the auxiliary fan are both ACSO2 fans.

3. The intelligent balancing system for conveying acid-making flue gas according to claim 1, characterized in that: The intelligent processing system is a PLC controller.

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