Steelmaking process unorganized emission acoustic agglomeration treatment system

Abstract

The utility model provides a steelmaking process unorganized emission sound wave agglomeration treatment system, which comprises a gas inlet system, a spraying system, a composite sound wave dust remover and an emission system, the composite sound wave dust remover is used for carrying out dust removal treatment on steelmaking process unorganized emission waste gas supplied by the gas inlet system, and the composite sound wave dust remover comprises an agglomeration tower body; pipe removing systems, spraying systems and a sound wave generating device are arranged in the tower body, the pipe removing systems are distributed in the composite sound wave dust remover layer by layer, and a group of spraying layers are arranged on the upper portion and the lower portion of each layer of pipe removing system respectively. According to the system, on one hand, Fe dust is captured and removed, the dust removal efficiency is improved, and the ultra-low emission standard is achieved; meanwhile, Fe dust deposition and blockage are avoided, so that the system resistance is reduced, the running current of the fan is reduced, and the power consumption is saved. Through the means, the environment-friendly benefit, the safety benefit and the energy-saving economic benefit of the operation of the ironmaking plant are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting waste gas treatment systems, in particular to a sound wave agglomeration treatment system for unorganized emissions from steelmaking processes. Background Art

[0002] Generally speaking, in the sintering process of an ironmaking plant, belt conveyor equipment, sintering machines, mixers, etc., will produce a large amount of gas containing steam and dust. The waste gas has the following characteristics:

[0003] 1. The sintering mixed flue gas is affected by the process operation and raw material conditions, and the climate temperature, so the flue gas volume is not stable and fluctuates greatly;

[0004] 2. The dust concentration in the flue gas exceeds the standard and fluctuates widely. According to the reference data of other steel mills, even the lower level exceeds the national standard of 30mg / Nm 3 Limits;

[0005] 3. The humidity content in the flue gas is high, fluctuating between 5% and 10%;

[0006] 4. Dust has strong adhesion and is easy to adhere to the inner wall of the pipe and the inner wall of the equipment;

[0007] 5. The quicklime content in the flue gas is high, accounting for more than 30% of the dust weight;

[0008] And the particulate matter it emits often contains a large amount of iron oxides, such as FeO, Fe2O, etc. For example, the iron oxide content in the dust of an iron smelting plant can reach 48% to 55%.

[0009] Due to the characteristics of the above equipment production, the flue gas treatment control system becomes more complicated. In addition, the FeO and Fe2O3 content in the flue gas is high and the humidity is high, which makes the flue gas dust density high and easy to deposit and clog, further affecting the dust removal efficiency of the dust removal equipment and even affecting the safe production of the iron and steel making system.

[0010] Domestic steel enterprises generally use gravity dust removal, wet dust removal, plastic sintered plate dust removal and bag dust removal to treat the flue gas generated by mixers.

[0011] Gravity dust removal has low filtration efficiency and poor dust removal effect, and cannot meet the ultra-low emission requirements for dust removal and has been eliminated.

[0012] When plastic sintered board dust removal is used to treat dusty gases with high relative humidity and high quicklime concentration, it is easy to cause blockage and requires a lot of operation and maintenance. The requirement for treating flue gas temperature is <70°C. When the flue gas temperature is higher than the design operating conditions, the filter element is prone to deformation and the replacement rate of spare parts is high.

[0013] Bag dust collectors have high dust removal efficiency and can meet the dust emission limit requirements. However, the flue gas emitted by the mixer has a high relative humidity and a high concentration of quicklime, which can easily cause the filter bags to become compacted and "sticky". The operating and maintenance costs are high, and it cannot operate stably for a long time. Utility Model Content

[0014] The purpose of the utility model is to provide a sonic agglomeration control system for unorganized emissions in steelmaking processes. The system of the utility model is suitable for ironmaking equipment such as sintering machines, mixers, electric furnaces, coke ovens, blast furnaces, and converters, and is particularly suitable for the treatment of tail gas from the steam vent pipe of a sintering machine mixer in the ironmaking process of an ironmaking plant.

[0015] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0016] A sonic agglomeration treatment system for unorganized emissions from a steelmaking process comprises an air intake system, a spray system, a composite sonic dust collector and an emission system, wherein the air intake system supplies waste gas to an air intake of the composite sonic dust collector, the spray system provides water for spraying, the composite sonic dust collector performs dust removal treatment on the unorganized emissions from the steelmaking process supplied from the air intake system, the emission system comprises a waste gas emission mechanism and a waste water emission mechanism, the waste gas emission mechanism is drawn out from the top of the composite sonic dust collector to discharge the treated waste gas, the waste water emission mechanism is drawn out from the bottom of the composite sonic dust collector to discharge the sewage generated during the treatment process, the composite sonic dust collector comprises a condensation tower body, a pipe removal system, a spray system and a sonic wave generating device are arranged inside the tower body, wherein the pipe removal system is distributed in layers inside the composite sonic dust collector, and a group of spray layers are arranged above and below each layer of the pipe removal system.

[0017] Preferably, the pipe removal system has three layers, and the pipe removal length of each layer increases from top to bottom.

[0018] Preferably, the air intake system includes an air intake pipe, spray points are arranged at intervals in the pipe, and splash nozzles are arranged at the spray points to spray the dust-containing exhaust gas in the pipe.

[0019] Furthermore, the air intake duct is overall inclined from the dust generating point to the air intake of the composite sonic dust collector.

[0020] More preferably, the inclination angle is 3°.

[0021] Preferably, the exhaust gas discharge mechanism comprises an exhaust duct led out from the top of the composite acoustic wave dust collector, on which an induced draft fan and a muffler are arranged, and the exhaust gas is finally discharged through a chimney.

[0022] Preferably, the wastewater discharge mechanism includes a drainage pipe and a sewage pool led out from the bottom of the composite acoustic wave dust collector, and the wastewater in the sewage pool is discharged to the sewage treatment mechanism through a sewage pump.

[0023] Preferably, the spray system includes a clean water tank, a circulation pump and a spray pipe, and the spray pipe is further branched into a pipe for supplying water to the composite acoustic wave dust collector spray system and a pipe for supplying water to the air intake pipe spray point.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] 1. Aiming at the characteristics of high Fe content and small particle size in the flue gas of steel equipment such as blast furnaces, electric furnaces, and converters, this composite acoustic wave dust collector process system is designed to efficiently remove Fe dust in the flue gas;

[0026] 2. The use of the utility model for dust removal equipment for Fe-containing flue gas in ironmaking processes and equipment can avoid equipment shutdown and cleaning problems caused by dust accumulation, reduce a large amount of maintenance work, and reduce safety hazards caused by maintenance work;

[0027] 3. The system of the utility model is suitable for the treatment of tail gas from the steam emission pipe of the sintering machine mixer in the ironmaking process of the ironmaking plant. Through the spraying of the air intake pipe and the sonic dust removal, the flue can be kept unobstructed, the system resistance can be reduced, the fan current can be reduced, and the power consumption can be reduced;

[0028] 4. The system of the utility model is used for the exhaust gas treatment of the steam emission pipe of the sintering machine mixer in the ironmaking process of the ironmaking plant, which reduces the emission of particulate matter in the flue gas and achieves the environmental protection effect of ultra-low emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the system of the utility model.

[0030] In the figure: 1. Clean water tank; 2. Sewage tank; 3. Circulation pump; 4. Sewage pump; 5. Composite sonic dust collector; 6. induced draft fan; 7. Muffler; 8. Chimney. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In view of the deficiencies in the prior art, the utility model provides a dust removal system suitable for removing Fe-containing dust from the tail gas of the steam vent pipe of the sintering machine mixer in the ironmaking process of the ironmaking plant. The characteristics of the new device can be fully utilized, and a sealing cover, a dust collection pipeline, a spray system and a sonic agglomeration technology are adopted to capture and remove Fe dust, improve the efficiency of dust removal, and meet the ultra-low emission standards. At the same time, the system resistance is reduced by avoiding the blockage of Fe dust deposition, thereby reducing the operating current of the fan and saving power consumption. Through the above means, the environmental protection benefits, safety benefits, and energy-saving economic benefits of the operation of the ironmaking plant are improved.

[0035] See also Figure 1 The utility model discloses a sonic agglomeration treatment system for unorganized emissions in steelmaking process, which comprises an air intake system, a spray system, a composite sonic dust collector and an emission system.

[0036] The air intake system introduces unorganized exhaust gas, and the dust-containing gas collected from the sealing cover at the dust generating point enters the compound acoustic wave dust collector 5 through the dust removal pipe. A spray point is set every 5 meters in the dust collecting pipe, and the whole pipe is inclined at 3°. Through the splash nozzle spraying, the Fe-containing dust vapor is fully contacted with water to avoid clogging the pipe, and then enters the core equipment of the system, the compound acoustic wave dust collector 5, together.

[0037] The composite acoustic wave dust collector 5 is mainly composed of three layers of high-efficiency pipe filters (from top to bottom, the length of each layer of pipe filters increases), a spray system (each layer of pipe filters is provided with a group of spray layers above and below), and an acoustic wave generating device. The flue gas passes through the high-efficiency pipe filter, generating high-speed centrifugal motion. Under the action of centrifugal force, the particles move toward the inner wall of the pipe filter, collide with each other during the movement, and gather into larger particles. The particles are thrown to the inner wall surface of the pipe filter, thereby achieving the removal of particles. The acoustic wave vibration ash removal technology is based on the principle of high-intensity sound wave generation. By utilizing the discrete effect of sound waves, the ash and scale attached and bonded to the wall of the equipment can be broken by sound waves and then settled by gravity, thereby achieving the purpose of dust removal and collection, and improving the reliability and safety of the operation of related equipment. Most of the dust in the flue gas is removed under the action of the three-stage high-efficiency pipe filter and the spray system.

[0038] The spray water in the composite acoustic dust collector 5 absorbs dust and forms sewage, which is discharged from the sewage discharge system. The sewage discharge system pipeline is led out from the bottom of the composite acoustic dust collector 5, collected in the sewage pool 2, and sent to the sewage treatment process through the sewage pump 4.

[0039] The dust-removed flue gas is discharged through the exhaust gas discharge system. The exhaust gas discharge system includes an induced draft fan 6, a silencer 7, and a chimney 8. The dust-removed flue gas is finally discharged through the chimney in compliance with the standards under the action of the induced draft fan.

[0040] The spraying system supplies water for spraying of the spraying mechanism in the air intake system and the dust collector. The spraying system includes a clean water tank 1, a circulating pump 3 and a circulating pipeline. On one hand, a branch of the circulating pipeline supplies water for spraying of the dust collector spraying mechanism, and on the other hand, a branch of the circulating pipeline supplies water for spraying of the spraying point of the air intake system.

[0041] According to the characteristics of the steam flue gas from the mixer, after comparison, the most suitable process route for dust removal of the flue gas from the mixer is the wet dust collector. Among the wet dust collectors, the comparison of various indicators between the composite acoustic wave high-efficiency wet dust collector and the water bath dust collector is shown in the following table:

[0042] Table 1 Comparison of the indicators of composite acoustic wave high-efficiency wet dust collector and water bath dust collector

[0043] parameter Composite acoustic wave high efficiency wet dust collector Water bath dust collector Dust removal efficiency ≥98％ ≥90％ Emission indicators <![CDATA[<10mg / Nm 3 ]]> <![CDATA[30mg / Nm 3 Left and right]]> Dust collector body resistance ≦800Pa ≦2000Pa Fan full pressure 5000Pa 6000Pa Fan motor power ~400kW ~500kW Circulating water volume <![CDATA[~200m 3 / h]]> <![CDATA[~350m 3 / h]]> Water pump power consumption 130KW 200KW

[0044] Through comparison, the composite acoustic wave high-efficiency wet dust collector has obvious advantages in all technical and economic indicators.

[0045] The details not described in the present invention are all known technologies to those skilled in the art.

[0046] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A sonic agglomeration treatment system for unorganized emissions from steelmaking processes. It is characterized in that The system includes an air intake system, a spray system, a composite acoustic wave dust collector and an emission system, wherein the air intake system supplies exhaust gas to the air intake of the composite acoustic wave dust collector, the spray system provides water for spraying, the composite acoustic wave dust collector performs dust removal treatment on the unorganized exhaust gas emitted from the steelmaking process supplied from the air intake system, the emission system includes an exhaust gas emission mechanism and a wastewater emission mechanism, the exhaust gas emission mechanism is drawn out from the top of the composite acoustic wave dust collector to discharge the treated exhaust gas, and the wastewater emission mechanism is drawn out from the bottom of the composite acoustic wave dust collector to discharge the sewage generated during the treatment process, the composite acoustic wave dust collector includes a condensation tower body, and a pipe removal system, a spray system and a sound wave generating device are arranged inside the tower body, wherein the pipe removal system is distributed in layers inside the composite acoustic wave dust collector, and a group of spray layers are arranged above and below each layer of the pipe removal system.

2. The acoustic wave agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 1, It is characterized in that The pipe removal system has three layers, and the pipe removal length of each layer increases from top to bottom.

3. The acoustic wave agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 1, It is characterized in that The air intake system includes an air intake pipe, and spray points are arranged at intervals in the pipe. Splash nozzles are arranged at the spray points to spray the dust-containing exhaust gas in the pipe.

4. The acoustic wave agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 3, It is characterized in that The air intake duct is generally inclined from the dust generating point to the air intake of the composite acoustic wave dust collector.

5. The acoustic wave agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 4, It is characterized in that The tilt angle is 3°.

6. The acoustic wave agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 1, It is characterized in that The exhaust gas discharge mechanism comprises an exhaust duct led out from the top of the composite acoustic wave dust collector, on which an induced draft fan and a muffler are arranged, and the exhaust gas is finally discharged through a chimney.

7. The sonic agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 1, It is characterized in that The wastewater discharge mechanism includes a drainage pipe and a sewage pool led out from the bottom of the composite acoustic wave dust collector. The wastewater in the sewage pool is discharged to the sewage treatment mechanism through a sewage pump.

8. The sonic agglomeration treatment system for unorganized emissions from steelmaking process as claimed in claim 1, It is characterized in that The spray system includes a clean water tank, a circulation pump and a spray pipe. The spray pipe is further branched into a pipe for supplying water to the composite sonic dust collector spray system and a pipe for supplying water to the spray point of the air intake pipe.

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