阅读说明：本技术 一种控制冷轧机组乳化液异味及油雾排放的设备及方法 (Device and method for controlling peculiar smell and oil mist emission of cold rolling mill unit emulsion ) 是由 王康健 瞿培磊 于 2019-03-19 设计创作，主要内容包括：本发明公开了一种控制冷轧机组乳化液异味及油雾排放的设备及方法,包括冷轧机,还包括通过抽风管道与所述冷轧机相连的洗涤装置,洗涤装置设置呈文丘里结构,其内设有若干个用以喷射洗涤水的喷嘴,所述洗涤装置连接有缓冲装置,缓冲装置内部为中空设置,缓冲装置依次再连有风机、烟囱,所述洗涤装置与缓冲装置之间还通过循环装置相连通。本发明能够有效实现油雾不超标的排放,并从根本上避免了轧制油在过滤网上蓄积变质散发恶臭异味的问题。(The invention discloses equipment and a method for controlling peculiar smell and oil mist emission of emulsion of a cold rolling unit, wherein the equipment comprises a cold rolling mill and a washing device connected with the cold rolling mill through an exhaust pipeline, the washing device is in a Venturi structure and is internally provided with a plurality of nozzles for spraying washing water, the washing device is connected with a buffer device, the interior of the buffer device is hollow, the buffer device is sequentially connected with a fan and a chimney, and the washing device and the buffer device are communicated through a circulating device. The invention can effectively realize the emission of oil mist without exceeding the standard, and fundamentally avoids the problem that rolling oil is accumulated on a filter screen to deteriorate and emit odor and peculiar smell.)

1. The utility model provides a control cold rolling mill group emulsion peculiar smell and oil mist discharge's equipment, includes the cold rolling mill, its characterized in that: still include through the exhaust duct with the washing device that the cold rolling mill links to each other, washing device sets up and is the venturi structure, is equipped with the nozzle that a plurality of is used for spraying the washing water in it, washing device is connected with buffer, and buffer is inside to be the cavity setting, and buffer has fan, chimney again in proper order, still be linked together through circulating device between washing device and the buffer.

2. The apparatus for controlling the emission of the odor and the oil mist of the emulsion of the cold rolling mill train as set forth in claim 1, wherein: the cold rolling mill is a reversible rolling mill or a cold continuous rolling mill.

3. The apparatus for controlling the emission of the odor and the oil mist of the emulsion of the cold rolling mill train as set forth in claim 1, wherein: the washing device is in a circular tube shape, an inlet end on the washing device is connected with the air suction pipeline, an outlet end on the washing device is connected with the buffer device, and a Venturi structure on the washing device, specifically, a throat structure with a gradually reduced diameter is arranged in the middle of the washing device.

4. The apparatus for controlling the emission of the odor and the oil mist of the emulsion of the cold rolling mill train as set forth in claim 3, wherein: the nozzle is arranged on the throat structure.

5. The apparatus for controlling the emission of the odor and the oil mist of the emulsion of the cold rolling mill train as set forth in claim 4, wherein: the nozzle is communicated with the circulating device.

6. The apparatus for controlling the emission of the odor and the oil mist of the emulsion of the cold rolling mill train as set forth in claim 3, wherein: the diameter of the two end parts of the washing device is 1.3-3.5 times of the diameter of the throat structure.

7. The apparatus for controlling the emission of the odor and the oil mist of the emulsion of the cold rolling mill train as set forth in claim 1, wherein: and the circulating device is also connected with a water replenishing pipe and a water draining pipe.

8. A method of controlling cold mill train emulsion odor and oil mist emission as claimed in any one of claims 1 to 7, wherein:

the emulsified liquid gas generated in the production of the cold rolling mill enters the washing device from the inlet end through the air exhaust pipeline, the nozzle continuously sprays washing water to wash and purify the emulsified liquid gas, so that a large amount of lubricating oil, dirt, emulsified liquid drops and part of emulsified liquid odor and peculiar smell objects in the emulsified liquid gas are washed and flow to the buffer device together with the washing water to be settled and collected, the purified emulsified liquid gas is sucked by the fan and then enters the subsequent chimney to be discharged, the washing water collected in the buffer device flows into the circulating device, and the washing water is circulated to the nozzle by the circulating device to be continuously sprayed in a circulating mode.

9. The method of claim 8, wherein the step of controlling the emission of the off-flavor and oil mist from the cold mill train emulsion comprises the steps of: the spraying pressure of the nozzle is 3-8 bar, and the flow rate is 0.6-3 m³/min。

10. The method of claim 8, wherein the step of controlling the emission of the off-flavor and oil mist from the cold mill train emulsion comprises the steps of: the washing water is industrial desalted water, and preferably 0.1-5% of NaOH and Na can be mixed in₂S₂O₃、H₂O₂。

Technical Field

The invention relates to the technical field of cold rolling, in particular to equipment and a method for controlling peculiar smell of emulsion and oil mist discharge of a cold rolling unit.

Background

In the production process of modern steel products, cold rolling is usually performed on steel strips by using a cold rolling mill, and the so-called cold rolling is a process of rolling steel strips into products with certain thickness requirements at a recrystallization temperature of the steel products at normal temperature by using a roller. In order to reduce friction and energy consumption during production, emulsion is generally sprayed on the rollers and the strip steel for production. The emulsion is a chemical mixture consisting of 1-3% of lubricating rolling oil and the balance of water, and has a lubricating and cooling effect on the surfaces of a roller and a strip during rolling.

Because the production speed in the cold rolling process is very high (more than 1000m/min), the strip steel and the roller can generate heat obviously, and the dosage of the emulsion in the production is very large (usually 10 m/min)³/min～40m³Min), so that a large amount of emulsion splashes and evaporates in cold rolling equipment, a lot of waste liquid is produced, and in order to ensure the quality of products, reduce environmental pollution and meet the requirements of environmental regulations on oil mist emission, the cold rolling machine is provided with an air draft system to filter and treat emulsion gas.

As shown in figure 1, in order to prevent the emulsion from polluting the environment, the cold rolling equipment 1 is integrally installed in a closed cover body structure 2 during production, an air suction pipeline 3 is installed at the top of the cold rolling equipment to suck away splashed and evaporated emulsion and the like, and in order to ensure the emulsion gas suction effect, the amount of the sucked gas is very large and reaches (2-4) × 10⁵m³H is used as the reference value. The gas entering the air suction pipeline 3 contains a large amount of emulsified liquid drops, water, lubricating oil, iron powder and dirt, in order to reduce the oil mist content in the gas and meet the requirements of national regulations, a special filtering device 4 is installed on the air suction pipeline 3 to filter the substances, materials such as 2-4 layers of baffles, metal filter screens or filter cloth are usually used for filtering and intercepting in the air suction pipeline, however, as the service life is prolonged (generally 2-3 months), the filter screens are gradually filled with the pollutants, the filtering function is slowly weakened, and part of the lubricating oil and the dirt are sucked by a rear fan 5 and discharged into the air, so that the discharge pollution of the oil mist is caused. In addition, the pollutants such as lubricating oil and emulsion in the filtering device 4 breed a large amount of bacteria in long-term hot and humid conditions, generate extremely uncomfortable 'peculiar smell and stink' of the emulsion, and float to the surrounding environment along with the chimney 6, so that the problem of environmental pollution caused by the peculiar smell is caused.

For the emission of the above-mentioned peculiar smell, offensive odor and oil mist, the national environmental protection department has strict laws and regulations, and generally for cold rolling mills, the latest requirement for the oil mist emission concentration at the emulsion gas emission chimney port needs to be metLess than 20mg/m³And the odor of the emulsion gas needs to be lower than 1000. Usually, after a period of continuous production, the rolling mill is difficult to continuously meet the standard due to the change of the filtering capacity, so that for the cold rolling production, the filtering equipment must be frequently stopped and cleaned, which also causes a great loss of capacity.

Based on the above, in the prior patent applications related to the production technology of equipment and process in the field, the following aspects are mainly gathered:

patent application No. 201810372720.9 (an oil mist dust collector) proposes an effective oil mist treatment technique, which adopts three-stage oil mist treatment, and combines a filter screen and a centrifugal separator to efficiently remove the oil mist.

Patent application No. 201510362874.6 (a cold rolling emulsion peculiar smell gas purification device and method) has proposed another kind of device and method that effectively defogged and reduce the peculiar smell, the core is that send the emulsion gas that contains the oil mist into filtration formula and centrifugal defogging device at first and get rid of the oil mist, then let in the gas after preliminary purification active carbon layer and adsorb, wash through chemical treatment liquid afterwards, gas oil mist and peculiar smell stench of gas of last exhaust can not exceed standard, although this kind of technique effectively avoids the emission problem of cold rolling oil mist and peculiar smell stench, but the whole process is very complicated, the application is centrifugal, many technical combinations of filtration and chemistry, and for example filter media such as active carbon need be changed in the long-term use, the use cost that produces also is difficult to reduce, technological popularization nature and economic nature have been hindered.

Patent application No. 200510020326.1 (an oil mist purification unit) proposes an oil mist treatment device using a combination of a readily detachable metal stainless steel baffle and a metal filter screen, and simultaneously, the use of high-temperature steam is matched to reduce the peculiar smell generated by bacteria on the filter screen. The technology is based on the existing cold rolling filtering equipment, can realize the quick disassembly and assembly of the filtering equipment and reduce the generation of peculiar smell, but still needs to disassemble and wash the filtering equipment regularly, and the rolling mill is stopped when the filtering equipment is disassembled and assembled every time, and in addition, the application of high-temperature steam is still difficult to fundamentally avoid the generation of peculiar smell and stink.

Patent application No. 201510190717.1 (integrated form foul smell purifier) proposes a kind of equipment and technique for handling gaseous foul smell, mainly uses low temperature condensation to purify various kinds of foul smell thing, then uses plasma to decompose the deodorization to gaseous, and this kind of mode can get rid of the foul smell material very effectively, but the occupation of land of whole equipment is very huge, and the running cost of long-term technology is very high, and equipment investment is also very huge. Affecting the feasibility of application in the production field of the cold-rolling mill train.

Patent application No. 201711093064.0 (rubbish transfer station foul smell clean system), propose another kind and handle the equipment and the technique of foul smell in rubbish transfer station the inside, mainly be exactly in the foul smell gaseous suction of rubbish transfer station through the fan special negative pressure pipeline, carry out the elimination of foul smell through ultraviolet treatment equipment, this kind of method also can reduce all kinds of foul smell, but to the equipment of cold rolling mill, it is huge mainly in emulsion suction gas volume, for guaranteeing the deodorization effect, need install a large amount of ultraviolet treatment equipment, this technique is unable to carry out effective processing to the oil mist simultaneously, consequently holistic validity and operation economic nature are difficult to obtain the assurance.

Patent application No. 201810179536.2 (integrated processing device for foul odor gas), another technology for processing foul odor gas is proposed, which is to pump various gases with foul odor into a series of combined devices, including biological absorption, filtration, activated carbon adsorption and aeration devices, the content of the invention combines various technologies for effectively processing foul odor, so as to process various foul odors to the maximum extent, and the filtering device can also effectively eliminate oil mist, but as mentioned above, the cold rolling production unit has huge gas flow, if the combined processing device is adopted, the volume of the whole device is huge, and the system cost is also huge, so it is difficult to use in the cold rolling unit.

Therefore, the above patent mainly aims at the conventional treatment of various oil mists and odor gases, and although various problems can be solved effectively in the technology, the technology is used in a cold rolling mill, and the characteristics of cold rolling emulsion, lubricating oil and dirt and the background condition of odor generation are not considered. Therefore, the problems of high equipment cost, difficult operation and maintenance and huge equipment volume exist, and the direct application on the cold rolling mill is difficult.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide equipment and a method for controlling the peculiar smell of the emulsion of the cold rolling unit and the emission of oil mist, which can effectively realize the emission of the oil mist without exceeding the standard and fundamentally avoid the problem that the rolling oil accumulates on a filter screen, deteriorates and emits the odor and peculiar smell.

In order to achieve the purpose, the invention adopts the following technical scheme:

on the one hand, a control cold rolling unit emulsion peculiar smell and oil mist discharge's equipment, including the cold rolling mill, still include through the exhaust duct with the washing device that the cold rolling mill links to each other, the washing device setting is the venturi structure, is equipped with the nozzle that a plurality of is used for spraying the washing water in it, washing device is connected with buffer, and buffer is inside to be the cavity setting, and buffer has fan, chimney again in proper order, still be linked together through circulating device between washing device and the buffer.

The cold rolling mill is a reversible rolling mill or a cold rolling mill.

The washing device is in a circular tube shape, an inlet end on the washing device is connected with the air suction pipeline, an outlet end on the washing device is connected with the buffer device, and a Venturi structure on the washing device, specifically, a throat structure with a gradually reduced diameter is arranged in the middle of the washing device.

The nozzle is arranged on the throat structure.

The nozzle is communicated with the circulating device.

The diameter of the two end parts of the washing device is 1.3-3.5 times of the diameter of the throat structure.

And the circulating device is also connected with a water replenishing pipe and a water draining pipe.

On the other hand, a method for controlling the peculiar smell and the oil mist discharge of the emulsion of the cold rolling mill group comprises the following steps:

the emulsified liquid gas generated in the production of the cold rolling mill enters the washing device from the inlet end through the air exhaust pipeline, the nozzle continuously sprays washing water to wash and purify the emulsified liquid gas, so that a large amount of lubricating oil, dirt, emulsified liquid drops and part of emulsified liquid odor and peculiar smell objects in the emulsified liquid gas are washed and flow to the buffer device together with the washing water to be settled and collected, the purified emulsified liquid gas is sucked by the fan and then enters the subsequent chimney to be discharged, the washing water collected in the buffer device flows into the circulating device, and the washing water is circulated to the nozzle by the circulating device to be continuously sprayed in a circulating mode.

The spraying pressure of the nozzle is 3-8 bar, and the flow rate is 0.6-3 m³/min。

The washing water is industrial desalted water, and preferably 0.1-5% of NaOH and Na can be mixed in₂S₂O₃、H₂O₂。

In the technical scheme, the equipment and the method for controlling the peculiar smell of the emulsion of the cold rolling mill set and the emission of the oil mist adopt water or trace chemical reagents to wash the traditional emulsion gas, and because the emulsion used for cold rolling contains a large amount of emulsifying agents, dirt, the oil mist and the like contained in the cold rolling emulsion gas are easy to remove by washing a large amount of circulating water, so that the effect that the oil mist does not exceed the standard is realized; meanwhile, the existing invention has no filtering system and filtering net structure, thus fundamentally avoiding the problems that the rolling oil is accumulated on the filtering net to deteriorate and emit odor and peculiar smell, the whole process equipment is simple, and the complex treatment equipment is not needed when the rolling oil is normally used besides a large amount of water and a small amount of chemical reagent, thereby effectively ensuring the cost and the economy.

Drawings

FIG. 1 is a schematic diagram of a prior art cold mill train emulsion gas filtration system;

FIG. 2 is a schematic diagram of the apparatus for controlling the emission of the odor and oil mist of the emulsion of the cold rolling mill train according to the present invention;

fig. 3 is a schematic view of the drain washer apparatus of fig. 2.

Detailed Description

The technical scheme of the invention is further explained by combining the drawings and the embodiment.

Referring to fig. 1 to 2, the apparatus for controlling the odor of the emulsion and the oil mist emission in the cold rolling mill set according to the present invention includes a cold rolling mill 10, wherein the cold rolling mill 10 refers to a reversible rolling mill and a cold tandem rolling mill, and the number of the cold rolling mill stands may be 4, 6, 12, 18 or 20.

Also comprises a washing device 12 connected with the cold rolling mill 10 through an air exhaust pipeline 11, the washing device 12 is arranged in a Venturi structure, a plurality of nozzles 13 for spraying washing water are arranged in the washing device, the outlet end of the washing device 12 is connected with a buffer device 14, the buffer device 14 is arranged in a hollow way and plays a role in reducing the flow velocity of emulsion gas so as to settle and collect the water brought by the washing device 12 in front, the buffer device 14 is sequentially connected with a fan 15 and a chimney 16, the washing device 12 is communicated with the buffer device 14 through a circulating device 17, the washing water collected in the buffer device 14 flows into the circulating device 17, then the washing water in the circulating device 17 is sprayed into the washing device 12 for use in a circulating mode, and the purified emulsion gas is sucked into a subsequent chimney 16 through a suction pipe 15 to be discharged, so that the emission standards of oil mist and emulsion peculiar smell can be met simultaneously.

The biggest difference between the equipment for controlling the peculiar smell and oil mist discharge of the emulsion of the cold rolling mill set and the traditional emulsion gas filtering device is that the invention cancels the method of a mechanical filter screen or a filter baffle in the traditional emulsion gas treatment process, and uses a washing device 12 with circulating water jet flushing instead, and adopts the water washing method to treat the emulsion gas, the washing device 12 is in a round tube shape, adopts a Venturi structure, and an internal nozzle 13 continuously sprays large-flow circulating water to wash various rolling oil drops and dirty dirt in the emulsion gas, because the oil drops and the dirty in the emulsion gas come from cold rolling lubricating oil and contain emulsifier, the pollutants are easy to enter washing water, because the washing water part sprayed in the washing device 12 is sprayed and atomized into the emulsion gas by the nozzle 13, a buffer device 14 is arranged behind the washing device 12, the interior of the buffer device 14 does not contain any filtering mechanical structure, but is a hollow device, and the flow velocity of the emulsion gas is greatly reduced after the emulsion gas enters the buffer device by utilizing the huge space of the buffer device, and most of washing water, cold-rolled oil drops, dirt and the like in the gas can slowly settle and flow out, and then the washing water, the cold-rolled oil drops, the dirt and the like flow into the circulating device 17 for washing and utilization again. If the design of the buffer device 14 is not adopted, a problem that a large amount of moisture is sucked by the fan 15 and discharged from the chimney 16 is caused. The circulating device 17 is also connected with a water replenishing pipe and a water draining pipe, and in the using process of the device, the circulating device 17 discharges a part of waste water and replenishes clean water so as to avoid that cold rolling oil drops, dirt and the like are greatly enriched in the circulating device 17 to cause weakening of a washing effect. The device utilizes the principle that washing water is used for cleaning and removing oil mist, and meanwhile, the whole device does not contain any mechanical filtering device structure, so that the corruption and stink caused by the accumulation of cold rolling oil and dirt on the filter are fundamentally avoided, and the device also has the good effect of avoiding the peculiar smell of the emulsion.

As shown in fig. 3, the washing device 12 is preferably a venturi structure, specifically, the washing device 12 has an inlet through which the emulsion gas flows, the diameter of the inlet is D, the middle of the washing device 12 has a tapered throat structure, the diameter of the throat structure is D, the emulsion gas reaches the maximum flow velocity here, the static pressure here is the minimum, and a plurality of nozzles 13 are arranged on the throat structure, the washing circulating water is continuously sprayed, most of the emulsion droplets, the lubricating oil and the dirt particles in the emulsion gas enter the water to be washed down, and the emulsion droplets, the lubricating oil and the dirt particles flow into the subsequent buffer device 14 to be discharged along the pipe wall. The gas then flows through the subsequent gradually expanding structure and exits at the outlet of the washing device 12, the diameter of which is D, where the gas flow rate is reduced while continuing to be reduced in the subsequent buffer device 14, a small portion of the emulsion droplets, lubricating oil, dirt particles and water particles still present in the gas eventually settling down due to the principle of gravity difference and flowing back to the circulation device 17 along with the washing water.

Here, adopt venturi structure washing to handle the emulsion gas, adopt the structure of the convergent throat at middle part, make gas obtain very big increase at this place velocity of flow, according to the thermodynamic principle, the gaseous temperature of emulsion can obtain 3 ~ 8 ℃ of reduction, cold rolling oil in the emulsion gas drips and the dirty change is condensed in this moment, it washes the degree of difficulty that gets into circulating device 17 by a large amount of washing water to have reduced, back end export part pipe diameter at the throat structure grow gradually again, the gas flow velocity can slowly increase again, by atomizing washing water in the emulsion gas this moment, cold rolling oil drips and dirty etc. easily subsides again, leave from the emulsion gas.

The invention also provides a method for controlling the peculiar smell of the emulsion of the cold rolling unit and the emission of oil mist, which comprises the following steps:

emulsion gas generated in production of the cold rolling mill 10 enters the washing device 12 from the inlet end through the air exhaust pipeline 11, the nozzle 13 continuously sprays washing water to wash and purify the emulsion gas, so that a large amount of lubricating oil, dirt, emulsion liquid drops and part of emulsion odor and smell objects in the emulsion gas are washed and flow into the buffer device 14 together with the washing water to be settled and collected, the purified emulsion gas is sucked by the fan 15 and then enters the subsequent chimney 16 to be discharged, the washing water collected in the buffer device 14 flows into the circulating device 17, and the washing water is circulated to the nozzle 13 by the circulating device 17 to be continuously and circularly sprayed.

The diameter D of the inlet/outlet of the washing device 12 is 1.3-3.5 times of the diameter D of the throat, the injection pressure of the nozzle 13 at the throat is 3-8 bar, and the flow rate is preferably 0.6-3 m³And/min.

The circulating device 17 receives the washing circulating water flowing out of the buffer device 14 in the using process, sprays the washing circulating water to the washing device 12 for repeated use, and discharges waste water, wherein the amount of the waste water is preferably 0.1-0.4 m³Between/min, fresh water can be added as required through a water replenishing pipe in order to maintain the liquid level in the circulating device 17.

The volume of the buffer device 14 is preferably 8-20 m³In the meantime.

The washing water used in the treatment process is industrial desalted water, and for further improvementFor removing oil mist and peculiar smell, preferably, 0.1-5% of NaOH and Na are added into the circulating device 17 according to the mass percentage₂S₂O₃、H₂O₂。