CN103361165B - Regenerative equipment and method for waste emulsion produced in steel rolling process - Google Patents

Abstract

The invention provides regenerative equipment and method for a waste emulsion produced in a steel rolling process. The equipment comprises a feeding unit, a heating unit, a filtering and impurity removing unit, a thermal-chemical treatment unit and a product refining unit, wherein the filtering and impurity removing unit comprises a primary filter, a secondary filter and a magnetic filter which are connected with one another sequentially; the thermal-chemical treatment unit is used for performing thermal-chemical treatment on the heated and filtered waste emulsion, and comprises a first mixer, a first thermal precipitation tank, a second mixer and a second thermal precipitation tank; the first mixer is connected to the filtering and impurity removing unit, a demulsifier supply device and the first thermal precipitation tank; the second mixer is connected to a flocculant supply device, a first thermal precipitation tank and the second precipitation tank. By virtue of the equipment and the method, the waste emulsion produced in the steel rolling process can be processed and treated efficiently in accordance with the requirement on environment protection, so that regenerative fuel oil with stable quality can be obtained with a high recycling rate, and the difficulty of sewage treatment can be remarkably reduced.

Description

Apparatus and method for regeneration of waste emulsion produced in steel rolling process

technical field

The present invention generally relates to the treatment of emulsion, in particular, relates to the regeneration equipment and method of the waste emulsion produced in the steel rolling process.

Background technique

Rolling is a pressure processing process that uses rollers to roll metal blanks into various specifications of plates. Emulsions are usually used to cool and lubricate rolled pieces during steel rolling. Rolling emulsion requires good cooling and lubricating properties, chemical stability and anti-rust performance. It is based on mineral oil and added various additives to form anti-rust agents, emulsifiers, defoamers, antioxidants, etc. Chemically stable mineral oil-water mixture. The rolling emulsion will be subjected to high temperature and oxidation during use, and the intruded metal powder and water will gradually age and deteriorate the oil, so it must be replaced after a certain period of use. The chemical composition of the waste emulsion is complex, the content of water and impurities is high, the degree of emulsification is serious, and the chemical properties are stable, which brings great difficulties to subsequent treatment and reuse.

Specifically, the waste emulsion (or waste cold rolling oil) produced in the steel rolling process has the following characteristics:

(1) High water content: the water content of this waste emulsion is 20% to 70%, while the water content of other types of waste lubricating oil does not exceed 5%.

(2) High emulsifier content: Since the cold-rolled oil must have appropriate emulsification stability, the emulsifier content is 10% to 15%. High emulsifier content brings great difficulty to waste liquid dehydration.

(3) High content of sludge and gum: Due to the harsh working conditions of cold-rolled oil, the oil is repeatedly heated and cooled, which makes the oil easy to oxidize. At the same time, the high water content of the emulsion further promotes oxidation, and it is also vulnerable to microorganisms, so there are particularly many spoilage products in the waste emulsion.

According to the characteristics of the above-mentioned waste emulsion, the processing and treatment methods currently adopted in the industry are as follows.

Liu Jiafa and others (please refer to "Shanghai Chemical Industry" (2006, 31 (3): 1-3), "Study on the Regeneration Process of Baosteel 2030 Cold Rolling Waste Emulsion" for Baosteel 2030 Cold Rolling Waste Emulsion (with a water content of 20-80% , W/O type emulsion) the waste oil is regenerated by high-voltage electrostatic demulsification and chemical refining combination process, and the regenerated oil is used as fuel oil.

Sun Xiaofeng et al. (please refer to "Baosteel Technology", 2005, (3): 35-40, "Research and Application of Medium and High Viscosity Mixed Waste Oil Regeneration Process") for Baosteel's medium and high viscosity waste oil (water content 20-80%, W/ O-type emulsion) adopts a regeneration process combining flocculation-sedimentation, three-stage filtration and vacuum dehydration.

Tang Jianwei et al. ("Membrane Science and Technology", 2010, 30(1): 103-107, "Research Progress of Membrane Separation Technology in Waste Oil Regeneration") used 0.2μm ceramic membranes to conduct regeneration experiments on waste internal combustion engine oil. Studies have shown that ceramic membrane separation technology can effectively remove metal ions, mechanical impurities and moisture in waste oil. However, waste lubricating oil has high viscosity, high oil impurity content, low membrane filtration flux, serious membrane fouling and other problems, which severely limit the application of membrane separation technology in waste oil regeneration.

The waste emulsion regeneration process of a domestic factory adopts the following process:

Precipitation → centrifugal separation → coagulation refining → clay adsorption → filtration → base lubricating oil.

Precipitation: The purpose is to remove most of the water and impurities in the waste emulsion. The waste emulsion is heated to 60-80°C in a self-made heating precipitation tank, and the precipitation is 1-2 days, and the removal rate of water and impurities can reach 90%.

Centrifugal separation: After the waste emulsion is precipitated, oil, water and slag are further separated by a decanter centrifuge. The speed of the centrifuge is 1500-2000r/min, and the centrifugation time is 15-20min.

Coagulation refining: the purpose is to coagulate and flocculate insoluble substances such as colloids, asphaltene and hydrocarbon oxides, so as to precipitate and separate. Coagulation and refining process parameters are as follows: temperature is 60-70°C; stirring speed is 90-120r/min; flocculation reaction time is 8-10min; the amount of flocculant added depends on the colloid and asphalt contained in the waste emulsion The amount of insoluble matter and the viscosity of the oil.

Clay adsorption: further remove asphalt, colloid and other impurities in the oil through the adsorption of clay, and play a role in dehydration and decolorization. The process parameters are as follows: the temperature is preferably controlled at 120°C; the stirring speed is 90-120r/min; the amount of white clay is 5-10% of the oil weight; the reaction time is generally 30-60min.

Filtration: This is the final process of waste emulsion regeneration, and it is also the key link to remove clay, colloid and various impurities. The process adopts a plate and frame filter press, uses filter cloth as the medium, and purifies the oil through press filtration. In order to prevent the viscosity of the oil from increasing and blocking the filter cloth, the oil temperature is controlled at 100-140°C, and the filter pressure is 0.2-0.4MPa.

The oil recovered through the above process can be used as base lubricating oil.

In addition, adding sulfuric acid or phosphoric acid is currently the most common way in this field to treat waste emulsion, which will contain acids that are not conducive to the environment in the treated wastewater, and the quality and recovery rate of recovered oil are not high. .

To sum up, in the current domestic machinery and steel rolling industry, an efficient and environmentally friendly equipment and method has not been found to process and treat the waste emulsion produced in the steel rolling process.

Contents of the invention

In view of the above problems, the object of the present invention is to provide an efficient and environmentally friendly equipment and method for processing and treating waste emulsion produced in the rolling process.

In order to achieve the above object, the present invention provides a kind of regeneration equipment for the waste emulsion produced in the steel rolling process, comprising:

Feeding unit, the feeding unit is filled with various raw materials, the feeding unit includes waste emulsion raw material tank, demulsifier supply device and flocculant supply device;

a heating unit, the heating unit is connected to the feeding unit, the heating unit receives the raw material from the feeding unit, and heats the raw material;

Filter impurity removal unit, the filter impurity removal unit is connected to the heating unit, the filter impurity removal unit receives the heated waste emulsion from the heating unit, filters out the solid impurities in the waste emulsion, and sends out the filtered waste emulsion, filters The impurity removal unit includes a primary filter, a secondary filter and a magnetic filter connected in sequence;

The thermal-chemical treatment unit is connected to the feeding unit and the filter impurity removal unit, and performs thermal-chemical treatment on the heated and filtered waste emulsion. The thermal-chemical treatment unit includes a first mixer, a first A heat settling tank, a second mixer and a second heat settling tank, the first mixer is connected to the filter impurity removal unit, the demulsifier supply device and the first heat settling tank, the second mixer is connected to the flocculant supply device, the first heat settling tank and second settling tank; and

A product refining unit, the product refining unit is connected to the thermal-chemical treatment unit, and the product refining unit receives the emulsion after the thermal-chemical treatment, and performs further refining treatment on it.

Preferably, it also includes: a finished product receiving unit connected to the product refining unit, and the finished product receiving unit receives the produced qualified fuel oil.

Preferably, the demulsifier supply device includes a demulsifier tank and a demulsifier injection device, and the flocculant supply device includes a flocculant tank and a flocculant injection device.

Preferably, the filtering and removing impurities unit is connected to the heating unit through a flow meter.

Preferably, the product refining unit includes an intermediate product tank and an oil filter.

The present invention also provides a method for regenerating the waste emulsion produced in the steel rolling process, comprising the steps of:

a) Send the waste emulsion from the feeding unit to the heating unit;

b) Heat the waste emulsion to 60-95°C in the heating unit;

c) Send the heated waste emulsion from the heating unit to the filter and impurity removal unit, so that it passes through the primary filter, secondary filter and magnetic filter in order to remove solid impurities;

d) Let the filtered waste emulsion enter the first mixer, where it is statically mixed with the demulsifier from the demulsifier supply device, and the mixed liquid enters the first heat settling tank, and settles at a temperature of 60-95°C , the waste emulsion is stratified in the heat settling tank, the oil in the upper layer is sent to the intermediate product tank, the water in the lower layer is sent to the sewage treatment equipment, and the emulsified middle layer is sent to the second mixer;

e) Mix the emulsified middle layer with the flocculant from the flocculant supply device in the second mixer, and then let the mixed solution enter the second heat settling tank for further heat settling and dehydration, settle at a temperature of 60-95°C, and put The resulting upper layer of oil is sent to the intermediate product tank, and the lower layer of water is sent to the sewage treatment plant; and

f) Refining the oil in the intermediate product tank.

Preferably, it also includes: after step f), sending the refined oil to a product receiving unit.

Preferably, the heat settling temperature in the first heat settling tank and the second heat settling tank is 80-85°C.

Preferably, the demulsifier is compounded by anionic surfactant and nonionic surfactant.

Preferably, the demulsifier is compounded by sodium lauryl sulfate as an anionic surfactant and alkylphenol polyoxyethylene ether as a nonionic demulsifier.

Preferably, the mass ratio of sodium lauryl sulfate to alkylphenol polyoxyethylene ether is 200:1, and the addition amount is 6-10g/L emulsion.

Preferably, the flocculant is compounded by an organic flocculant and a silicone surfactant.

Preferably, the flocculant is composed of cationic polymethacrylic acid as organic flocculant and polyether polysiloxane copolymer as silicone surfactant.

Preferably, the mass ratio of cationic polymethacrylic acid to polyether polysiloxane copolymer is 20:1, and the addition amount is 200-300 mg/L emulsion.

With the help of the equipment and method of the present invention, the waste emulsion produced in the steel rolling process can be processed and treated efficiently and in line with environmental protection requirements, so that the recycled fuel oil with stable quality can be obtained with a high recovery rate, and the pollution of sewage can be significantly reduced. Dealing with difficulty.

Description of drawings

Fig. 1 is a schematic flow chart of waste emulsion (waste cold rolling oil) regeneration equipment and process according to a preferred embodiment of the present invention.

Detailed ways

Fig. 1 shows the regeneration equipment specially used in the waste emulsion (waste cold rolling oil) produced in the steel rolling process according to a preferred embodiment of the present invention, which mainly includes: a feeding unit, a heating unit, a filter and impurity removal unit, Thermo-chemical processing unit, product refining unit and finished product receiving unit.

As shown in Figure 1, the feeding unit is used to add various raw materials. The feeding unit includes, for example, a raw material tank 1, a demulsifier supply device (such as a demulsifier tank 6 and a demulsifier injection device 7), a flocculant supply device (such as a flocculant tank 11 and a flocculant injection device 12), respectively To add raw materials (waste emulsion), demulsifier and flocculant.

The heating unit is connected to the feeding unit for receiving raw materials from the feeding unit (especially the waste emulsion from the raw material tank 1 ) and heating the raw materials. The heating unit includes, for example, a heating tank 2 .

The filter impurity removal unit is preferably connected to the heating unit through a flow meter 3, and is used to receive the heated waste emulsion from the heating unit, filter out solid impurities in the waste emulsion, and send the filtered waste emulsion to the heating unit. - Chemical processing unit. The filtering impurity removal unit includes, for example, a filtering device 4 , more specifically, a primary filter 41 , a secondary filter 42 and a magnetic filter 43 connected in sequence. Among them, the primary filter 41 , secondary filter 42 and magnetic filter 43 that are connected in sequence to form a graded filter are unique configurations of the present invention. In the prior art, conventional filtration methods are often used to filter out solid impurities in the waste emulsion, which has the disadvantages of large filtration pressure drop and slow filtration speed. In the present invention, the filter impurity removal unit is arranged before the thermal-chemical treatment unit described later, rather than after the chemical treatment unit as in some prior art. Applicants have found that this significantly increases the effectiveness of the chemical agent. In addition, the filtering efficiency can be significantly improved by adopting the hierarchical filtering configuration of the present invention. Especially, the present invention is provided with magnetic filter 43 after primary filter 41 and secondary filter 42, and this magnetic filter is only widely used in food industry before, is used for removing metal impurities, and in other In the field of chemical processing, it is generally believed that its filtration efficiency is low, and no one uses it. However, the applicants of the present application have discovered that adding a magnetic filtration step after properly configured primary and secondary filtration can significantly increase filtration efficiency and effectiveness.

The thermal-chemical treatment unit is connected to the feeding unit and the filter impurity removal unit, and is used for thermal-chemical treatment of the heated and filtered waste emulsion. The thermo-chemical treatment unit includes, for example, a first mixer 5 , a first heat settling tank 8 , a second mixer 9 and a second heat settling tank 10 . The first mixer 5 is connected to the filter impurity removal unit, the demulsifier supply device and the first heat settling tank 8, the waste emulsion from the filter impurity removal unit and the demulsifier from the demulsifier supply device are static in the first mixer 5 ground mixing, and then sent to the first heat settling tank 8. The second mixer 9 is connected to the flocculant supply device, the first heat settling tank 8 and the second settling tank 10, the emulsion from the first heat settling tank 8 and the flocculant from the flocculant supply device are in the second mixer 9 statically mixed in the middle, and then sent to the second heat settling tank 10. What is different from the past is that in the present invention, the step-by-step treatment method of the demulsifier and the flocculant is used to carry out thermo-chemical treatment on the emulsified liquid. This step-by-step treatment, combined with the use of specialized demulsifiers and flocculants, significantly improves the efficiency and effectiveness of the treatment. This will be described in further detail in the description of the method below.

The product refining unit is connected to the thermal-chemical treatment unit, and is used for receiving the emulsion after thermal-chemical treatment and performing further refining treatment on it. The product refining unit includes, for example, an intermediate product tank 13 and an oil filter unit 14 . The oil filter 14 further performs vacuum dehydration on the oil from the intermediate product tank, so as to obtain qualified fuel oil.

The finished product receiving unit is connected to the product refining unit for receiving the produced qualified fuel oil. The finished product receiving unit comprises, for example, a product tank 15 .

The following will specifically describe how to use the equipment of the present invention to process the waste emulsion.

The present invention adopts the method of combining physical separation and chemical refining to process and treat the waste emulsion, and its general technological process is as follows:

Raw oil → heating unit → filter impurity removal unit → heat-chemical treatment unit → product refining unit → finished product receiving unit

First, the waste emulsion is pumped from the raw material tank 1 to the heating tank 2, where it is heated to 60-95°C (preferably 80-85°C).

Next, after being measured by the flow meter 3, the waste emulsion is pumped through the filter and impurity removal unit, so that it passes through the primary filter 41, the secondary filter 42 and the magnetic filter 43 in order to remove solid impurities. In the present invention, the filtration of solid impurities is carried out before the thermal-chemical treatment. Tests have shown that this significantly improves the effect of chemical demulsification. According to analysis, this may be due to the reduction of solid particles to the demulsification and dehydration of waste emulsion. effected. Specifically, it may be that the positive charges carried on the surface of solid impurity particles will consume part of the demulsifier and/or flocculant, thereby affecting the effect of thermal-chemical demulsification, so filtering out solid particles in advance can significantly improve the efficiency of thermal-chemical demulsification. Effect. In addition, the present invention adopts graded filtration. In this embodiment, the first-stage filter 41 is used to filter out large-particle solid impurities (60 mesh), and then the secondary filter 42 is used to filter out small-particle solid impurities (150 mesh). Finally, finer solid impurities are filtered out with a magnetic filter 43 . This configuration is based on the applicant's discovery, as described below, that the main component of the finer particle size solid impurities is iron, and that the use of a magnetic filter, which has never been used in the art, for the final stage of filtration can greatly improve the filtration efficiency. Moreover, through the filtration process of the magnetic filter, even if there are remaining solid impurities, they will be magnetized to avoid adsorption of oil molecules, thereby significantly enhancing the demulsification effect.

Next, the waste emulsion after filtering out impurities enters the first mixer 5, where it is statically mixed with the demulsifier from the demulsifier supply device. The mixed solution enters the first heat settling tank 8 and settles at 60-95°C (preferably 80-85°C) for 12-36 hours (preferably 24 hours). The spent emulsion is stratified in the heat settling tank to form upper, middle and lower layers. Wherein, the upper layer is oil with a water content of less than 5%, which is sent to the intermediate product tank 13 through the upper discharge pipe of the settling tank. The lower layer is mainly water-containing impurities (referred to as water impurities), with a pH value of 6-8, light yellow and transparent, and an oil content of less than 300mg/L, which can directly enter the sewage treatment equipment. There is an emulsified intermediate layer between the oil layer and the water layer, which is black and has a water content of 20% to 50% (generally 30 to 40%). Specifically, if the sewage is discharged out in dark brown, it indicates that the sewage has been discharged, and at this time it is the emulsified middle layer. The emulsified interlayer is statically mixed with the flocculant from the flocculant supply in the second mixer 9 . Then the mixed solution enters the second heat settling tank 10 for further heat settling and dehydration, and settles at a temperature of 60-95°C (preferably 80-85°C) for 12-36 hours (preferably 24 hours), and the resulting upper part contains less than 5% water The oil is sent to the intermediate product tank through the upper discharge pipe of the settling tank, while the discharge water from the lower part is dark brown and needs further flocculation treatment before being discharged into the sewage equipment.

Finally, the oil in the intermediate product tank 15 is subjected to further vacuum dehydration treatment with an oil filter machine, thereby filtering to obtain qualified fuel oil.

In the regeneration treatment equipment and process (method) of waste emulsion of the present invention, in addition to the above-mentioned different filtration and impurity removal and step-by-step treatment using demulsifiers and flocculants, the long-term research by the applicant is also specially selected. The heat-settling chemical demulsifier and flocculant especially suitable for the waste cold-rolling oil in the steel rolling process obtained afterward is also a very important aspect of the present invention.

The demulsifier according to the present invention is composed of anionic surfactants (such as sodium lauryl sulfate (K-12), sodium branched alkylbenzene sulfonate, sodium linear alkylbenzene sulfonate, alpha-olefin sulfonate etc.), nonionic surfactants (such as alkylphenol polyoxyethylene ether (TX-10)). In a preferred embodiment, sodium lauryl sulfate (K-12) as an anionic surfactant and alkylphenol polyoxyethylene ether (TX-10) as a nonionic demulsifier are selected to form a demulsifier. The mass ratio of the two is 200:1, and the addition amount is 6-10g/L emulsion. In the demulsifier of the present invention, the mass ratio of the cationic demulsifier to the nonionic demulsifier reaches 200:1, which breaks the more balanced ratio of the conventional demulsifiers.

Studies have shown that the waste emulsion in the field of waste cold-rolled oil used in the present invention is a water-in-oil type waste emulsion. The reason why this oil-water system can exist stably is that the surface of the water droplet and the surface of the solid impurity particle carry a large amount of positive charges, forming the electric double layer of the Stern model. Therefore, in the present invention, a large amount of compound demulsifiers containing anionic demulsifiers can be used to neutralize the positive charges on the surface of liquid droplets and solid particles, causing the water droplets to lose stability, thereby causing the water droplets and particles to coalesce and demulsify.

The flocculant according to the present invention is compounded by organic flocculant (such as polyacrylamide, cationic polymethacrylic acid (W6590)) and silicone surfactant (such as polyether polysiloxane copolymer (1603)) made. In a preferred embodiment, cationic polymethacrylic acid (W6590) and polyether polysiloxane copolymer (1603) are selected to form a flocculant, the mass ratio of the two is 20:1, and the addition amount is 200 -300mg/L emulsion.

Studies have shown that the waste emulsion used in the present invention has a high water content and contains a large amount of mechanical impurities, and the added polymer flocculant adsorbs and bridges with water droplets and solid particles through van der Waals force, electrostatic attraction, hydrogen bond or coordination bond . The polymer flocculant has a linear structure and has various active groups, which will adsorb the particles after colliding with them in the emulsion, and other groups of the polymer will also spread out in the solution to adsorb other particles and water droplets , In this way, the high molecular polymer will act as a bridge to make the flocs grow up, and the original stable waste emulsion loses its stability and realizes demulsification.

Furthermore, in the field of petrochemical industry, the demulsifier and flocculant are often used in combination, but in the present invention, the demulsifier and flocculant are used step by step. This seems to be an extra step, but in fact the demulsification effect is significantly improved, and the details can be described later. In addition, the dewatered water after using the demulsifier is clear, contains less oil, and the sewage treatment is convenient; on the contrary, the flocculation dehydration using the flocculant contains solid particle impurities, so the water color is turbid and the sewage has a high oil content. From this point of view, breaking the emulsion first and then flocculating can significantly reduce the difficulty of sewage treatment while achieving the purpose of production.

The process of regeneration treatment of waste emulsion according to the present invention will be described below in conjunction with an example.

1. Properties of raw materials (waste emulsion 2030):

1) Moisture content: 67.24%, the possible range is 30% to 70%

2) Solid impurity content: 2.71%, the possible range is 2% to 5%

3) Ash content: 2.63%, the possible range is 2% to 5%

The elements in the ash are mainly Fe and Ca, and the specific analysis is shown in the table below

Table 1: Element Content

Table 2: Effect of Temperature on Density and Viscosity of Waste Emulsion

Table 3: Properties of 2030 Waste Emulsion

2. Field Trial Program

1) The waste emulsion is directly poured into the heating tank from the tanker, and the waste emulsion is heated to about 95-98°C.

2) Configure water-soluble demulsifier (K-12 + TX-10), the concentration is 8-10%.

3) Bypass the waste emulsion with a temperature of 95-98°C (in order to further investigate the removal effect of thermal-chemical treatment on solid impurities, this industrial test excluded the filter impurity removal unit, so the waste emulsion was not filtered Miscellaneous unit) into the first heat settling tank, adding water-soluble demulsifier in an amount of 6-8g/L, the demulsifier is fully mixed with the waste emulsion through the feed pump and the first mixer, and the air bubbling is started after the feeding is completed. 10~15min.

4) Stand at a constant temperature of 80-85°C for 21 hours, drain about 3.5 barrels (630Kg) at the bottom, and the discharged wastewater is brown-black.

5) After releasing the clear water, pour the middle layer into the second heat settling tank, add flocculant (W6590+1603) 200-250mg/L, and let it stand at a constant temperature of 70-75°C for 24 hours.

6) After 24 hours, take an oil sample from the upper layer and import it into the intermediate product tank.

7) The fuel oil in the intermediate product tank is further processed by the oil filter machine to obtain the product fuel oil. Analyze the water content, mechanical impurities, ash and other indicators in the oil according to the indicators of fuel oil.

3. Analysis of test results

According to the above scheme, a total of 5 batches of industrial tests were carried out, and the results are shown in Table 4. In this test, a total of about 9 tons of 2030 waste emulsion were treated. After 5 days, a total of about 2.5 tons of fuel oil was obtained in the intermediate product tank; a total of 30.5 barrels and about 5.5 tons of waste water were discharged; 2 tons of intermediate layers are still being processed. The analysis data of fuel oil (1#) as an intermediate product, fuel oil (2#) once filtered through an oil filter machine (80 mesh filter), and fuel oil (3#) that has been filtered and vacuum dehydrated are shown in the table 5.

According to the industrial test process, in the demulsification stage, the demulsification dose added between 6% and 8% has no obvious influence on the demulsification effect and demulsification speed, so the demulsification dosage is preferably controlled at 7g/L. Since only the cone of the settling tank is heated, the rest is not heated and only kept warm, so the raw material waste emulsion should be heated to about 95-98°C in the heating tank, otherwise the temperature of demulsification and flocculation cannot be guaranteed in the future. From the demulsification and flocculation sedimentation experiments carried out in the laboratory oven at the same time, it can be seen that in fact, as long as the overall temperature of the waste emulsion is kept at about 75°C, the requirements of demulsification and flocculation sedimentation can be met. It can also be seen from the dehydration rate that when the processing capacity is relatively small, when the waste emulsion is only added to the cone part, under similar temperature conditions, the dehydration rate is also high due to better heat preservation; but if the processing capacity is large, even if The temperature entering the settling tank is relatively high, but due to the limited heat preservation, the actual treatment temperature is relatively low, especially the temperature of the cylinder part is relatively low, so the dehydration rate is affected. Because there is no drainage operation at night, the demulsification time is relatively long. From the laboratory oven experiment, it can be seen that only 8-10 hours is enough for demulsification. The field industrial test on a certain day also showed that after adding the demulsifier for 3.5 hours, the water output was about 600Kg, which shows that the water output speed is still very fast. After adding the flocculant, the settling temperature is generally 70-75°C, and the settling time is relatively long, usually above 24 hours. According to the laboratory results, if the settling temperature can be raised to 80°C, the settling time can be shortened to 12-16 hours.

This industrial test produced a total of about 2.7 tons of fuel oil, and the raw material 2030 waste emulsion contained about 9×(1-0.61-0.06)=3 tons of oil, so Compared with the situation known in the art, the recovery rate is significantly improved, and the effect is very ideal.

Table 4: Industrial test results of waste emulsion

Note 1: 1 barrel of waste water is about 180Kg.

Note 2: 3.5hr out of water is about Barrel, about 600Kg

Note 3:

Table 5: Fuel oil properties for intermediate product tanks

Table 6: Final Product Fuel Oil Properties

It can be seen from Table 6 that the properties of the final product fuel oil are good, and its indicators are good, which can be applied to various occasions that need to obtain combustion energy (such as for boiler combustion).

Although the present invention has been described in detail above in conjunction with a preferred embodiment, it should be understood that those skilled in the art can make various equivalent modifications and changes based on the above content. For example, the aforementioned finished product receiving unit can be omitted, and the final product can be directly obtained from the product refining unit; the composition of the feeding unit can be varied, and is not limited to the form of tank containers and pumps, etc. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (8)

1. A kind of regeneration equipment for the waste emulsion that produces in the steel rolling process, it is characterized in that, comprises: A feeding unit, the feeding unit is filled with various raw materials, and the feeding unit includes a waste emulsion raw material tank, a demulsifier supply device and a flocculant supply device; A heating unit, the heating unit is connected to the feeding unit, the heating unit receives the raw material from the feeding unit, and heats the raw material; A filter impurity removal unit, the filter impurity removal unit is connected to the heating unit, the filter impurity removal unit receives the heated waste emulsion from the heating unit, filters out the solid impurities in the waste emulsion, and sends out the filtered The waste emulsion, the filter impurity removal unit includes a primary filter, a secondary filter and a magnetic filter connected in sequence; A thermal-chemical treatment unit, the thermal-chemical treatment unit is connected to the feeding unit and the filter impurity removal unit, and performs thermal-chemical treatment on the heated and filtered waste emulsion, and the thermal-chemical treatment unit Including a first mixer, a first heat settling tank, a second mixer and a second heat settling tank, the first mixer is connected to the filter impurity removal unit, the demulsifier supply device and the first heat settling tank a settling tank, the second mixer is connected to the flocculant supply device, the first heat settling tank and the second settling tank; and A product refining unit, the product refining unit is connected to the thermal-chemical treatment unit, and the product refining unit receives the emulsion after thermal-chemical treatment and performs further refining treatment on it. the 2. The regeneration equipment for the waste emulsion produced in the steel rolling process as claimed in claim 1, further comprising: a finished product receiving unit connected to the product refining unit, and the finished product receiving unit receives and prepares qualified fuel oil. the 3. The regeneration equipment for the waste emulsion produced in the steel rolling process as claimed in claim 1, characterized in that, the filtering impurity removal unit is connected to the heating unit through a flow meter. the 4. The regeneration equipment for the waste emulsion produced in the steel rolling process as claimed in claim 1, characterized in that, the product refining unit comprises an intermediate product tank and an oil filter. the 5. a regeneration method for the waste emulsion produced in the steel rolling process, is characterized in that, comprises the steps: a) Send the waste emulsion from the feeding unit to the heating unit; b) heating the waste emulsion to 60-95°C in the heating unit; c) The heated waste emulsion is sent from the heating unit to the filter and impurity removal unit, so that it passes through a primary filter, a secondary filter and a magnetic filter in order to remove solid impurities; d) The filtered waste emulsion enters the first mixer, where it is statically mixed with the demulsifier from the demulsifier supply device, and the mixed solution enters the first heat settling tank, and settles at a temperature of 60 to 95 ° C, The waste emulsion is stratified in the heat settling tank, the oil in the upper layer is sent to the intermediate product tank, the miscellaneous water in the lower layer is sent to the sewage treatment equipment, and the emulsified middle layer is sent to the second mixer, wherein the The demulsifier is compounded by sodium lauryl sulfate as an anionic surfactant and alkylphenol polyoxyethylene ether as a nonionic demulsifier; e) Mix the emulsified middle layer with the flocculant from the flocculant supply device in the second mixer, then let the mixed solution enter the second heat settling tank for further heat settling and dehydration, and settle at a temperature of 60-95°C , the generated upper layer of oil is sent to the intermediate product tank, and the lower layer of water is sent to the sewage treatment equipment. The flocculant is composed of cationic polymethacrylic acid as an organic flocculant and organic silicon surfactant Compounded with polyether polysiloxane copolymer; and f) Refining the oil in the intermediate product tank. the 6. the regeneration method for the waste emulsion produced in the steel rolling process as claimed in claim 5, is characterized in that, the heat settling temperature in described first heat settling tank and described second heat settling tank is 80 ~85°C. the 7. the regeneration method for the waste emulsion that produces in the steel rolling process as claimed in claim 5, is characterized in that, the mass ratio of described sodium lauryl sulfate and described alkylphenol polyoxyethylene ether is 200 : 1, the amount added is 6-10g/L emulsion. the 8. the regeneration method for the waste emulsion produced in the steel rolling process as claimed in claim 5, is characterized in that, the mass ratio of described cationic polymethacrylic acid and described polyether polysiloxane copolymer The ratio is 20:1, and the dosage is 200-300mg/L emulsion. the