Demulsification of fuel and chemical thin oil sealed dry gas storage tank sealing oil Zhao Yufei 6 Anshan City Gas Corporation 7 thin oil sealed dry gas storage tank sealing oil will appear emulsified in the recycling through the emulsification mechanism and Analysis of the raw materials proposed a demulsification method and a choice of demulsifier.

Dry gas tank sealing oil demulsifier problems The company's existing coke oven gas storage tanks have a total gas storage capacity of 10,000. The seat is a thin oil-sealed dry gas storage tank, which accounts for the total gas storage capacity as the most important city gas. Gas storage facilities Dry tank piston seals and seal oil quality are important for the sealing operation of the tank. The dry gas storage tank of the Lishan gas supply station begins to appear emulsified after one year of replacement of the sealing oil. The appearance of the milky liquid seal oil from brownish transparent liquid to brown and turbid is shown in the table. Since the sealing oil generates acidic substances due to oxidation during use, the acid value of the oil is the main judgment index of the degree of deterioration of the oil. The sealing oil of the gas storage tank of the Tateyama gas supply station indicates that the acid values ​​of the emulsified oil and the non-emulsified oil are large. The increase in amplitude seriously affects the quality of the sealing oil. From the water content of the emulsified oil, it can be concluded that water is the main reason for the emulsification of the oil and promotes the oxidation rate of the oil and the corrosion of the metal by the low molecular organic acid. Accelerate the antioxidant, anticorrosive agent and metal deactivation in the oil. Decomposition and sedimentation of additives such as agents gradually lose their effect. After the emulsification of the sealing oil, the viscosity is suddenly increased, and the fluidity is deteriorated, which is particularly unfavorable for the normal operation of the gas storage tank in winter. Although the standard for refrigerating machine oils is not fully applicable to sealing oils, it can still be used to judge the deterioration trend of sealing oils.

The emulsification is caused by the incompatibility of the seal oil and water. The emulsified oil is completely water-in-oil. The production process of the Lishan gas supply station shows that the dry gas storage tank is closer to the emulsification of the seal oil than the gas wet desulfurization section. The reason for the more serious analysis is as follows: 627 The saturated wet gas 9 produced by the wet desulfurization of the gas further promotes the emulsification of the sealing oil.

Although the 607 gas is desulfurized, the sulfur contained in the gas still enters the sealing oil, which increases the acid value of the sealing oil and accelerates the oxidation rate of the sealing oil and the rate of formation of the deposit.

When 6Q7 uses oil pump to supply oil to the top of the gas storage tank, the fuel of the 9 pump impeller and the chemical agitation accelerate the emulsification speed of the sealing oil.

A trace amount of tar 6 in the gas can increase the deposit formed by the seal oil.

Demulsification test We have carried out the demulsification test on the emulsified sealing oil. First, the emulsified oil is heated to form a stable emulsion. Then, after adding excess sodium carbonate to the emulsified oil, the color of the emulsion is deepened and heated. The phase separated oil phase is immediately produced as a brown transparent liquid.

The test results analyzed the effect of 738 electrolytes. When sodium carbonate is added as an electrolyte to the emulsified oil, the ionic heterogeneous charge and the liquid droplet charge neutralization in the emulsified oil reduce the repulsive force between the beads, so that the liquid beads aggregate into large liquid beads under the action of gravity and separate from the oil phase. Its phenomenon is similar to the coacervation of colloids.

78 warming effect. The temperature rise can be used as an auxiliary means. 6 The temperature rise can increase the chance of collision between the liquid beads and reduce the adsorption of the emulsifier, thereby accelerating the progress of the phase separation process.

The role of 78 base. Alkali reacts with acidic substances in the oil 6 to form a surfactant. The synergistic effect of various surfactants can cause the interfacial tension to decrease by an order of magnitude. Since the alkali has the ability to greatly reduce the surface tension of the emulsified oil, the micelles in the oil can be desorbed to increase the free chain of the single molecule and migrate to the oil-water interface to greatly reduce the interfacial tension. We observed the emulsified oil sample of the gas storage tank of Lishan gas supply station under the microscope and found that the spherical micelles with diameter existed. When the sodium carbonate was added and heated, the oil phase became brown transparent liquid. The above particles could not be found when observed under the microscope. The acid value of the oil product also decreased. It can be seen from the table that the emulsified oil has a relatively large decrease in the acid value due to the better separation effect of the phase.

Demulsifier selection Because the demulsification process is a relatively complicated process, we have not yet found a general rule. Our operation for dry gas storage tanks actually considers the following aspects of emulsification reasons in selecting the demulsifier. The reason why the emulsion is extremely stable is that it is necessary to eliminate or reduce the protective ability of the emulsified material due to the action of the emulsified material. Therefore, it is necessary to have a deeper understanding of the performance of the emulsified substance before the demulsification is carried out.

78 demulsification dominates both the oxidation and corrosion problems. Since the cause of deterioration of oil is various, in the selection of demulsifier, in addition to the main consideration of its demulsification ability, its anti-oxidation and corrosion-reducing problems should also be considered. Since the working environment of the sealing oil is inseparable from water, oxygen and sulfur, the highly alkaline demulsifier should be preferred to prevent oxidation and reduce corrosion while breaking the emulsion.

78 demulsification costs. In the petroleum industry, although there are special additives such as demulsifiers and detergents, they are expensive. We use sodium carbonate as a demulsifier, which is not only cheap but also ideal for demulsification, and can be widely used in industrial production.

Demulsification operation 738 set up a special oil settling tank. The higher the tank, the longer the time it takes for the mechanical impurities to settle to the bottom of the tank. Generally, the settling tank can be made into an oblate circular trough with a large diameter and a small height. At the same time, in order to accelerate the sedimentation speed of the fine iron particles, a permanent magnet or an electromagnet may be added to the tank.

78 added flocculant and demulsifier. The emulsified oil can be regarded as a colloid. The solid particles are also in the colloidal state. After adding the flocculant and the demulsifier, the charge on the surface of the colloidal particles can be neutralized to eliminate the electrostatic repulsion between the colloidal particles. As a flocculant and demulsifier.

78 Heat and stir. Heating can reduce the viscosity and density of the sealing oil to facilitate the speed of sedimentation. However, when the heating temperature is higher, not only the oil is easily oxidized, but also the color is obviously deeper. The quality is deteriorated and the boiling of water in the oil is not conducive to sedimentation. The upper limit is defined by the simultaneous use of agitation to promote flocculation.

78 Resting, Settlement 6 Excluding sediments and water 6 The purification process with demulsification and dehydration as the main purpose at the end of this step is over. The viscosity and low temperature properties of the seal oil used for a long time are changed. Add the appropriate additives.

758 If the site conditions are not allowed, 6 can be treated with the tank bottom oil tank of the gas tank and the heating facility, and the oil in the oil can be separated by oil water separation. However, this method cannot remove the deposit in the oil.

Conclusion With the gradual withdrawal of wet gas storage tanks, the thin oil-sealed dry fuel and chemical gas storage tanks have become the mainstream equipment. The problem of emulsification and demulsification of seal oil has gradually become more and more important. The gas storage tank needs to use the sealing oil for about 10,000 yuan per year. The emulsified sealing oil demulsification technology can not only extend the service life of the sealing oil but also obtain considerable economic benefits.

Xie Xingyan edited the chemical treatment of circulating water in the coking plant 奚 Bai Anshan Iron and Steel Institute = Liu Jingyan Angang Steel Chemical Plant = Through the screening of organic corrosion and scale inhibitors, the problem of scaling and corrosion of coking circulating water system by chemical method was studied. The production practice of the chemical plant shows that it not only achieves significant effects in scale inhibition and also saves water consumption.

Coking plant circulating cooling water chemical treatment of scale inhibition Corrosion coking plant cooling water closed circuit is one of the main measures to save water resources Compared with DC cooling water system, circulating water system is more likely to cause scaling and corrosion of heat exchange equipment. Anshan Iron and Steel Chemical Plant will reduce the gas collection temperature not only affecting the heat exchange efficiency of the equipment but also the yield of chemical products, except for the acid pre-cooling of the gas primary cooler and the need to use steam to purge and replace the new water. Reduced equipment life and increased maintenance costs.

Water quality analysis The gas primary cooling system of the three recycling workshops of Anshan Iron and Steel Chemical Plant adopts three-string two-stage two-stage cooling method. The first section of the cooling water cycle uses the second section of cooling water for groundwater use as a supplemental water meter for the first section to list the water quality analysis.

The actual measurement shows that the average temperature of the circulating water inlet is the average temperature of the outlet. The maximum temperature of the pipe wall is: 1P. The calculation results of the saturation index and the stability index of the circulating water under different operating conditions are shown in the table. The hardness and alkalinity are both high and the content of calcium and magnesium ions is also high. Since calcium and magnesium salts are sparingly soluble or poorly soluble salts in water, these salts are often dissolved in water as acid salts. The acid salt is converted into a positive or basic salt having a small solubility due to desorption and an increase in value during cooling. These salts have an abnormal solubility property, that is, when the temperature is increased, the solubility is rather lowered, and it is easy to deposit scale in the heat exchanger.

As the concentration of concentrated water in the circulation increases, the number of ions in the water also increases. Both the saturation index and the stability index show a tendency to increase the scale strength. It can be seen that this circulating water is a scale type water. From the analysis of chloride ion and sulfate ion content, water is also more corrosive.

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