RU1772145C - Plant for turbine oil regeneration - Google Patents

Abstract

SUMMARY OF THE INVENTION: A turbine oil recovery unit includes an alkaline refining tank for regenerated oil, equipped with a heater and a vapor removal device, and installed in front of the pump. The pump is connected to a pre-filter, which is connected in series with zeolite and silica gel adsorbers and fine filters. 1 ill., 1 tab.

Description

The invention relates to the field of purification of used oils to produce useful products, in particular to turbine oil recovery plants based on tertiary esters of phosphoric acid (trixylene phenophosphates).

The invention solves the problem of purification and regeneration of flame retardant turbine oils, trixylene phenophosphates, under conditions of a power plant.

A percolation treatment unit is known, comprising percolation filters loaded with bleaching clay and equipment for the regeneration of spent bleaching clay (silos, oven, refrigerator, elevator).

Due to the increased content of water and sludge, the sorbent is rapidly saturated and its sorption properties are completely lost. In addition, the use of several types of sorbents is not contemplated for this installation, which also negatively affects the operation efficiency of the installation.

According to the achieved result, the closest to the described one is a transformer and turbine oil regeneration unit comprising a coarse filter, a pump, a zeolite and silica gel adsorber heater, and a fine filter in series.

The disadvantage of this installation is that due to the significant (1-5% by weight) humidification, high acid number of a large amount of sludge in the original flame-retardant oil, it is impossible to process such fire-resistant oils and restore their properties for future use.

An object of the invention is to increase the degree of purification of highly contaminated oils.

sl c

vj

Xi

b

Ј cl

The goal is accessed by the fact that the turbine oil regeneration unit, comprising a pump, a pre-filter and serially connected zeolite and silica gel adsorbers and fine filters, according to the invention further includes a tank for alkaline cleaning of the regenerated oil, equipped with a heater and a device for removing vapors and installed in front of the pump connected to the pre-filter. The arrangement of the individual apparatuses and their interconnection are determined by the sequence of operations for cleaning and regenerating the oil: neutralizing acidic compounds, separating water and spent alkali solution; oil drying; pre-filtering; deep drying by zeolites; absorption of bituminous substances by silica gel; filtration on fine filters. The installation diagram is shown in the drawing.

The dirty oil tank 1 serves to collect the oil, mix the oil with an alkali solution, heat the oil and alkali, separate the spent alkali and water solution from the oil, and dry the oil. To perform these functions, the oil tank is equipped with a heating coil, has a drainage comb (several drains located at different heights in the upper part of the tank) to remove water and treated alkali solution, and a drain line from the bottom of the tank to remove settled sludge. B is connected by a pipe in the lower part of the tank to the pump, the top cover of the tank is connected by a pipe to a vapor removal device, which can be used as an exhauster. In addition, the tank has a line for receiving dirty oil, a line from the spout and spout tank, and a line for recirculating oil from the pump head. The alkali dosing tank 2 is for introducing a certain amount of alkali solution into the dirty oil tank,

Pump 3 provides mixing of the oil and the liquor solution in the dirty oil tank along the recirculation line from the pump head to the dirty tank, as well as the oil rolling through the filters and adsorbers along the line from the pump head to the preliminary (primary) filter. A gear oil pump is used in the circuit, therefore a bypass line is provided to control its flow.

Primary filters 4 are designed to remove the bulk of the sludge and solids with a particle size of 25-30 microns or more. Most suitable

the material for charging the filter element of the pre-filter is a filter belting fabric (according to GOST 332-69) having a filter fineness of 2025 microns.

The drying unit in the form of zeolite adsorbers 5 is designed for deep drying of oil. The adsorber binding circuit allows for parallel or sequential pumping of oil. Zeolite adsorbers are charged with pre-dried zeolites such as CaA, CaX or NaA, NaX.

The regeneration unit in the form of silica gel adsorbers 6 is designed to absorb asphalt-resinous substances and other oxidation products from oil. The silica gel adsorbers strapping scheme also allows for parallel or sequential pumping of oil.

Fine filters 7 are designed to remove particulate matter and sludge with a particle size of 5-10 microns or more. Filters are activated alternately or

5 at the same time.

Installation works as follows.

A batch of dirty oil in an amount of 3.5 tons (with indicators: water content: - 2%;

0 acid value - 0.8 mgKOH per g of oil; the content of solids - 0.5% of the mass; the content of water-soluble acids - 0.04 mg KOH) is fed into tank 1, then 50 l of an aqueous solution of NaOH (concentration of 4%) from tank 2 is fed into it, pump 3 is turned on to mix alkali and oil in tank 1. After pump 3 is turned on for recirculation of oil in tank 1, hot condensate is fed into tank 1 into a heating coil and include

0 exhauster. After two hours of recirculation, the pump is stopped, the heating coil is turned off, and within 3 hours the oil is separated from the aqueous alkali solution, which is collected in the oil layer.

5 Then, the separated alkali solution is poured into the drain tank, (15-20 L) of sludge deposited in the drain funnel of tank 1 is drained there. After draining the aqueous alkali solution, turn on pump 3 for recirculation

Tank 0 delivers hot condensate to the heating coil. The oil is dried for 10-12 hours, the oil temperature is maintained in the range of 75-85 ° C. After 8 hours of drying, the moisture content in the drained oil is monitored every 2 hours. Then the oil is pumped through pump 4 through filters 4, zeolite adsorbers 5, silica gel adsorbers b and fine filters 7. The results of the oil refining are presented in the table.

Thus, the installation in comparison with the prototype allows the purification and regeneration of flame-retardant turbine oils - trixylene phenates, acidity, moisture content, solids and sludge, which can reach significant values.

Claims (1)

SUMMARY OF THE INVENTION Turbine oil regeneration apparatus including pump, pre-filter Ritual. purification and sequentially connected zeolmt and silmkagel adsorbers and fine filters, so that. in order to increase the degree of purification of the oils, the installation further includes a tank for alkaline cleaning of the regenerated oil, equipped with a heater and a device for removing vapors and installed in front of the pump connected to the pre-filter. I - tf  J tf efoepaww / i / fax