CN1253255A

CN1253255A - Cutting and back-mixing technology for mixed oil

Info

Publication number: CN1253255A
Application number: CN 98114441
Authority: CN
Inventors: 商鹏
Original assignee: Fushun Storage And Transportation Technology Development Co
Current assignee: Fushun Storage And Transportation Technology Development Co
Priority date: 1998-11-07
Filing date: 1998-11-07
Publication date: 2000-05-17

Abstract

A cutting and back-mixing technology for generating mixed oil in sequential long-distance delivery pipeline of finished oil is aimed at eliminating economic loss of mixed oil. On the basis of the quality data of delivered oil and the technological parameters of pipeline, the concentration change curve for oil-mixing segment is calculated and drawn. Based on the quality potential of said oil, the oil is divided into oil-mixing head segment, cutting segment and tail segment. By means of the interface characteristic that the mixed oil concentration is symmetrical by 50%-50% in cutting segment, the cutting segment is divided into two parts by length and the mixed oil are respectively stored in two oil tanks for respective back-mixing. The back-mixing quantity is increased by 5-10 times.

Description

The cutting of contaminated product reaches back the treatment process technology of mixing

The present invention relates to a kind of length apart from oil product conveyance conduit sequential delivery technology, particularly relate to length and reach back the treatment process technology of mixing apart from Products Batch Transportation Pipeline produces contaminated product in order oil transportation process cutting.

Contaminated product is long inevitable outcome apart from processed oil pipeline sequential delivery manufacturing process.After the mutual blending of oil product sequential delivery of two kinds of different in kinds, this contaminated product has just lost direct use value.Processing mode to above-mentioned contaminated product has two kinds at present: a kind of is the sale that lowers category, i.e. price reduction is handled, and contaminated product is used as substandard products is sold to the user.Another kind is that contaminated product is transported back oil refinery, and processing is divided into single variety again to contaminated product again, recovers its use value.Contaminated product transportation loss can take place in this processing mode, increases cost of transportation, can produce the contaminated product refining losses again, increases contaminated product processing cost etc.In a word, existing contaminated product processing mode can cause the above economic loss of the millions of units of oil transport pipeline every year.

The purpose of this invention is to provide a kind of new contaminated product cutting that can eliminate the contaminated product economic loss and reach back the treatment process technology of mixing.

The object of the present invention is achieved like this: calculating and make with 50%-50% concentration interface according to the correlated quality data (oil density, viscosity etc.) of institute's oil transportation product and the concrete process parameter of pipeline (duct length, diameter, flow velocity etc.) is 0 mixture spread figure, again according to correlated quality potentiality situation after the oil product blending, contaminated product is divided into: the contaminated product rear that can go into jar with contaminated product head section, the contaminated product cut length that need cut out, the oil product of can going subsequently that forward oil product is gone into jar, according to the mixed contamination plug length of need cutting, the design contaminated product cuts pipeline again.Utilize mixing concentration in the mixed contamination plug scope that needs cut out, to be symmetrical in the characteristic of 50%-50% batching interface, the mixed contamination plug that cuts is divided into two by length again, two sections contaminated products are stored in respectively in two slop tanks, return respectively and mix.Return when mixing implementing contaminated product, choose the approaching contaminated product of concentration and oil product through pipelines and return and mix.Contaminated product is extracted out from slop tank, all returned in the ratio of determining equably continuously and mix in the defeated product oil of pipe.

Adopt this process engineering cutting contaminated product not only can make full use of the qualitative potential of the defeated product oil of pipe, with the oil transportation process with concentration the long contaminated product head of very low but mixed contamination plug, the contaminated product afterbody directly mix convert in move ahead and back row product oil in, thereby significantly reduce contaminated product generating capacity (amount of cutting out).The more important thing is and take and to cut out the mixed contamination plug separate storage that is divided into two, after returning the new process of mixing respectively, return that the ratio of mixing is comparable brings up to 0.5-1% by 0.1% when not separated, contaminated product returns the comparable former contaminated product of volume and improves 5-10 doubly, mix thereby obtained whole the returning that to realize contaminated product, do not cause remarkable results such as economic loss.This technology be an investment seldom, but the contaminated product New Process for Treatment technology of obvious economic.

The drawing explanation:

Fig. 1 mixes processing technological flow figure for the contaminated product cutting reaches back.

Fig. 2 is for 50%-50% concentration interface being 0 mixture spread (gasoline moves ahead) figure.

Fig. 3 is for 50%-50% concentration interface being 0 mixture spread (diesel oil moves ahead) figure.

Among Fig. 1:

90# gasoline tank 1 0# diesel oil tank 2

Contaminated product pipeline 3 slop tanks 4

5 slop tanks 6 are cut down in adjusting

93# gasoline tank 7 5# diesel oil tanks 8

Advance 5# diesel oil tank 8 quick electric ball valve 9-1

Advance 93# gasoline tank 7 quick electric ball valve 9-2

Advance 90# gasoline tank 1 quick electric ball valve 9-3

Advance 0# diesel oil tank 2 quick electric ball valve 9-4

Advance slop tank 4 quick electric ball valve 9-5

Contaminated product returns mixes pump 10 densitometers 11

Come oily long-distance transport pipes 12 flowmeters 13

Contaminated product returns to mix and cuts down the outlet of 14 slop tanks 4 and cut down 15

6 jars of advance-cuttings 17 of valve 16 slop tanks before 4 jars of the slop tanks

Slop tank 6 outlets cut down 18

Embodiment: the invention will be further described below in conjunction with embodiment:

On the south defeated processed oil pipeline sequential delivery gasoline and diesel oil be practiced as example:

The initial station is located at Fushun, the station is not located at Yingkou Spanish mackerel circle.246 kilometers of pipeline total lengths, 350 millimeters of bores, Fig. 1 quick electric ball are cut down 9-5 to 300 meters of

slop tank

4,6 contaminated product pipelines of slop tank, 3 length, 350 millimeters of bores, and the station is not established contaminated product and is returned and mix 10 two of pumps (standby).Piping design year 2400000 tons/year of throughput rates, day throughput rate 6000 ton per days.

Sequential delivery gasoline, diesel oil have:

Fig. 1: storage tank 1 (90# gasoline), gasoline endpoint 190-195 ℃ have 10-15 ° of qualitative potential; Storage tank 2 (0# diesel oil), diesel oil flash-point have 10-15 ℃ of qualitative potential for 75-80 ℃; Storage tank 7 (93# gasoline); Storage tank 8 (5# diesel oil).

According to above-mentioned oil quality data and pipeline technology parameter, calculate and make Fig. 2: mixture spread (gasoline moves ahead) figure that with 50%-50% concentration interface is at 0; Fig. 3: the mixture spread figure (diesel oil moves ahead) that with 50%-50% concentration interface is at 0.

Through test, the cutting concentration of contaminated product head and contaminated product tail is defined as 10%-90% respectively.Promptly the mixed contamination plug concentration range of actual cutting is 10%-90%.And the contaminated product head of 0%-10% concentration range directly enters the forward oil product basin with forward oil product, and the contaminated product of 90%-100% concentration range is trailed trailing oil product and directly entered the trailing oil product storage tank.From Fig. 2, Fig. 3 as seen: the mixed contamination plug of 10%-90% concentration range is symmetrical in 50%-50% concentration interface fully, mixed contamination plug length is 600 meters, 0 preceding forward oil product is main (concentration 75%), trailing oil product is that main (concentration 75%) respectively accounts for 300 meters after 0, and the contaminated product quick electric ball of not standing cuts down 9-5 and also is 300 meters just to contaminated product pipeline 3 length of 6 of slop tanks 4, slop tank.Like this, mixed contamination plug can be divided into two, be stored in two slop tanks respectively, return respectively and mix.

Contaminated product cutting operation (90# gasoline moves ahead, 0# diesel oil after row):

90# gasoline density value is 0.7280, and 0# diesel oil density value is 0.8320, and the variable density scope of the contaminated product head correspondence of 0%-10% concentration range is 0.7280-0.7380 as calculated; The corresponding variable density scope of the contaminated product tail of 90%-100% concentration range is 0.8170-0.8320.Assign contaminated product cutting instruction by the total activation chamber.To go into slop tank 4 (gasoline is a main) jar advance-cutting 16 by the tank field post operation personnel that do not stand and open (gasoline concentration 75%).When the densitometer 11 of not standing shows that the gasoline density value slowly rises to 0.7380 by normal 0.728, the operator that do not stand close into immediately, and 90# gasoline tank 1 quick electric ball cuts down 9-3, open contaminated product simultaneously and advance slop tank 4 quick electric balls and cut down 9-5, above-mentioned handover operation is all finished in 10 seconds.The bit manipulation personnel that do not stand guard will continue to pay close attention to densitometer 11 display density situations of change, after 12 minutes, rise to 0.8170 specified value when contaminated product density, closing into immediately by operator, slop tank 4 quick electric balls cut down 9-5, open simultaneously into that the quick electric ball of 0# diesel oil tank 2 cuts down 9-4, this operation is also finished in 10 seconds.

When contaminated product cutting next time, forward oil product changes 0# diesel oil into.Close 4 jars of advance-cuttings 16 of slop tank earlier, open slop tank 6 (diesel oil concentration 75%) jar advance-cutting 17.When reaching contaminated product head regulation cut capacity and be worth 0.8170, close into that 0# diesel oil tank 2 quick electric balls cut down 9-4, opening into simultaneously, slop tank 4 quick electric balls cut down 9-5.After 12 minutes when reaching contaminated product tail regulation cut capacity and be worth 0.7380, the cutting contaminated product begins into slop tank 6, closes into that slop tank 4 quick electric balls cut down 9-5, and opening into simultaneously, 90# gasoline tank 1 quick electric ball cuts down 9-3, so far, finish a mixed contamination plug cutting operation again.

As above-mentioned gasoline and the diesel oil contaminated product cutting operation of carrying out repeatedly, all mixed contamination plug is severed respectively with the 50%-50% batching interface at every turn, the first half advances slop tank, half then stays the back in the contaminated product pipeline and advances another slop tank with preceding half section that cuts contaminated product next time, and just mixed contamination plug being divided into gasoline is that main (slop tank 4) and diesel oil have been the contaminated product of main (slop tank 6) separate storage.

Contaminated product returns mixes operation:

By product oil qualitative potential and the terminal slop tank quality situation of total activation heave root, calculate back the ratio of blending oil, and assign instruction and dispatch to terminal according to input pipeline.When line transportation gasoline, return blending oil tank 4 contaminated products (gasoline is main, concentration 75%), when line transportation diesel oil, return blending oil tank 6 contaminated products (diesel oil is main, concentration 75%),

As manage defeated gasoline, return blending oil ratio example and be decided to be 1%.After terminal scheduling connect the total activation instruction, notice post operation personnel cut down 15 with slop tank 4 outlets and open, and contaminated product returns to mix and cuts down 14 and open, and started a contaminated product and returned and mix pump 10.The levelling contaminated product returns to mix to regulate and cuts down 5, and what make that flowmeter 13 shows returns volume by 1% proportional control.

Return the ratio 1% of mixing, always the blending oil mass surpasses 1200 tons admittedly, presses contaminated product price reduction loss 600 yuan of calculating per ton, can reduce more than 70 ten thousand yuan of contaminated product losses.Do not implement mixed contamination plug cut apart store novel technique before, because two slop tanks receive contaminated product simultaneously, mixing concentration gasoline, diesel oil respectively account for 50% in the slop tank, be stranded this, returning the ratio of mixing in gasoline and the diesel oil is below 0.1%, after the cutting of implementing contaminated product reaches back and mixes the treatment process technology, return the mixing concentration of mixing and improved more than 25%, return the ratio of mixing and bring up to 0.5-1% than former contaminated product (50% concentration).Therefore, the comparable former contaminated product of volume (or ratio) that returns of contaminated product improves 5-10 doubly.

Claims

A kind of cutting of contaminated product reaches back the treatment process technology of mixing, it is characterized in that: calculating and make with 50%-50% concentration interface according to the correlated quality data (oil density, viscosity etc.) of institute's oil transportation product and the concrete process parameter of pipeline (duct length, diameter flow velocity etc.) is 0 mixture spread figure, again according to correlated quality potentiality situation after the oil product blending, contaminated product is divided into: can go into the contaminated product head section of jar with forward oil product, the contaminated product cut length that need cut out, the oil product of can going are subsequently gone into the contaminated product rear of jar.Again as required

The mixed contamination plug length of cutting, the design contaminated product cuts pipeline, utilizes the characteristic of mixing concentration symmetrical 50%-50% batching interface in the mixed contamination plug scope that needs cut out, and the mixed contamination plug that cuts is divided into two by length again, two sections contaminated products are stored in respectively in two slop tanks, return respectively and mix.Return when mixing implementing contaminated product, choose the approaching contaminated product of concentration and oil product through pipelines and return and mix, contaminated product is extracted out from slop tank, all return to mix in the ratio of determining equably continuously and fail in the product oil to managing.