CN1240817A

CN1240817A - Process for preparing civil gas by absorbing 5C light hydrocarbon using air

Info

Publication number: CN1240817A
Application number: CN 98102767
Authority: CN
Inventors: 简昌利; 陆建树
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-07-03
Filing date: 1998-07-03
Publication date: 2000-01-12
Anticipated expiration: 2018-07-03
Also published as: CN1069916C

Abstract

A process for preparing civil gas by using air to absorb C5 light hydrocarbon that may be the cheap residual liquid of liquefied petroleum gas uses special stripper as main equipment. The feedstock is fed to the top of tower and through bubble cap trays then overflow to tower bottom with a certain liquid level. The air comes into of bottom stripper through air distributor and the air passes through the C5 liquid layer where the first-stage absorption is conducted, and then through two layers of bubble cap tray where the second- and the third-stage absorptions are conducted. The combustible component contained within the air can reach more than 36%. At the tower top the air is sent to mixer where it is mixed with external air to reduce its combustible component concentration to 25-28% and the mixed gas then comes into buffer tank.

Description

The method of preparing civil gas by absorbing 5 C light hydrocarbon using air

The present invention relates to a kind of petrochemical technology field, in particular for the method for preparing civil gas by absorbing 5 C light hydrocarbon using air.

Carbon five is chemically belonging to light hydrocarbon, is the hydrocarbon polymer that contains five carbon atoms, also contains a spot of carbon four or carbon sixty percent minute, carbon five is the transparent liquid of no colour band smell at normal temperatures and pressures, though calorific value is high, normal temperature gasification difficulty down is difficult to as the combustion gas utilization.For many years it is outwelled or burn as Industrial Boiler fuel as LPG (liquefied petroleum gas) residual liquid.And China's carbon five aboundresources come source electrode wide, and as field condensate, the lightweight oil fraction of refinery and Ethylene in Petrochemical Enterprises carbon five all are this fuel, and it is great wastes that these fuel can not get development and use.

Made the vaporization of 5C light hydrocarbon oil that 1. heating method is arranged, heating makes it be issued to its boiling temperature vaporization at normal pressure in the past; 2. add some catalyzer and make it reduce boiling temperature, vaporization at normal temperatures and pressures; 3. vacuumize and reduce the boiling point of liquid temperature, make its vaporization; More than three kinds of methods all can't resolve the difficult problem of reduction dewfall under the normal temperature and pressure.

The objective of the invention is at above-mentioned the deficiencies in the prior art part, adopt air to feed in the 5C light hydrocarbon oil, absorb carbon five with the gas formulation and make air mixture, this method can overcome condensation trouble, and can carry at a distance.

Content of the present invention, the present invention is disclosed as follows in conjunction with Figure of description 1-4: the raw materials used 5C light hydrocarbon oil of the present invention is by LPG (liquefied petroleum gas) residual liquid, field condensate, practice the lightweight oil fraction of oily factory or the oil that the chemical enterprise cracking of ethylene comes, the major equipment that uses in the technology has light carbon five basins of hydrocarbon (1), gas stripping column (3), air cushioning jar (4), dispenser (7), combustion gas surge tank (8); Its technical process is as follows: at first by schema device systems is carried out gas-tightness test, then, start hydrocarbon pump (2) 5C light hydrocarbon oil is squeezed into gas stripping column (3) from gas stripping column (3) top, make the two-layer bubble cap disc (16) on top be full of fluid, at the bottom of from upflow tube (15) overflow to tower, make height of liquid layer reach 0.5 meter-0.8 meter, start air compressor machine (6), air enters flaring air-distributor (17) by air buffer (4) and blast main (5) from gas stripping column (3) bottom with 0.2-0.4Mpa pressure, air-distributor (17) is suitable for reading distribution of net (12), with air distribution is small air-flow, this air-flow bubbling in the 5C light hydrocarbon liquid layer rises, about 50% of absorption of light hydrocarbon carbon five total amounts, make that combustiblecomponents reaches 15-20% in the gas, this is first section absorption, the bubble-cap (14) that gas continues to rise from lower floor's bubble cap disc (16) enters its 5C light hydrocarbon liquid layer, bubbling comes out from liquid layer, further absorption of light hydrocarbon carbon five, bubble-cap (14) from upper strata bubble cap disc (16) enters its 5C light hydrocarbon liquid layer at last, bubbling comes out from liquid layer, finish second, three sections absorptions, this moment, comhustible component can reach 30-36%, for making inflammable gas that stability be arranged, and elimination goes out the drop in the tower combustible gas, leave the space more than 0.5 meter on the top of upper strata bubble cap disc (16), stainless steel liquid removing net (13) is housed between the upper end cover ring flange; Tower bottom leaves waste liquid relief outlet (19); Inflammable gas is come out to the dispenser that the porcelain ring filler is housed (7) by cat head, makes gas concentration reduce to 25-28% with air mixed from air cushioning jar (4), enters combustion gas surge tank (8) and gas line (9) at last.

System oxygen therapy processing condition are in the technological process: temperature is a normal temperature more than 0 ℃; Pressure is 0.0-0.01Mpa in combustion gas surge tank (8), is 1.5-2.0Kpa before user's kitchen range; Gas concentration is 25-28% in the combustion gas surge tank (8).

Absorption of air hydrocarbon carbon five oil is compared as follows with the artificial coal gas quality standard of national regulation: sequence number national regulation artificial coal gas quality standard 5C light hydrocarbon oil, air 1 matter project standard combustion gas quality standard 2 Hua Baijing numbers variation ± 5% ± 5% 3 combustionproperties and parameter index are with the identical 4 foreign matter content MJ/m of kitchen range ³14.651 above 38.72-43.37

Tar and dust＜10 do not have

Hydrogen sulfide＜20 0.0007

Carbon monoxide≤10% does not have

Equipment in the technical process of the present invention, except that gas stripping column (3) wherein, all the other equipment all are the equipment that belongs to prior art of outsourcing, gas stripping column (3) is to use 5C light hydrocarbon oil---the key equipment of air system domestic gas, its structure is shown in Fig. 2-4, the air-distributor (17) of one toroidal is arranged at the interior bottom of tower shell (18), its outlet is equipped with the air distribution net (12) of stainless steel, there is the first layer bubble cap disc (16) middle and upper part, be provided with second layer bubble cap disc (16) again, between tower shell (18) upper end cover flange, stainless steel liquid removing net (13) is arranged, be evenly distributed with bubble-cap (14) on the two-layer bubble cap disc (16), air enters under bubble-cap (14), and between slit, turn back and from the 5C light hydrocarbon liquid of bubble cap disc (16), pass through, a side of two bubble cap discs (16) has upflow tube (15) up and down, it is opposite that the upflow tube of two bubble cap discs (15) is provided with direction, 5C light hydrocarbon oil under overhead streams flows into last layer bubble cap disc (16) earlier, liquid level rises to overflow port and gets off to following one deck bubble cap disc (16) with regard to overflow, overflow is at the bottom of the tower again from following one deck bubble cap disc (16), and tower bottom is equipped with waste liquid relief outlet (19).

Advantage of the present invention is: adopt the equipment of the gas stripping column (3) of design voluntarily as 5C light hydrocarbon oil one air system domestic gas, make air divide three sections to contact with a 5C light hydrocarbon is oily in tower, can make that comhustible component content reaches more than 35% in the combustion gas.And gas stripping column (3) compact construction, volume is little, installs to take up an area of to lack; The efficient height, system gas ability is big, and cost is low.

Description of drawings:

Fig. 1 process flow sheet of the present invention;

Fig. 2 gas stripping column internal structure and schematic diagram;

The local figure of Fig. 3 bubble cap disc bubble-cap;

The local figure of Fig. 4 bubble cap disc upflow tube;

Fig. 5 process implementing illustration.

Embodiment, Fig. 5 are process implementing mode of the present invention.

Start the hydrocarbon pump, 5C light hydrocarbon oil extracted out from the 5C light hydrocarbon oil tank through filter (11), squeeze into from gas stripping column (3) top, make the two-layer bubble cap disc on top be full of fluid after, overflow makes the bottom liquid layer height reach 0.8 meter at the bottom of tower; Air divides three sections to contact with 5C light hydrocarbon oil in tower, first section air enters the air-distributor (17) of toroidal from the gas stripping column bottom by air cushioning jar (4) and blast main (5) with the pressure of 0.3Mpa, distribution of net (12) is equipped with on air-distributor (17) top, air distribution is become small air-flow, at the bottom of tower, pass through the 5C light hydrocarbon liquid layer, produce the bubbling effect, but 50% of absorption of light hydrocarbon carbon five total amounts, comhustible component accounts for 15-20%, air continues to rise and enters lower floor and upper strata bubble cap disc (16) successively, carry out second, three sections absorption of light hydrocarbon carbon five, further improve comhustible component content in the combustion gas, reach more than 35%, for making inflammable gas have stability, and drop in the elimination inflammable gas, leave space more than 0.5 meter above the bubble cap disc of upper strata, stainless steel liquid removing net (13) is housed in the middle of the gas stripping column upper end cover ring flange, inflammable gas goes out tower by top of tower and enters the dispenser (7) that the porcelain ring filler is housed by hydrocarbon gas pipe (10), process blast main (5) makes the concentration of inflammable gas reduce to 25-28% from the air mixed of air cushioning jar (4), enter combustion gas surge tank (8), pressure is 0.02Mpa.Again through potentiostat (12) to finished product gas line (9), at last to the user.

Claims

1, a kind of method of preparing civil gas by absorbing 5 C light hydrocarbon using air, it is characterized in that: the used raw material 5C light hydrocarbon oil of the present invention is by LPG (liquefied petroleum gas) residual liquid, field condensate, practice the lightweight oil fraction of oily factory or the oil that the chemical enterprise cracking of ethylene comes, the major equipment that uses in the technology has light carbon five basins of hydrocarbon (1), gas stripping column (3), air cushioning jar (4), dispenser (7), combustion gas surge tank (8); Its technical process is as follows: at first by schema device systems is carried out gas-tightness test, then, start hydrocarbon pump (2) 5C light hydrocarbon oil is squeezed into gas stripping column (3) from gas stripping column (3) top, make the two-layer bubble cap disc (16) on top be full of fluid, at the bottom of from upflow tube (15) overflow to tower, make height of liquid layer reach 0.5 meter-0.8 meter, start air compressor machine (6), air enters flaring air-distributor (17) by air buffer (4) and blast main (5) from gas stripping column (3) bottom with 0.2-0.4Mpa pressure, air-distributor (17) distribution of net (12) that is equipped with suitable for reading, with air distribution is small air-flow, this air-flow bubbling in the 5C light hydrocarbon liquid layer rises, about 50% of absorption of light hydrocarbon carbon five, make that combustiblecomponents reaches 15-20% in the gas, this is first section absorption, the bubble-cap (14) that gas continues to rise from lower floor's bubble cap disc (16) enters its 5C light hydrocarbon liquid layer, bubbling comes out from liquid layer, further absorption of light hydrocarbon carbon five, bubble-cap (14) from upper strata bubble cap disc (16) enters its 5C light hydrocarbon liquid layer at last, bubbling comes out from liquid layer, finish second, three sections absorptions, this moment, comhustible component can reach 30-36%, for making inflammable gas that stability be arranged, and elimination goes out the drop in the tower combustible gas, leave the space more than 0.5 meter on the top of upper strata bubble cap disc (16), stainless steel liquid removing net (13) is housed between the upper end cover ring flange; Tower bottom leaves waste liquid relief outlet (19); Inflammable gas is come out to the dispenser that the porcelain ring filler is housed (7) by cat head, makes gas concentration reduce to 25-28% with air mixed from air cushioning jar (4), enters combustion gas surge tank (8) and gas line (9) at last.

2, the method for absorption of air carbon five oily gases according to claim 1 is characterized in that: system gas transmission processing condition are: temperature: normal temperature more than 0 ℃; Pressure: combustion gas is 0.03-0.01Mpa in the combustion gas surge tank (8), is 1.5-2.0Kpa before user's kitchen range; Gas concentration: concentration is 25-28% in the combustion gas surge tank (8).