CN1232616C - Method for producing pipe gas utilized in towns from material of liquid light hydrocarbon - Google Patents

Abstract

The present invention discloses a method for producing coal gas in a pipeline by liquid light hydrocarbon as raw materials, which comprises the following steps: (A) a combustion reforming furnace is used for heating; (B) water vapor is used for blowing, namely that the water vapor is introduced in the combustion reforming furnace; (C) the reformation is carried out; after liquid light hydrocarbon used as raw materials enters a mixing chamber to be thoroughly mixed with the water vapor, CO and H2 are generated under the action of a catalyst in a reforming chamber; (D) reformed gas enters a cooling heat increasing tower for regulating the heat value and the combustion characteristic of the gas. The present invention uses the liquid light hydrocarbon as the raw materials for producing coal gas in a pipeline, the cost is greatly reduced, and the existing liquid light hydrocarbon resources are full utilized. The present invention has large economic benefit, social benefit and environmental protection benefit.

Description

With the liquid lighter hydrocarbons is the method for raw material production cities and towns piped gas

Technical field

The present invention relates to a kind of is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons.

Background technology

Occurring in nature is called hydro carbons by hydrocarbon two kinds of elementary composition materials, as oil, Sweet natural gas.Coming from oil production also all is hydrocarbons with the Sweet natural gas of refining production, liquefied petroleum gas (LPG), stable light hydrocarbon, gasoline, diesel oil etc.From whole petroleum composition, the lighter hydrocarbons that are used for gas raw material are a certain section boiling ranges of petroleum composition, and from the Petrocarbon atomic arrangement, first section is Sweet natural gas, and carbonatoms is 1 or 2, claim methane or ethane.Second section is liquefied petroleum gas (LPG), and carbonatoms is C3, C4.These two sections are used to industrial chemicals and high quality gas fuel, are gaseous substance.If will make its liquefaction then must lower the temperature or processed compressed promptly so-called natural gas liquids (LNG) and liquefied petroleum gas (LPG) (LPG) to it.The 4th section promptly global important source material---gasoline of carbon atom arrangement, carbonatoms is from C7～C12.

It is C5 (pentane) that the liquid lighter hydrocarbons belong to the 3rd section of carbon atom arrangement, is in a liquid state under the normal temperature and pressure.It is the byproduct in oil production and refining and the gas conditioning process, and the same compositions such as benzene, methyl alcohol, alkene that do not contain with liquefied petroleum gas (LPG) are the fine clean fuels, and it is very extensive to originate.Lighter hydrocarbons differ at different occasion calls such as oil field, gas fields, as lightweight oil, condensate oil, pentane oil, stable light hydrocarbon, tops, sherwood oil, Gas Purification Factory " oil at the bottom of the tower " etc.Lighter hydrocarbons belong to saturated hydrocarbons, spontaneous ignition temperature is lower than liquefied petroleum gas (LPG), saturation vapour pressure under the uniform temp is also much lower than liquefied petroleum gas (LPG), and its boiling temperature is 36.4 ℃, compares with liquefied petroleum gas (LPG), owing to be difficult for gasification, it is little, safer to leak the back spreading range, and its limits of explosion and liquefied petroleum gas (LPG) are close substantially, the gas phase calorific value is higher than liquefied petroleum gas (LPG), and the liquid phase calorific value is then identical with liquefied petroleum gas (LPG).

Because the vapour pressure of liquid lighter hydrocarbons is between liquid fuel and geseous fuel, as geseous fuel, the difficult gasification of liquid lighter hydrocarbons, transfer pressure is low and require envrionment temperature height, caliber big, and the most thorny is that it liquefy very easily again, and the conveying difficulty is not little; And as liquid fuel, the vapour pressure of liquid lighter hydrocarbons is higher again, and the transportation storage facility all will meet the pressurized vessel management expectancy, and investment is big, transportation storage cost height.Therefore, all the time, people are insufficient to the development and use of liquid lighter hydrocarbons, and are blank especially with its research as cities and towns piped gas system gas raw material.At present, as outside the stove fuel, part is used for ethylene project to liquid lighter hydrocarbons depolarization on a small quantity, and many liquid lighter hydrocarbons are burnt by point " day lamp ".

Liquid light hydrocarbon feed price is different according to the market situation and the place of production, generally hangs down 500～600 yuan than liquefied petroleum gas (LPG) is per ton, low about 800 yuan per ton than diesel oil.Because pentane is liquid at normal temperatures and pressures, under interests drove, minority illegal businessman mixed it in liquid gas storage tank or the service station, causes the liquefied pot raffinate to increase, and quickens the damage of automobile parts and the discharging of increase automobile exhaust pollution thing.The output of the present liquid lighter hydrocarbons of China is than horn of plenty, and do not have and utilize outlet preferably, annual more than 500 ten thousand tons of cheap and good-quality liquid light hydrocarbons fail to obtain scientific and reasonable utilization, have caused the significant wastage of resource, are unfavorable for the Sustainable development of national economy, the energy, environment.

Make a general survey of gas industry, at present, combustion gas manufacturing enterprise is raw material production cities and towns piped gases with liquefied petroleum gas (LPG) (LPG) mostly both at home and abroad.As a kind of clean energy, liquefied petroleum gas (LPG) has many good qualities, environmental benefit is remarkable, but also have certain limitation, rising and falling as price change causes the gas production cost unstable and on the high side etc. greatly, and domestic liquefied petroleum gas (LPG) market requirement breach reaches 7,000,000 tons/year, dependence on import solves fully, have a big risk, the particularly domestic strategic reserves that does not have certain scale so far is difficult to evade the risk that International Speculative Capital or oil monopoly capital are stirred up trouble.

Summary of the invention

The object of the present invention is to provide a kind of is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons.

It is the goal of the invention of raw material production cities and towns piped gas that the present invention reaches by the following technical programs with the liquid lighter hydrocarbons, and this method may further comprise the steps:

(A) heating flame upgrading stove (2), described burning upgrading stove (2) comprises combustion chamber (21), mixing section (22) and upgrading chamber (23), the heating of burning upgrading stove (2) is to mix with excess air by raw material liq lighter hydrocarbons atomizing back, burns to emit heat and realize in combustion chamber (21);

(B) water vapor purging promptly feeds water vapor, makes in combustion chamber (21), mixing section (22) and upgrading chamber (23) to be full of water vapor, and indoor original air and oxide compound are blown into smoke stack emission.

(C) upgrading, promptly the raw material liq lighter hydrocarbons enter mixing section (22), behind the steam thorough mixing, are active catalyst catalyzed reaction under 600～900 ℃ of temperature in upgrading chamber (23) through nickel, generate CO and H ₂

(D) combustion gas behind the upgrading enters the calorific value and the combustioncharacteristics of cooling gain of heat tower allotment combustion gas.

Described liquid lighter hydrocarbons are tops.

With the liquid lighter hydrocarbons is that raw material upgrading production city gas is the catalyzed reaction of a heat absorption.Heating phase (A) liquid lighter hydrocarbons and excess air burner generate CO ₂And H ₂O, the combustion heat are used for the modifying catalyst of heating flame chamber checker brick and upgrading chamber; The setting in steaming out stage (B) is individual for the peace of upgrading process, avoids hydrocarbon and oxygen mix to reach limits of explosion; At upgrading stage (C), on the beds, following reaction takes place in hydrocarbon and superheated vapour:

Finally, the product combustion gas is with H ₂, CO, CO ₂, CH ₄, C ₂H ₄, N ₂Be major ingredient, enter the calorific value and the combustioncharacteristics of cooling gain of heat tower allotment combustion gas, become the cities and towns piped gas and enter gas ductwork.

The present invention is a raw material with tops or other liquid lighter hydrocarbons, adopt catalystic pyrolysis to produce to meet that " manufactured gas, manufactured fuel gas 5R-7R " and " Sweet natural gas 6T-13T " reaches the interior combustion gas of " liquefied petroleum gas (LPG) 19Y-22Y " scope in the classification of GB (GB/T13911-92) gas, be particularly suitable for gas production enterprise original system is carried out energy-conservation, dilatation technological transformation, cat-cracker can be transformed on the basis of former gas making device and form, and is spent not high.

Project state of the art of the present invention is in leading domestic ranks, at the energy and gas industry good popularizing application prospect is arranged, and can produce tangible economic benefit.Substitute LPG production cities and towns piped gas with tops,, can reduce the source of the gas production cost by a relatively large margin because of its price is lower than LPG.Generally speaking, the tops unit price is low by 20% than LPG, can reduce source of the gas production cost 10%-15%.The output of the annual liquid light hydrocarbon in the whole nation reaches 5,000,000 tons, and market outlook are wide.The present invention also has environmental benefit preferably: the tops sulfur-bearing is low, SO during burning ₂Discharge lessly, no black smoke produces, and essentially no sewage discharge belongs to cleaning raw material production.Can realize cleaner production management, supervision technology and resources untilization maximization and the minimized target of blowdown.In addition, the present invention also has obvious social: with the raw material supply route of gas enterprise gas making device, be adjusted into two raw materials even many raw material supplies route by single raw material, tops (liquid lighter hydrocarbons) product is rationally utilized, for this product finds an ideal outlet, stop it and flow in some illegal businessman's hands; And as remedying a kind of means that domestic oil gas strategic reserves lacks, evading international risk has its far-reaching politics, economy and social effect especially.

Description of drawings

Fig. 1 is a catalystic pyrolysis gas-made technology schema of the present invention

Fig. 2 for upgrading air cooling of the present invention but, gain of heat system process figure

Embodiment

Be illustrated in figure 1 as technological process of production figure of the present invention.

Tops in the raw material tank field is delivered to the distribution piping in gas making device district by the tops pipeline after the pressurization of hydrocarbon pump, deliver to upgrading spray gun, heat gun, igniting spray gun, gain of heat spray gun by distribution piping again.Excessive tops is back to the tops storage tank after the pressure controlled valve decompression, to guarantee gas making device district tops house steward constant pressure.

One cover gas making device adopts two to be production line.Each is that be 120 seconds the cycling time of each working cycle of production line, mainly is divided into heating and upgrading stage.Need between each stage with steam and air purge reactor to guarantee safety and to improve thermo-efficiency, two is to hocket in the heating phase and upgrading stage of production line, promptly first is production line when being in the heating phase, and second is that production line is in the upgrading stage, to guarantee the total system material balance.System gas working cycle comprises 8 steps altogether, as following table 1:

Table 1

Step	Time S	State	Title (explanation)
				1	2.4	Close	Air purge
2	3.6	Close	Burner starts the heating beginning
				3	52.8	Open	Heating phase
4	1.2	Open	Air purge
				5	3.6	Open	Steaming out
6	3.6	Close	Steaming out
				7	49.2	Close	The upgrading stage
8	3.6	Close	Steaming out

Annotate: " opening " refers to lead to the main valve open of chimney, do not have gas to enter coal gas storage cabinet 8.

" pass " refers to close towards the main valve of chimney, and gas enters coal gas storage cabinet 8.The system jia bombardier illustrates suddenly:

Step 1---air purge (pass)

Air-blaster 1 is supplied with upright combustion chamber few air quantity of more normally loading.Air purges the combustion chamber by burner.Upgrading gas and steam remaining in the system are purged, and enter gas storage cabinet 8 by water seal, and the combustiblesubstance in the combustion chamber is removed.

Step 2---heating beginning (pass)

The main burner that is contained in top of combustion chamber is lighted by igniter burner kept burning day and night, the main burner underrun, and flame safety assurance device and flame monitoring are started working.If main burner is not lighted, flame monitoring is less than flame, and then raw material tops valve is closed automatically, and each valve is got back to secure location, and carries out safe purging, prevents that tops and the air do not lighted from blasting in stove.

Step 3---the heating phase (opening)

Heating phase, mix with excess air liquid phase tops atomizing back, in the combustion chamber internal combustion, generates H ₂O and CO ₂, its reaction formula is

The indoor checker brick of convection heat heating flame of the radiant heat of combustion flame and combustion exhaust; Thermal process gas is by upgrading chamber catalyzer then, and the heat part that catalyzer absorbed is from Ni and O ₂Reaction heat, a part is from the sensible heat of process gas.

The high temperature of heating phase can be burnt the carbon of upgrading phase deposition on catalytic bed, and nickelous sulfide is decomposed, and produces CO ₂And SO ₂, take away with flue gas, help keeping activity of such catalysts.Heating phase provides enough heats, and in order to the required heat of balance upgrading reaction and the heat of thermal radiation loss, and sedimentary sulphur all is removed after peroxidation on split product and the catalyzer.

Discharge from chimney after passing the waste heat boiler of 1.6MPa and energy-saving appliance through the flue gas of reactor outlet.Because tight water seal is arranged, flue gas can not enter coal gas system.

Step 4---air purge (opening)

Heating phase, (in short-term) swept in laggard line space air-blowing, and the heat gun variable valve keeps little fiery aperture, and residue oxidation products in combustion chamber and the upgrading chamber is blown into chimney.

Step 5---steaming out (opening)

The upgrading steam valve is opened, and steam is blown into the combustion chamber and flows through the upgrading chamber, purge thing through waste heat boiler from the chimney emptying.

Step 6---steaming out (pass)

Continuity continues to feed steam on last stage, and the chimney valve cuts out, and purges thing and enters the combustion gas cooling tower, and this step makes and has been full of steam in the upgrading stove and prepared to produce city gas.

Step 7---the upgrading stage (pass)

Close the chimney valve, upgrading system gas formally begins, behind the vapor removal water of condensation, from heated checker brick of heating phase and directly over be blown into, and be superheated to more than 900, enter beds again through horizontal mixing section and gas phase tops thorough mixing then, the upgrading reaction takes place.Reduction reaction also takes place in this stage, and NiO is reduced into Ni, and organic component is oxidized to carbonic acid gas and water simultaneously.After reduction reaction finishes, actual upgrading reaction beginning.

In the upgrading stage, the time remaining in this step is longer, and this stage tops gasification back and heated superheated vapour behind the thorough mixing, under the modifying catalyst effect, generate CO and H in mixing section ₂, react and be

The valve that leads to chimney is closed.At this moment another line is in the heating phase.

Upgrading gas enters follow-up system again through the waste heat boiler recovery heat of 1.6MPa---cooling gain of heat tower.

Step 8---steaming out (pass)

, carry out primary steam and purge after the stage through upgrading, the indoor residual inflammable gas of upgrading is blown out, for next circulation is prepared.So far, a complete working cycle finishes.

For improving the thermo-efficiency of gas making device, behind reactor, be provided with the sensible heat that waste heat boiler is used to reclaim system gas, heating two stage flue gases and upgrading gas, the 1.6MPa steam major part that produces is delivered to the steam turbine air-blaster as power, part enters the steam buffer jar and uses as production process steam through pressure regulation.The purpose that adopts steam turbine air-blaster (band converter plant) is the consideration for balance of steam in energy-conservation and the system gas area.

Upgrading gas goes out to give up pot after the water seal of chilling coal gas goes the coal gas cooling tower to be lowered the temperature by cool water shower, and the liquid phase tops utilizes the gasification of upgrading gas sensible heat after cooling tower sprays into, and reaches the purpose of the cooling of upgrading gas, calorific value raising and allotment combustioncharacteristics simultaneously.

The combustioncharacteristics of product combustion gas can and be adjusted operational condition and regulate by the tops gain of heat.

Technology of the present invention requires as following table 2 quality index of raw material:

Table 2

Sequence number	Project	Design load
			1	Olefin(e) centent	≤20％
2	Sulphur	≤148ppm
			3	H 2S	＜40ppm
4	Lead content	≤100ppm
			5	Liquid low heat value	45.44(MJ/kg)
6	The gaseous state low heat value	164.82(MJ/Nm3)

The catalyzer that technology is selected for use among the present invention is that 15～20mm spheric nickel is active metal catalyst, and model is a Ni-0901S3/4 " type.It is a kind of be carrier with Al, Si, be Primary Catalysts with Ni, Fe, Mg, Mn are the plyability catalyzer of promotor, Ni content requires according to the calorific value of upgrading gas and decides.By regulating heating tops flow and upgrading tops flow, realize that service temperature is adjustable in 600～900 ℃ scope, but will notice that reaction bed temperature can not be higher than 900 ℃.Plumbous, basic metal can make poisoning of catalyst, so will limit lead, alkali metal content in the raw material.Catalyzer physico-chemical property such as following table 3:

Table 3

Ni content	Tap density	Resistance to compression Zhang Du	Normal running temperature
					Catalytic bed top	The catalytic bed bottom

4.5～5.5％

1100～1300kg/m 3

60～160kg/cm 2

700～800℃

700～800℃

When the steam deficiency, can produce a large amount of carbon distributions under the insufficient situation of steaming out between cold operation or step, these carbon can be burnt in oxidation, but will notice that reaction bed temperature can not be higher than 900 ℃.

The component of tops upgrading gas can change along with the variation of raw material composition, catalyst performance and temperature of reaction, and following parameter list is upgrading gas component and the burning performance parameter under a certain operational condition: (seeing Table 4)

Table 4

Sequence number	Component	Unit	Upgrading gas
				1	H 2	Volume %	66.46
2	CO	Volume %	18.41
				3	CH 4	Volume %	2.09
4	C 2H 6	Volume %	0.10
				5	C 2H 4	Volume %	0.17
6	C 3H 8	Volume %	0.08
				7	C 3H 6	Volume %	0.09
8	C 4H 8	Volume %	0.16
				9	C 4H 10	Volume %	0.61
10	C 5H 12	Volume %	0.90
				11	CO 2	Volume %	9.76
12	O 2	Volume %	0.06
				13	N 2	Volume %	1.11
14	Lower heat value	MJ/Nm 3(Kcal/Nm 3)	12.91(3083.08)
				15	Superior calorific value	MJ/Nm 3(Kcal/Nm 3)	14.51(3464.80)
16	The white index of China	MJ/Nm 3(Kcal/Nm 3)	21.83(5213.51)
				17	Combustion potential	CP	119.47

Adjust the processing parameter and the catalyzer model of cat-cracker, change operational condition, above-mentioned upgrading gas component can change within the specific limits.According to the needs of different city gas combustioncharacteristicss, adjust the operational condition of cat-cracker or follow-up gain of heat system, can satisfy its corresponding requirements, produce qualified cities and towns piped gas.

One cover catalytic pyrolysis preparing gas system's (2 is production line) consumption indicators such as following table 5:

Table 5

Sequence number	Project name	Unit	Design load
				1	Tops	t/a	76440
2	Modifying catalyst	t/a	3.2
				3	Water of productive use	m3/h	7.5
4	Domestic water	m3/d	1.08
				5	Turbid circulating water	m3/h	150
6	Power consumption	103kwh/a	1532
				7	Upgrading tops proportion	％	93％
8	Heating tops proportion	％						7％

Process spent water of the present invention and flue gas and noise all can satisfy environmental administration's set quota requirement.The smoke components such as the following table 6 of actual measurement:

Table 6

Raw material	Smoke components (%)
									abt	O 2	CO 2	CO(mg/m 3)	NO X(mg/m 3)	.ST	.25	Vert
	Tops	267.0	3.4	11.8	427.5	42.5	11.5	11.6									26.2

Technical process major equipment of the present invention has

Burning upgrading stove 2:

Comprise the continuous U type structure that is in combustion chamber 21, horizontal mixing section 22 and Room 23, three, upgrading chamber.

The main effect in combustion chamber 21 be tops is fully atomized and with excessive air in this mixed firing, generate H ₂O and CO ₂, and emit a large amount of heats and be used to heat checker brick, catalyzer, for the thermo-negative reaction in transformation of the way stage provides heat.It is vertical steel shell, and the inboard is lined with the refractory brick of three layers of unlike material, its top install combustion device, and the flame of burner is downward incendiary.Building in the middle of the combustion chamber has arch bridge and checker brick, and as heat exchanger, the heating phase checker brick are heated to 1000～1100 ℃, and the steam in upgrading stage enters the combustion chamber from the checker brick top, is heated to about 900 ℃.

The upgrading reaction takes place and generates CO and H in the indoor Ni catalysis ball that is filled with of upgrading, the mixture of tops and water vapor herein ₂, mixing section, upgrading be indoor a refractory lining identical with the combustion chamber, upgrading is indoor a catalyst supporting structure, on 3.2 tons of catalysis balls are arranged, four thermopairs are arranged, at the bottom of the checker brick, mixing section, catalytic bed outlet also respectively have a thermopair in the catalytic bed.

A visor is housed on the combustion chamber observes burner nozzle and flame; The following direction observation that two visors are installed facing to the tops nozzle of checker brick just can be to the visual control of the spray pattern of tops; Top, upgrading chamber has a visor can observe catalytic bed carbon deposit and damaged condition thereof.

Waste heat boiler 3:

Mainly comprise vapour generator, drum two portions.Vapour generator is horizontal tube sheet tubular heat exchange, and cylindrical shell is Φ 2900*30,408 of total Φ 57*3L (L=5006mm) heat transfer tubes.The drum body is the horizontal container of Φ 1224*12, L=1.996, is installed in waste heat boiler top.Vapour outlet safety valve and bleeder are arranged at the drum top.Generating tube top and drum fuse, and drum is equivalent to the surge tank effect, and there is water-in the steam generator top, and two drains are arranged below.In addition, there is liquidometer the side.

Energy-saving appliance 4:

Energy-saving appliance 4 is square bodies of a joint heat transfer tube, and normal pressure equipment mainly is cooled to flue gas about 120 ℃, and upgrading gas is cooled to 120 ℃, and oiler feed is preheating to about 105 ℃ from 20 ℃.The deoxygenator that oiler feed after the preheating flows to the oiler feed groove enters waste heat boiler again.

Quencher 5 and water sealed tank 6:

The effect of quencher 5 is that upgrading gas is cooled to about 60～70 ℃ of temperature of saturation, and so-called chilling is exactly the water dew point that quenched water is vaporized coal gas, because the vaporization heat of water vapor makes the coal gas quick cooling to temperature of saturation.Quencher is made of a vertical ducting and two small nozzles.

Water sealed tank 6 is important safety equipment, and it only allows the upgrading air-flow to coal gas storage cabinet 8 directions, and the coal gas in the gas holder can not flow backwards.Water sealed tank is made up of the Steel Vessel that is filled with water.In container, the underwater is immersed in the bottom of quencher pipeline.

Upgrading air cooling but, gain of heat tower 7:

As shown in Figure 2, coal gas cooling gain of heat tower 7 is the upgrading gas that quencher further to be cooled to 36 ℃ tower type container, simultaneously, see through it with the gain of heat of upgrading gas to required calorific value index request.The coal gas cooling tower is a vertical tower body, Φ 2400, H15000, in 6 layers of water coolant nozzle are arranged, upgrading gas advances tower from the bottom, be cooled after meeting with water coolant is reverse from bottom to top, water coolant concentrates the bottom to flow out cooling tower by siphonic system in the tower, flows to underground tank.Cooling tower is equipped with 4 layers, every layer of 6 tops nozzle, the tops of gain of heat part sprays into from here, utilize upgrading gas the sensible heat gasification and with upgrading coal gas thorough mixing after send into gas holder.In this tower, can partly regulate the combustioncharacteristics of mixed gas.

Hydraulic efficiency system:

Two hydraulic oil pumps have the demonstration of start-stop state, status of equipment demonstration, top hole pressure alarm display, and the start-stop and the operational mode of switch panel control pump are arranged; The hydraulic efficiency oil cooling pump has start-stop and the operational mode that the start-stop state shows, status of equipment shows and have the switch panel control pump.Every is that production line has three hydraulicvalves, is respectively chimney valve, main air valve and secondary air-valve.Each valve has the start-stop state to show.

Robot control system(RCS):

The production process automatic control system that the present invention adopts can be according to processing requirement, and the redundant hierarchical network control mode that utilization is advanced at present realizes that on-the-spot temperature, pressure, flow, liquid level, valve position show in real time; The start-stop of the switch of valve, the adjusting of valve position, main rotating machinery (electric fan, turbine blower fan, hydraulic oil pump, boiler feedpump, hydrocarbon pump) etc. can be controlled by robot control system(RCS); The production processes such as control that the historic records of the sound and light alarm control of the control of the igniting of control, pilot burner and the main flame of the control of the control of boiler water level, the control of air quantity, blast, the control of tops flow, the total pipe pressure of tops, the control that starts production cycle, major equipment parameter, important productive capacity, failure modes (orderly shutdown, emergency, stop in emergency) are handled are also finished by robot control system(RCS).

Claims (6)

1, a kind of is the method for raw material production piped gas with the liquid lighter hydrocarbons, may further comprise the steps successively:

(C) heating flame upgrading stove (2), described burning upgrading stove (2) comprises combustion chamber (21), mixing section (22) and upgrading chamber (23), the heating of burning upgrading stove (2) is to mix with excess air by raw material liq lighter hydrocarbons atomizing back, burns to emit heat and realize in combustion chamber (21);

(D) water vapor purging promptly feeds water vapor, makes in combustion chamber (21), mixing section (22) and upgrading chamber (23) to be full of water vapor, and indoor original air and oxide compound are blown into smoke stack emission.

(E) upgrading, promptly the raw material liq lighter hydrocarbons enter mixing section (22), behind the steam thorough mixing, are active catalyst catalyzed reaction under 600～900 ℃ of temperature in upgrading chamber (23) through nickel, generate CO and H ₂

(F) combustion gas behind the upgrading enters the calorific value and the combustioncharacteristics of cooling gain of heat tower allotment combustion gas.Described liquid lighter hydrocarbons are tops.

2, according to claim 1 is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons, and it is characterized in that mixing section (22) two ends are connected with combustion chamber (21) and upgrading chamber (23) respectively becomes the burning of U-shaped structure upgrading stove (2).

3, according to claim 1 is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons, it is characterized in that a cover gas making device has two production lines, and the heating phase of two production lines and upgrading stage hocket.

4, according to claim 1 is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons, it is characterized in that reclaiming heat from the upgrading gas that burning upgrading stove (2) comes out through waste heat boiler (3).

5, according to claim 1 is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons, it is characterized in that also comprising before steps A is carried out following preparation step:

(a1) the liquid lighter hydrocarbons of raw material storage tank district (10) are delivered to the system gas area after being pressurizeed by hydrocarbon pump (9), and computer automatic control system system guarantees its constant pressure;

(a2) enter the combustion chamber and purge by gas blower (1) delivery air;

After the steps A heating, burning upgrading stove (2) is carried out air purge by the gas blower delivery air.

6, according to claim 1 is the method for raw material production cities and towns piped gas with the liquid lighter hydrocarbons, it is characterized in that step C upgrading after, upgrading chamber (23) are carried out water vapor purging.

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