Liquefied natural gas (LNG) plant emptying gas retrieving arrangement
One, technical field: what the present invention relates to is a kind of liquefied natural gas plant emptying gas recovery technology, particularly liquefied natural gas (LNG) plant emptying gas retrieving arrangement.
Two, background technology: liquefied natural gas (LNG) plant has some Sweet natural gases or other inflammable gas because security needs are discharged in the atmosphere in driving, parking and normal productive process.Be discharged into Sweet natural gas or other inflammable gas in the atmosphere in order to handle these, prior art is to adopt the torch facility that these Sweet natural gases or other inflammable gas are burnt both at home and abroad, is unfavorable for the raising of factory economy benefit.Some are arranged is cryogenic natural gas liquids because these are discharged into Sweet natural gas in the atmosphere, and the upstream of prior art torch facility on the emptying house steward is provided with the gas-liquid separator of charged well heater, natural gas liquids is heated into enter the torch facility again behind the gas and burn.Because of the natural gas liquids and the temperature of steam or other low temperature inflammable gas thereof of discharging very low, the material of the blow-down pipe valve pipe fitting of prior art liquefied natural gas (LNG) plant, gas-liquid separator, torch facility is 0Cr18Ni9 low temperature stainless steel, increase procurement of materials expense, executive cost and the difficulty of construction of liquefied natural gas (LNG) plant, be unfavorable for shortening the procurement cycle of material, equipment and the duration of whole factory.In order to prevent the tempering of torch facility, guarantee the safety of liquefied natural gas (LNG) plant, prior art enters the emptying house steward with a certain amount of Sweet natural gas and makes molecular seal gas, and keeping whole emptying house steward's malleation, and the facility that applies a torch is burnt.For guaranteeing that the inflammable gas that factory at any time discharges all can be burnt, prior art torch facility is provided with pilot burner, and small amounts of natural gas is given the pilot burner air feed always, guarantees that pilot burner is in state of combustion always.Because factory burns to molecular seal gas and pilot burner supply Sweet natural gas and by the torch facility, has additionally increased the consumption of liquefied natural gas (LNG) plant to Sweet natural gas, is unfavorable for the reduction of factory's energy consumption and the raising of economic benefit always.
Three, summary of the invention: the objective of the invention is to overcome the prior art above shortcomings, a kind of liquefied natural gas (LNG) plant emptying gas retrieving arrangement is provided, the object of the present invention is achieved like this, be by fuelgas pipeline, fuel gas relief valve group, fuel gas safety valve group, individual event valve, ice chest, LNG tank, ice chest emptying natural gas liquids well heater, LNG tank emptying gas well heater, the emptying house steward, emptying house steward voltage-controlled valve group, the emergency blow-down valve, emptying house steward safety valve group, water-sealed tank, spark arrester, the emptying tube, the pipeline valve pipe fitting is formed by connecting, the inlet of ice chest is provided with carbon steel natural gas line valve pipe fitting, outlet is connected with LNG tank by low temperature stainless steel pipeline valved tube spare, and ice chest also is provided with refrigerant lines valve pipe fitting; LNG tank is a double insulation structure, and its gaseous phase outlet is connected with LNG tank emptying gas well heater by low temperature stainless steel pipeline valved tube spare; LNG tank emptying gas heater outlet is by carbon steel pipe line valve pipe fitting and the total pipe coupling of emptying; The outlet of ice chest also is connected with ice chest emptying natural gas liquids well heater by low temperature stainless steel pipeline valved tube spare, and ice chest emptying natural gas liquids heater outlet is by carbon steel pipe line valve pipe fitting and the total pipe coupling of emptying; In the factory other all normal temperature blow-down pipe valve pipe fittings all with the total pipe coupling of emptying; The emptying house steward is provided with carbon steel pipe line valve pipe fitting and is connected with fuelgas pipeline after the pressure regulation, and this connection line is provided with individual event valve, and fuelgas pipeline is provided with relief valve group and safety valve group; The emptying house steward is provided with relief valve group, emergency blow-down valve and safety valve group, and its downstream is provided with water-sealed tank, and the outlet of water-sealed tank is connected with the emptying tube by carbon steel pipe line valve pipe fitting; Water-sealed tank also is provided with carbon steel water-line valve pipe fitting and carbon steel water discharge line valve pipe fitting; Pipeline between water-sealed tank and the emptying tube is provided with spark arrester; Ice chest is aluminum products, LNG tank emptying gas well heater, ice chest emptying natural gas liquids well heater are the aluminium-made air temp type vaporizer, and the material of pipeline valve pipe fitting, fuelgas pipeline, emptying house steward, water-sealed tank, spark arrester and the emptying tube in LNG tank emptying gas well heater, ice chest emptying natural gas liquids well heater downstream is the normal temperature carbon steel.
Adopt the present invention, factory all need the low-temperature liquefaction Sweet natural gas and the steam thereof of emptying all to be heated to be lighter-than-air normal temperature gaseous natural gas by the aluminium-made air temp type vaporizer, thereby the pipeline valve pipe fitting of aluminium-made air temp type downstream from vaporizer, the emptying house steward, water-sealed tank, the material of spark arrester and emptying tube is the normal temperature carbon steel, and cancelled the low temperature stainless steel gas liquid/gas separator of charged well heater, significantly reduced low temperature stainless steel equipment in the liquefied natural gas (LNG) plant, the consumption of pipeline valve pipe fitting, reduced equipment, the buying expenses of material and executive cost, reduce difficulty of construction, helped shortening the construction period of whole factory; The present invention all is recovered to fuel gas system with Sweet natural gas and other inflammable gas of emptying in liquefied natural gas (LNG) plant driving, parking and the normal productive process, avoided the discharging of factory's Sweet natural gas and other inflammable gas in driving, parking and the normal productive process, and because the present invention is provided with spark arrester and water-sealed tank, played the tempered effect that prevents, cancelled the discharging of molecular seal gas and pilot burner with Sweet natural gas, reduced the consumption of liquefied natural gas (LNG) plant to Sweet natural gas, reduce factory's energy consumption and working cost, improved the economic benefit of factory; The present invention is provided with perfect robot control system(RCS) and security system, and the security of device operation is guaranteed.
Four, description of drawings: Fig. 1 is the synoptic diagram of liquefied natural gas (LNG) plant emptying gas retrieving arrangement, among the figure 1, fuelgas pipeline 2, fuel gas relief valve group 3, fuel gas safety valve group 4, individual event valve 5, ice chest 6, LNG tank 7, ice chest emptying natural gas liquids well heater 8, LNG tank emptying gas well heater 9, pipeline valve pipe fitting 10, emptying house steward 11, emptying house steward voltage-controlled valve group 12, emergency blow-down valve 13, emptying house steward safety valve group 14, water-sealed tank 15, spark arrester 16, emptying tube
Five, embodiment: in Fig. 1, the inlet of ice chest 5 is provided with carbon steel natural gas line valve pipe fitting 9, and outlet is connected with LNG tank 6 by low temperature stainless steel pipeline valved tube spare 9, and ice chest 5 also is provided with refrigerant lines valve pipe fitting 9; LNG tank 6 is a double insulation structure, and its gaseous phase outlet is connected with LNG tank emptying gas well heater 8 by low temperature stainless steel pipeline valved tube spare 9; 8 outlets of LNG tank emptying gas well heater are connected with emptying house steward 10 by carbon steel pipe line valve pipe fitting 9; The outlet of ice chest 5 also is connected with ice chest emptying natural gas liquids well heater 7 by low temperature stainless steel pipeline valved tube spare 9, and 7 outlets of ice chest emptying natural gas liquids well heater are connected with emptying house steward 10 by carbon steel pipe line valve pipe fitting 9; Other all normal temperature blow-down pipe valve pipe fittings 9 all are connected with emptying house steward 10 in the factory; Emptying house steward 10 is provided with carbon steel pipe line valve pipe fitting 9 and is connected with fuelgas pipeline 1 after the pressure regulation, and this connection line is provided with individual event valve 4; Fuelgas pipeline 1 is provided with relief valve group 2 and safety valve group 3; Emptying house steward 10 is provided with relief valve group 11, emergency blow-down valve 12 and safety valve group 13, and its downstream is provided with water-sealed tank 14, and the outlet of water-sealed tank 14 is connected with emptying tube 16 by carbon steel pipe line valve pipe fitting 9; Water-sealed tank 14 also is provided with carbon steel water-line valve pipe fitting 9 and carbon steel water discharge line valve pipe fitting 9; Pipeline between water-sealed tank 14 and the emptying tube 16 is provided with spark arrester 15; Ice chest 5 is aluminum products, LNG tank emptying gas well heater 8, ice chest emptying natural gas liquids well heater 7 are the aluminium-made air temp type vaporizer, and the material of pipeline valve pipe fitting 9, fuelgas pipeline 1, emptying house steward 10, water-sealed tank 14, spark arrester 15 and the emptying tube 16 in LNG tank emptying gas well heater 8, ice chest emptying natural gas liquids well heater 7 downstreams is the normal temperature carbon steel.