Summary of the invention
The purpose of this utility model is to provide a kind of liquefied natural gas vaporization device, and this utilizes this vaporizing unit can solve existing liquefied natural gas vaporization device to have the problem that mode of heating is single, heat exchange efficiency is low.
Heating agent vaporizer, liquified natural gas vaporizer, gas heater in the middle of liquefied natural gas vaporization device in the utility model includes, wherein:
The enclosure interior of described liquified natural gas vaporizer is provided with not connected low temperature area and high-temperature zone, the inlet of described low temperature area is connected with the natural gas supply system sealing, the outlet and the natural-gas transfer pipeline of described high-temperature zone are tightly connected, and are provided with one between the outlet of described low temperature area and the inlet of high-temperature zone and can insert the heat exchanging tube that carries out heat exchange in the described middle heating agent vaporizer;
Heating agent liquid zone and steam state district in the middle of the enclosure interior of heating agent vaporizer is provided with in the middle of described, the heat exchanging tube of described liquified natural gas vaporizer is inserted described steam state district, and the outlet of described liquid zone, inlet and middle heating agent supply system are tightly connected;
The entry and exit of described gas heater and the conveyance conduit of rock gas are tightly connected, enclosure interior at gas heater is provided with a heat exchanging tube, this heat exchanging tube extend described gas heater housing and with described in the middle of heat exchanging tube one end in the heating agent vaporizer liquid zone be connected, the outlet of the other end of heat exchanging tube is tightly connected with the thermal medium supply system in the middle heating agent vaporizer liquid zone.
Heating agent holding vessel, middle heating agent transfer pump and pipeline and valve in the middle of the heating agent supply system includes in the middle of described, described middle heating agent holding vessel is an airtight pressure resistant vessel, is communicated with by pipeline with middle heating agent transfer pump.
Heating agent is the mixture of freon or alcohols or alkanes or freon, alcohols, alkanes in the middle of described.
Heat exchanging tube in the described liquified natural gas vaporizer takes the shape of the letter U.
Described heat exchanging tube inserts the steam state district of described middle heating agent vaporizer, and with described in the middle of the heating agent vaporizer shell be withdrawable being tightly connected, described heat exchanging tube extend described in the middle of the outer end of heating agent vaporizer by flange plate export with the low temperature area of described liquified natural gas vaporizer, the high-temperature zone inlet seal is connected.
Described heat exchanging tube is the titanium or titanium alloy pipe.
Thermal medium in the described thermal medium supply system is seawater, river, clear water or conduction oil.
All be connected between the entry and exit of the outlet of heating agent vaporizer liquid zone in the middle of described, inlet and middle heating agent supply system and described gas heater and the conveyance conduit of rock gas by flangeseal.
Described LNG Liquefied natural gas heater is the fixed tube sheet type structure.
Heating agent vaporizer shell inside is divided into liquid zone and steam state district by the dividing plate with mesh in the middle of described.
Liquefied natural gas vaporization device in the utility model can farthest improve the heat-exchange performance of equipment according to the heat transfer flow characteristic of thermal medium, middle heating agent, liquified natural gas and rock gas, and thoroughly solve thermal medium and easily form ice sheet at the liquified natural gas low temperature area, thereby heat transmission resistance increases, increase the problem of heat transfer complexity simultaneously, greatly improved the Security and the reliability of equipment operation.
Embodiment
As shown in Figure 1, the liquefied natural gas vaporization device in the utility model includes liquified natural gas vaporizer 1, middle heating agent vaporizer 2 and natural device heater 3, wherein:
Middle heating agent vaporizer 2 includes a seal casinghousing 20 of being made by low temperature material, the liquid zone 23 that is divided into the steam state district 22 and the bottom on top in housing 20 inside 20 by the dividing plate 21 with mesh (also can be the dividing plate that does not have mesh, be convenient to the through hole that liquid, gas stream are crossed) but be provided with at least one in the middle of the dividing plate.Liquid zone 23 is provided with an outlet 24 and one inlet 25, and this outlet 24, inlet 25 are tightly connected by flange plate and middle heating agent supply system, and formation one circulates.Heating agent holding vessel 26, middle heating agent transfer pump 27, conveyance conduit and valve in the middle of middle heating agent supply system includes, as shown in Figure 2, middle heating agent holding vessel 26 is an airtight pressure resistant vessel, heating agent (comprising freon, alcohols, alkanes and composition thereof) in the middle of being used for storing, and be connected by conveyance conduit with middle heating agent transfer pump 27, middle heating agent transfer pump 27 heating agent in the middle of the device initial stage of going into operation is used for pouring into, and replenishing middle heating agent when guaranteeing that whole device normally uses.Because middle heating agent holding vessel 26, middle heating agent transfer pump 27, output pipeline and valve and being connected each other are prior art, and are easy to just can realize as those skilled in the art, so detailed description no longer separately.
Liquified natural gas vaporizer 1 includes a housing 10 of being made by low temperature material, be divided into not connected low temperature area and high-temperature zone in housing 10 inner area, wherein the inlet 11 of low temperature area is tightly connected by flange plate and LNG Liquefied natural gas supply system 13, the outlet 14 of high-temperature zone is tightly connected by the conveyance conduit 4 of flange plate and rock gas, the outlet of low temperature area, be connected with the sealed at both ends of U-shaped heat exchanging tube 12 by flange plate 17 between the inlet of high-temperature zone, this U-shaped heat exchanging tube 12 is the titanium or titanium alloy pipe, its main body is inserted in the steam state district 22 of middle heating agent vaporizer 2 can take out form (being similar to the structure of drawer), and and middle heating agent vaporizer shell 20 between the joint make encapsulation process, because this structure can realize under without any creative work as those skilled in the art, does not therefore remake detailed description separately.Because in the middle of U-shaped heat exchanging tube 12 inserts in the steam state district 22 of heating agent vaporizer 2, can make the liquified natural gas in the U-shaped heat exchanging tube 12 carry out heat exchange, thereby U-shaped heat exchanging tube 12 interior LNG Liquefied natural gas are tentatively gasified with gas in the middle heating agent vaporizer 2.
Gas heater 3 adopts existing fixed tube-plate structure; it includes a housing of being made by low temperature material 30 and by expanded and welded tube joint and be fixed on the heat exchanging tube 31 of housing 30 inside with mode; in order to increase the working life of gas heater 3, scribble epoxy resin protective layer (not shown) on housing 30 inner surfaces.Be provided with outlet 32 and inlet 33 above housing 30,33 the other ends by flange plate and natural-gas transfer pipeline 4 that wherein enter the mouth are tightly connected, and outlet 32 is tightly connected with rock gas output main line 5.Heat exchanging tube 31 can feed seawater, river, clear water or heat conduction wet goods thermal medium, the outside of housing 30 is all extended at its two ends, wherein an end is tightly connected with the heat exchanging tube 29 that is located in the middle heating agent vaporizer liquid zone 23, and be communicating structure, the other end of heat exchanging tube 29 extends the outside of middle heating agent vaporizer shell 20 and is tightly connected by flange plate and thermal medium supply system 34, and the other end of heat exchanging tube 31 is direct and the thermal medium supply system is tightly connected, and constitutes a circulation.
As shown in Figure 2, the working procedure of liquefied natural gas vaporization device is as follows in the utility model:
Form three circulations during liquefied natural gas vaporization device busy in the utility model, in three circulations, various mode of heatings are made up mutually, thereby heat is replenished mutually, reach the purpose that improves the thermal efficiency.
First circulation of the present utility model is: regulate by the modulating valve in the natural gas supply system in 1 the low temperature area that enters liquified natural gas vaporizer behind the flow, go in the U-shaped heat exchanging tube 12 by the outlet of low temperature area again, with flow at high speed and with the form of convection heat exchange absorb U type heat exchanging tube 12 outer in the middle of the heat that transmits by the condensing heat-exchange form of heating agent steam, this partial liquefaction rock gas progressively heats up and gasifies like this, get back to the high-temperature zone of natural gas vaporizer 1 through U type heat exchanging tube 12, enter conveyance conduit 4 by the high-temperature zone outlet again, the stepping of going forward side by side is gone in the gas heater 3, with the form of convection heat exchange the heats in the heat exchanging tube 31 are passed to the rock gas that enters housing 30, and enter 5 outputs of gas transmission main line after it is heated to normal temperature, use.
Second circulation is: by the thermal medium behind the Flow-rate adjustment valve regulation flow (can be seawater, river, clear water or conduction oil) enter in the heat exchanging tube 31 in the gas heater 3, form with convection heat exchange is passed to heat the rock gas that enters in the gas heater housing 30, and enter gas transmission main line 5 after it is heated to normal temperature, in the heat exchanging tube 29 of the liquid zone 23 of heating agent vaporizer 2 in the middle of transition short segment 6 enters of the thermal medium after the release heat, middle heating agent in the middle of still heat being passed in the heating agent vaporizer 2 with the form of convection heat exchange, and make it to vaporize, and the temperature of thermal medium further reduces, and gets back to the thermal medium supply system from thermal medium delivery outlet 28.
The 3rd circulation is:
The liquid zone 23 of heating agent vaporizer 2 in the middle of the middle heating agent that provides by middle heating agent supply system enters, vaporize after having absorbed a large amount of heats of thermal medium in the heat exchanging tube 29, enter in the vapor phase space (steam state district 22) on housing 20 tops, run into condensation immediately behind the U-shaped heat exchanging tube 12, and at heat exchanging tube 12 outer walls formation liquid film and drop, in the case, middle heating agent steam is passed to LNG Liquefied natural gas in the heat exchanging tube 12 with the form of condensing heat-exchange with heat, and the middle heating agent drop that has discharged a large amount of heats leans on the weight of self to drop in the middle heating agent liquid of the lower housing portion that does not have vaporization, has formed natural circulation.
Above-mentioned three circulations just can realize the continuous heating of LNG Liquefied natural gas and so forth.
In sum, heating agent supply system in the middle of liquefied natural gas vaporization device in the utility model cooperates, the thermal medium regulating system, the liquified natural gas regulating system just can realize continuous heating, reach the purpose of effectively utilizing the thermal efficiency, wherein the thermal medium regulating system is made of thermal medium flow meter, its pipeline of flow control valve, valve, finishes the metering of thermal medium and the adjusting of flow.The LNG Liquefied natural gas regulating system is made of LNG Liquefied natural gas flow meter, its pipeline of flow control valve, valve the LNG Liquefied natural gas regulating system, finishes the metering of LNG Liquefied natural gas and the adjusting of flow.
This shows that the liquefied natural gas vaporization device in the utility model has following advantage:
1. after utilizing the vaporizing unit in the utility model three circulations are worked simultaneously, thereby can in liquified natural gas vaporizer, form the heat exchange atmosphere fast and efficiently, thereby farthest improve the heat-exchange performance of equipment.
2. directly do not contact owing to thermal medium with the liquified natural gas of low temperature, thereby can thoroughly solve thermal medium and form ice sheet at the LNG Liquefied natural gas low temperature area, thereby heat transmission resistance increases, and has increased the problem of heat transfer complexity, has greatly improved the Security and the reliability of equipment operation.
3. be used storage, conveying and the pumping that can realize middle heating agent with middle heating agent supply system and replenish, guaranteed the security of operation of system.
4. can realize regulating the thermal medium flow of inletting device with being used of thermal medium regulating system, liquified natural gas regulating system, to reach the purpose of device heat load adjustment according to the variation of LNG Liquefied natural gas flow.