CN201391742Y - Energy-saving slid-mounted liquefied natural gas filling device - Google Patents

Abstract

The utility model discloses an energy-saving slid-mounted liquefied natural gas filling device, which comprises a storage tank (1), a transmission pipeline (6), an LNG cryopump (2) and a control system (5). The device is characterized in that a liquid filling tank (3) is arranged at the outlet of the LNG cryopump (2) on the transmission pipeline (6); the inlet of the liquid filling tank is arranged above the liquid filling tank; the outlet of the liquid filling tank is connected with an air dispenser (4); and a regulating device for regulating the temperature and the pressure of the liquefied natural gas in the tank is arranged on the liquid filling tank. Based on the prior fixed gas station, the liquid filling tank is additionally mounted, so that the installation is simple and convenient, the liquid filling tank is used for filling gas for terminal users, the emptying is avoided effectively, the working condition of the LNG cryopump is improved, the starting frequency of the LNG cryopump is reduced, and the energy consumption is reduced.

Description

Energy-saving type LNG Liquefied natural gas skid liquid-adding device

Technical field

The utility model relates to the LNG Liquefied natural gas liquid-adding device, is specifically related to a kind of energy-saving type LNG Liquefied natural gas skid liquid-adding device.

Background technique

At present the liquid feeding of LNG Liquefied natural gas mainly be utilize fixedly gas station to LNG Liquefied natural gas unload, pressure regulation, release and aerating process, its work system comprises storage tank, conveyance conduit, LNG cryopump and control system etc.In the process of unloading, the unloading way that adopts mainly is to utilize pressurized machine and pump to unite to unload at present, energy consumption is big, owing to transport of the reduction of the tank car pressurized machine of LNG along with liquid level, it is more and more lower from pressurized effect, can't satisfy the clean positive pressure head of LNG cryopump, cause pump efficiency more and more lower, produce cavitation erosion when serious; Because the vehicle-mounted bottle itself on the automobile is not with pressurized machine, therefore the LNG Liquefied natural gas in the vehicle-mounted bottle must be the saturated liquids that enough supply gas pressures are arranged, before giving refueling, to carry out the pressure regulation temperature adjustment to the LNG Liquefied natural gas in the storage tank, can give refueling after making it to become saturated liquids, at present the supercharging mode that adopts is that pressure of storage tank regulator and the circulation of pump low speed are united to use and carried out the pressure regulation temperature adjustment, the cost of investment height, energy consumption is big; In giving the process of storage tank pressure regulation, the liquid in the storage tank in constantly evaporation and gasification, makes the pressure of storage tank increasing simultaneously, is the safety that guarantees storage tank, in limited time, also needs to carry out emptying to handle near high workload power, and LNG Liquefied natural gas is caused waste; In the aerating process, before giving the aerating of user's vehicle-mounted bottle, in bottle, have part residual air, because the pressure in the storage tank is higher, residual air in the bottle need be carried out emptying handles, could give refueling by pump pressurization back with the saturated LNG Liquefied natural gas in the storage tank, and the emptying of residual air causes waste to LNG Liquefied natural gas in the bottle.Also need to start the LNG cryopump in the liquid feeding process of LNG Liquefied natural gas regularly, make that the work of LNG cryopump is frequent, load is heavier, energy consumption is big, and to the pressure and temperature requirement in the storage tank, make that the operating mode of pump is comparatively complicated, the probability that cavitation erosion occurs becomes greatly.

The model utility content

The purpose of this utility model is to provide a kind of energy-saving type LNG Liquefied natural gas skid liquid-adding device at the deficiencies in the prior art, it is to install LNG Liquefied natural gas additional to add flow container on the conveyance conduit of the existing fixedly work system of gas station, avoid emptying effectively, improve the operating mode of LNG cryopump, reduce the startup frequency of LNG cryopump, reduce energy consumption.

The technological scheme that the utility model adopted is:

A kind of energy-saving type LNG Liquefied natural gas skid liquid-adding device, comprise storage tank, conveyance conduit, LNG cryopump and control system, storage tank is used to store LNG Liquefied natural gas, conveyance conduit possesses the fixedly input of unloading of the LNG Liquefied natural gas of gas station, the aerating output function, the LNG cryopump can be unloaded to LNG Liquefied natural gas, liquid feeding, the effect of fluid infusion, control system is to storage tank, the LNG cryopump, the alarm and the flow process of unloading, the liquid feeding flow process, the operating mode of fluid infusion flow process etc. is controlled, coordinate each several part and flow process, feature is: the outlet port in the LNG cryopump on conveyance conduit is provided with the flow container that adds with temperature-adjustment pressure-adjustment function, the inlet that adds flow container is arranged on the top that adds flow container and is connected with the outlet port of LNG cryopump, can add in the flow container spraying enter after the pressurization of the natural gas via LNG cryopump in the storage tank by the LNG cryopump, the outlet that adds flow container is connected with filling machine, the regulating equipment of LNG Liquefied natural gas temperature and pressure in the can regulate jar is set on adding flow container, make the pressure of the LNG Liquefied natural gas in the liquid feeding process, the adjustment of temperature is placed on to add in the flow container to be carried out, do not have relatedly with the LNG cryopump, do not influence the operating mode of pump.

The LNG Liquefied natural gas that transportation comes is by unloading mouthful with after conveyance conduit is connected, under LNG cryopump or the effect of tank car pressurized machine, LNG Liquefied natural gas is discharged in the storage tank, after being discharged into, do not need pressure regulation in the storage tank, thereby make LNG Liquefied natural gas that bigger pressure store temperature space be arranged, in the certain hour scope, accomplish not emptying; In operating process, the natural gas in low temperature steam of the elevated pressures that forms in the storage tank can be in the process of next time unloading by cold excessively LNG Liquefied natural gas condensation and step-down, thereby realize zero emptying.

When needing to give the user vehicle aerating, add in the flow container owing to by the LNG cryopump pressurization of the natural gas via LNG cryopump in storage tank back is sprayed to enter in advance, make to add and have the LNG Liquefied natural gas that certain saturation pressure and saturation temperature are arranged in the flow container, the elevated pressures that dependence adds in the flow container can be given user's aerating through filling machine, if when in user's container the gas phase of elevated pressures being arranged, can import in the storage tank by filling machine; When the liquid level that adds flow container is not enough, can spray into from top to bottom by the LNG cryopump LNG Liquefied natural gas that the low pressure in the storage tank is cold excessively and add in the flow container, through heat exchange, the a part of gas phase that adds in the flow container is condensed into liquid again, the LNG Liquefied natural gas heat absorption that comes from storage tank simultaneously heats up, then carry out temperature-adjustment pressure-adjustment according to user situation, directly give user's aerating by filling machine from adding in the flow container then with LNG Liquefied natural gas, thereby avoid directly gas being added to the user in storage tank in the aerating process, do not need the LNG Liquefied natural gas in the storage tank is carried out temperature-adjustment pressure-adjustment, avoid the frequent starting of LNG cryopump.

The utility model is to install flow container on the basis of original fixedly gas station additional, and simple installation is that the terminal use carries out aerating to add flow container, avoids emptying effectively, improves the operating mode of LNG cryopump, reduces the startup frequency of LNG cryopump, cuts down the consumption of energy.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1, storage tank; 2, LNG cryopump; 3, add flow container; 4, filling machine; 5, control system; 6, conveyance conduit.

Embodiment

In the structure shown in the figure, a kind of energy-saving type LNG Liquefied natural gas of the utility model skid liquid-adding device, comprise storage tank 1, conveyance conduit 6, LNG cryopump 2 and control system 5, feature is: on conveyance conduit 6, be provided with in the outlet port of LNG cryopump 2 have a temperature-adjustment pressure-adjustment function add flow container 3, the inlet that adds flow container is arranged on the top that adds flow container and is connected with the outlet port of LNG cryopump 2, the outlet that adds flow container is connected with filling machine 4, the regulating equipment of LNG Liquefied natural gas temperature and pressure in the can regulate jar is set on adding flow container, make the pressure of the LNG Liquefied natural gas in the liquid feeding process, the adjustment of temperature is placed on to add in the flow container to be carried out, do not have relatedly with the LNG cryopump, do not influence the operating mode of pump.

Carry out heat exchange in the flow container 3 in order to make storage tank 1 interior natural gas via LNG cryopump 2 pressurization backs spray to enter to add better, spraying tube is set in the ingress that adds flow container 3.

Claims (2)

1, a kind of energy-saving type LNG Liquefied natural gas skid liquid-adding device, comprise storage tank (1), conveyance conduit (6), LNG cryopump (2) and control system (5), it is characterized in that: upward add flow container (3) in the setting of the outlet port of LNG cryopump (2) at conveyance conduit (6), the inlet that adds flow container is arranged on the top that adds flow container and is connected with the outlet port of LNG cryopump (2), the outlet that adds flow container is connected with filling machine (4), and the regulating equipment of LNG Liquefied natural gas temperature and pressure in the can regulate jar is set on adding flow container.

2, energy-saving type LNG Liquefied natural gas skid liquid-adding device according to claim 1 is characterized in that: in the ingress that adds flow container (3) spraying tube is set.