CN215764596U

CN215764596U - Domestic gas pipeline system in LNG peak regulation reserve station

Info

Publication number: CN215764596U
Application number: CN202122045716.1U
Authority: CN
Inventors: 唐殿扣; 赵斌; 侯元元; 魏岩; 李丰; 彭熙永; 刘洪涛; 张旭军; 张长智; 陈鹏; 姚丹龙; 刘经平; 惠亮; 刘维超; 张军; 李国军
Original assignee: Tongchuan Natural Gas Co ltd; East China Engineering Science and Technology Co Ltd
Current assignee: Tongchuan Natural Gas Co ltd; East China Engineering Science and Technology Co Ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-02-08
Anticipated expiration: 2031-08-27

Abstract

The utility model relates to the technical field of LNG peak-shaving reserve station construction, in particular to a domestic gas pipeline system in an LNG peak-shaving reserve station. The LNG gasification process pipeline is communicated with an inner pump of an LNG storage tank at the upstream, is communicated with an outer delivery pipe network at the downstream, is communicated with the LNG storage tank at the upstream and is communicated with a slow outer delivery pipe network at the downstream; when the transmission of the NG outer pipe network is suddenly interrupted due to special conditions, LNG gasification flow pipelines, backflow pipelines and NG domestic gas supply pipelines or BOG evaporation flow pipelines in the station can be fully utilized, LNG gasified NG or low-temperature BOG in the storage tank is evaporated, and is transmitted to the domestic gas supply pipe network to supply domestic gas in the station; meanwhile, the problem that BOG is pressurized and restored to the storage tank is solved, BOG gas and NG produced in the station are fully utilized, the operation cost in the station is reduced, and the BOG storage tank has good economy.

Description

Domestic gas pipeline system in LNG peak regulation reserve station

Technical Field

The utility model relates to the technical field of LNG peak-shaving reserve station construction, in particular to a domestic gas pipeline system in an LNG peak-shaving reserve station.

Background

Natural Gas (NG) is used as an environment-friendly and efficient energy source, is widely applied to production and life of people, and generally increases the construction of LNG peak regulation reserve stations. The domestic gas in the peak regulation storage station is mainly used for daily life aspects of heating, showering, cooking and the like of staff, and under normal conditions, the domestic gas mainly comes from the conveying supply of the NG outer pipe network, but if the conveying of the NG outer pipe network is suddenly interrupted due to special conditions, the normal operation in the station can be influenced.

Meanwhile, the storage tank in the peak-shaving storage station absorbs heat, the LNG in the storage tank evaporates to generate BOG gas, the BOG is a derivative of the LNG, and due to the existence and the emission of the BOG, the large economic loss is generated for enterprises, the emission of the BOG is also a pollution to the atmosphere, and the BOG is also a dangerous source for the storage station.

SUMMERY OF THE UTILITY MODEL

The utility model does not solve the problem of domestic gas in a peak shaving reserve station, provides a domestic gas pipeline system in an LNG peak shaving reserve station, solves the domestic gas in the station by utilizing an LNG gasification or BOG evaporation process, and has the following specific technical scheme:

a domestic gas pipeline system in an LNG peak regulation reserve station comprises an in-tank pump of an LNG storage tank 11 communicated with the upstream of an LNG gasification process pipeline 1, an external delivery pipe network communicated with the downstream of the LNG gasification process pipeline 1, and an LNG air-temperature vaporizer 12, an LNG water-bath vaporizer 13 and an NG pressure regulation metering odorizing pry 14 which are sequentially arranged from the upstream to the downstream of the LNG gasification process pipeline 1;

the LNG gasification process pipeline 1 is also respectively communicated with a return pipeline 2 and an NG domestic gas supply pipeline 3, the upstream of the return pipeline 2 is communicated with an inlet of a first flow regulating valve 18, the downstream of the return pipeline 2 is communicated with an LNG storage tank 11, the upstream of the NG domestic gas supply pipeline 3 is communicated with an outlet of an LNG water bath type gasifier 13, and the downstream of the NG domestic gas supply pipeline 3 is communicated with a buffer tank 44 and goes to the direction of domestic gas in the station;

the method is characterized in that: still include BOG evaporation process pipeline 4, the LNG storage tank 11 is put through to the upper reaches of BOG evaporation process pipeline 4, and the outer defeated pipe network is put through to the lower reaches of BOG evaporation process pipeline 4, and is equipped with BOG air temperature formula vaporizer 41, BOG water bath electric heat recuperator 42, BOG compressor 43, buffer tank 44 and BOG pressure regulating measurement and adds the smelly sled 45 from the upper reaches of BOG evaporation process pipeline 4 to lower reaches in proper order.

Further, a pressure gauge I15, a flow meter 16, a temperature gauge I17 and a flow regulating valve I18 are sequentially arranged on the LNG gasification process pipeline 1 corresponding to the outlet of the pump in the tank, and a temperature gauge II 19 and a pressure gauge II 20 are arranged at the outlet of the LNG water bath type gasifier 13.

Further, a second flow regulating valve 21 is arranged on the return pipeline 2.

Further, a manual valve 31 is provided on the NG gas supply pipeline 3.

Further, a first pneumatic cut-off valve 46 is sequentially arranged at the inlet of the BOG air-temperature type gasifier 41 on the BOG evaporation process pipeline 4, and a third thermometer 47 and a third pressure gauge 48 are arranged at the outlet of the BOG water-bath electric-heating reheater 42.

Further, the device also comprises a domestic gas pipeline 5, wherein the upstream is communicated with the outlet of the buffer tank 44, the downstream is communicated with domestic gas in the station, and a pneumatic stop valve II 51 and a flow meter II 52 are arranged on the domestic gas pipeline 5.

The utility model has the following beneficial technical effects:

the domestic gas pipeline system in the LNG peak regulation reserve station comprises an LNG gasification process pipeline, a backflow pipeline, a domestic gas pipeline and a BOG evaporation process pipeline, when the transmission of an NG outer pipe network is suddenly interrupted due to special conditions, the evaporation process pipeline of the BOG in the station can be fully utilized, low-temperature BOG steam in a storage tank enters a BOG compressor for compression after being gasified and heated by a BOG air-temperature gasifier, is further heated and enters a buffer tank, and domestic gas in the supply station is input to a domestic gas supply pipe network; meanwhile, the problem that the BOG is pressurized and restored to the storage tank is solved, the BOG gas is fully utilized, the operation cost in the station is reduced, and the BOG storage tank has good economy.

Drawings

Fig. 1 is a schematic system structure diagram of a domestic gas pipeline system according to the present invention.

Wherein: the LNG gasification process line 1, the LNG storage tank 11, the LNG air-temperature type gasifier 12, the LNG water bath type gasifier 13, the NG pressure-regulating metering odorizing pry 14, the pressure gauge 15, the flowmeter 16, the thermometer 17, the flowmeter 18, the thermometer 19, the thermometer 20, the flowmeter 20, the reflux line 2, the flowmeter 21, the flowmeter 3, the gas supply pipeline for daily use 31, the manual valve 4, the BOG evaporation process line 4, the BOG air-temperature type gasifier 41, the BOG water-bath electric heating reheater 42, the BOG compressor 43, the buffer tank 44, the BOG pressure-regulating metering odorizing pry 45, the pneumatic shutoff valve 46, the pneumatic shutoff valve 47, the thermometer III, the pressure gauge 48, the pressure gauge III, the gas supply pipeline for daily use 5, the pneumatic shutoff valve 51, the pneumatic shutoff valve II 52 and the flowmeter II.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

Examples

Referring to fig. 1, a domestic gas pipeline system in an LNG peak shaving storage station includes an in-tank pump connected with an LNG storage tank 11 at the upstream of an LNG gasification process pipeline 1, an external delivery pipe network connected at the downstream of the LNG gasification process pipeline 1, and an LNG air-temperature vaporizer 12, an LNG water-bath vaporizer 13 and an NG pressure-regulating metering odorizing pry 14 sequentially arranged from the upstream to the downstream of the LNG gasification process pipeline 1;

And a second flow regulating valve 21 is arranged on the return pipeline 2.

The NG domestic gas supply pipeline 3 is provided with a manual valve 31.

The BOG evaporation process pipeline 4 is also sequentially provided with a first pneumatic stop valve 46 at the inlet position of the BOG air-temperature type gasifier 41, and a third thermometer 47 and a third pressure gauge 48 at the outlet of the BOG water-bath electric-heating reheater 42.

The device also comprises a domestic gas pipeline 5, wherein the upstream is communicated with the outlet of the buffer tank 44, the downstream is communicated with domestic gas in the station, and a pneumatic stop valve II 51 and a flow meter II 52 are arranged on the domestic gas pipeline 5.

The pipeline system of the utility model is specifically implemented by using BOG evaporation and LNG gasification processes for domestic gas in the station as follows:

(1) boil off gas supply for life:

starting a first pneumatic stop valve 46 on a BOG evaporation flow pipeline 4, starting a BOG air-temperature type gasifier 41, a BOG water bath electric heating reheater 42, a BOG compressor 43, a buffer tank 44 and a second pneumatic stop valve 51 on a domestic gas pipeline 5, wherein BOG steam at-150 ℃ in an LNG storage tank 11 is gasified by the BOG air-temperature type gasifier 41 and heated to-10 ℃, is heated to 5 ℃ by the BOG water bath electric heating reheater 42, enters the BOG compressor 42 for compression, enters the buffer tank 43 when the temperature reaches 40 ℃, and is conveyed to the domestic gas in the station.

(2) LNG gasification for domestic gas supply:

starting an in-tank pump and a flow regulating valve I18 on an LNG gasification flow pipeline 1, an LNG air-temperature type gasifier 12, an LNG water bath type gasifier 13, a manual valve 31 and a buffer tank 44 on a domestic gas pipeline 3 and a pneumatic cut-off valve II 51 on a domestic gas pipeline 5, feeding LNG at-162 ℃ in an LNG storage tank 11 into the LNG air-temperature type gasifier 12 for gasification under the action of the in-tank pump, raising the temperature to-30 ℃, feeding the LNG into the LNG water bath type gasifier 13 for heating, and feeding the LNG at the temperature of 5 ℃ into the buffer tank 44 to be conveyed to the domestic gas in the station.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A domestic gas pipeline system in an LNG peak regulation reserve station comprises an in-tank pump of an LNG storage tank (11) communicated with the upstream of an LNG gasification process pipeline (1), an external delivery pipe network communicated with the downstream of the LNG gasification process pipeline (1), and an LNG air temperature type gasifier (12), an LNG water bath type gasifier (13) and an NG pressure regulation metering odorizing pry (14) which are sequentially arranged from the upstream to the downstream of the LNG gasification process pipeline (1);

the LNG gasification process pipeline (1) is also respectively communicated with a return pipeline (2) and an NG domestic gas supply pipeline (3), the upstream of the return pipeline (2) is communicated with an inlet of a flow regulating valve I (18), the downstream of the return pipeline (2) is communicated with an LNG storage tank (11), the upstream of the NG domestic gas supply pipeline (3) is communicated with an outlet of an LNG water bath type gasifier (13), and the downstream of the NG domestic gas supply pipeline (3) is communicated with a buffer tank (44) and goes to the direction of domestic gas in the station;

the method is characterized in that: still include BOG evaporation process pipeline (4), LNG storage tank (11) is put through to the upper reaches of BOG evaporation process pipeline (4), defeated pipe network outward is put through to the low reaches of BOG evaporation process pipeline (4), and sets gradually from the upper reaches to the low reaches of BOG evaporation process pipeline (4) and be equipped with BOG air-temperature formula vaporizer (41), BOG water bath electric heat reheater (42), BOG compressor (43), buffer tank (44) and BOG pressure regulating measurement and add smelly sled (45).

2. The system of claim 1, wherein: the LNG gasification process pipeline (1) is further provided with a first pressure gauge (15), a first flowmeter (16), a first thermometer (17) and a first flow regulating valve (18) in sequence corresponding to the outlet of the pump in the tank, and the outlet of the LNG water bath type gasifier (13) is provided with a second thermometer (19) and a second pressure gauge (20).

3. The system of claim 1, wherein: and a flow regulating valve II (21) is arranged on the return pipeline (2).

4. The system of claim 1, wherein: and a manual valve (31) is arranged on the NG gas supply pipeline (3).

5. The system of claim 1, wherein: the BOG evaporation process pipeline (4) is provided with a first pneumatic stop valve (46) at the inlet position of the BOG air-temperature type gasifier (41), and a third thermometer (47) and a third pressure gauge (48) at the outlet of the BOG water-bath electric-heating reheater (42).

6. The system of claim 1, wherein: the device also comprises a domestic gas pipeline (5), wherein the upstream is communicated with the outlet of the buffer tank (44), the downstream is communicated with domestic gas in the station, and a pneumatic stop valve II (51) and a flow meter II (52) are arranged on the domestic gas pipeline (5).