CN213982975U

CN213982975U - Residual gas recycling device in LNG gas cylinder periodic inspection

Info

Publication number: CN213982975U
Application number: CN202022125171.0U
Authority: CN
Inventors: 张应龙; 武建文; 班涛; 丁翰栋; 缪严杉
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-08-17
Anticipated expiration: 2030-09-24

Abstract

The utility model discloses a residual gas is retrieved, cyclic utilization device among LNG gas cylinder periodic inspection. Including coil pipe, vaporizer, No. two vaporization pipes, vaporization pipe, stop valve 9, stop valve 10, stop valve 8, stop valve 7, stop valve 6, stop valve 2, stop valve 1, bottom liquid phase pipe, treat that LNG gas cylinder, top liquid phase pipe, gaseous phase pipe, stop valve 3, check valve, stop valve 5, stop valve 4, blow-down pipe, stop valve 11, relief valve, liquid nitrogen gas cylinder and LNG store the gas cylinder, LNG stores the gas cylinder and sets up in the liquid nitrogen gas cylinder, LNG stores the gas cylinder bottom in the coil pipe, coil pipe one end and LNG store the gas cylinder bottom and be connected, and with LNG store that the gas cylinder is inside to be linked together. The utility model discloses can retrieve the storage with detecting LNG gas cylinder exhaust sweep gas, can flow back to the LNG gas cylinder after detecting the completion again, solve the extravagant big, the polluted environment of exhaust before the LNG gas cylinder inspection, and the unable condition that removes of vehicle after the inspection.

Description

Residual gas recycling device in LNG gas cylinder periodic inspection

Technical Field

The utility model relates to a check out test set field specifically is a incomplete gas is retrieved, cyclic utilization device in LNG gas cylinder periodic inspection.

Background

The LNG cylinder is a special container for storing and transporting low-temperature liquid, and due to the special flammable and explosive filling medium, once leakage or explosion occurs, fire disasters are possibly caused, the development of national economy and the loss of lives and properties of people are caused, and therefore users have to regularly check the LNG cylinder according to requirements.

According to the current inspection standard GB/T34347-2017 periodic inspection and assessment of low-temperature heat-insulation gas cylinders, each gas cylinder needs to be tested for the static evaporation rate according to the requirements of GB/T18443.5 performance test method of vacuum heat-insulation cryogenic equipment. The cylinder should be left to stand for 48h after the end of the filling before the test, and the air release valve should be opened during the standing period, which is equivalent to exhausting the gas in the cylinder.

LNG is easy to burn, has low temperature and is dangerous when being discharged naturally, and discharging is accompanied with harsh noise through an emptying pipe; before inspection, the emptying and exhausting time is long, the loss amount is large, and the environment is polluted; after the inspection is finished, the pressure in the bottle is zero, the vehicle cannot run, and pressurization is needed, but the self-pressurization time is too long.

SUMMERY OF THE UTILITY MODEL

The technique that exists is not enough to the aforesaid, the utility model aims at providing a residual gas is retrieved, cyclic utilization device in LNG gas cylinder periodic inspection, and it can solve the condition that the LNG gas cylinder before the inspection exhaust is extravagant big, polluted environment and inspection back vehicle can't remove.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the residual gas recycling device in the periodic inspection of the LNG cylinder is characterized by comprising a coil pipe, a vaporizer, a second vaporization pipe, a first vaporization pipe, a 9 # stop valve, a 10 # stop valve, a 8 # stop valve, a 7 # stop valve, a 6 # stop valve, a 2 # stop valve, a 1 # stop valve, a bottom liquid phase pipe, an LNG cylinder to be inspected, a top liquid phase pipe, a gas phase pipe, a 3 # stop valve, a one-way valve, a 5 # stop valve, a 4 # stop valve, a vent pipe, a 11 # stop valve, a safety valve, a liquid nitrogen cylinder and an LNG storage cylinder, wherein the LNG storage cylinder is arranged in the liquid nitrogen cylinder, the coil pipe is arranged at the bottom of the LNG storage cylinder, one end of the coil pipe is connected with the bottom of the LNG storage cylinder and communicated with the inside of the LNG storage cylinder, the other end of the coil pipe extends out of the liquid nitrogen cylinder, and the LNG to be inspected is connected with the other end of the coil pipe, the coil pipe is provided with a No. 6 stop valve and is positioned outside the liquid nitrogen cylinder, one end of the bottom liquid phase pipe is arranged in the liquid nitrogen cylinder and is close to the bottom of the liquid nitrogen cylinder, the other end of the bottom liquid phase pipe is positioned outside the liquid nitrogen cylinder and is positioned below the other end of the coil pipe, the bottom liquid phase pipe is provided with a No. 2 stop valve and is positioned outside the liquid nitrogen cylinder, one end of the top liquid phase pipe is arranged in the liquid nitrogen cylinder and is positioned above the LNG storage cylinder, the other end of the top liquid phase pipe is positioned outside the liquid nitrogen cylinder, the top liquid phase pipe is provided with a No. 1 stop valve and is positioned outside the liquid nitrogen cylinder, one end of the gas phase pipe is divided into two parts, one part of the two parts is arranged in the liquid nitrogen cylinder, the other part is arranged in the LNG storage cylinder, the other end of the gas phase pipe is positioned outside the liquid nitrogen cylinder, the gas phase pipe is provided with a one-way valve and is close to the other end of the gas phase pipe, the vaporizer is characterized in that a No. 3 stop valve is arranged on the gas phase pipe and is positioned between the one-way valve and the other end of the gas phase pipe, a No. 4 stop valve is arranged on one strand of one end of the gas phase pipe, a No. 5 stop valve is arranged on the other strand of one end of the gas phase pipe, the No. 4 stop valve and the No. 5 stop valve are both positioned outside the liquid nitrogen cylinder, the vent pipe is positioned outside the liquid nitrogen cylinder, one end of the vent pipe is connected with one strand of one end of the gas phase pipe, the connection point is positioned between the No. 4 stop valve and the outer wall of the liquid nitrogen cylinder, a safety valve is arranged on the vent pipe, a No. 11 stop valve is arranged on the vent pipe and is positioned between the safety valve and the other end of the gas phase pipe, the vaporizer is arranged at the bottom of the liquid nitrogen cylinder, a first strand and a second strand of the vaporizer are connected on the vaporizer, one end of the first strand of the vaporizer is divided into two strands, one strand of one end of the first strand of the gas phase pipe is connected with the other strand of the gas phase pipe, the connection point is located between the No. 5 stop valve and the outer wall of the liquid nitrogen gas bottle, one strand of one end of the first vaporization pipe is provided with the No. 8 stop valve, the other strand of one end of the first vaporization pipe is connected with the LNG gas bottle to be tested, the other strand of one end of the first vaporization pipe is provided with the No. 7 stop valve, one end of the second vaporization pipe is divided into two strands, one strand of one end of the second vaporization pipe is connected with the bottom liquid phase pipe, the connection point is located between the No. 2 stop valve and the outer wall of the liquid nitrogen gas bottle, one strand of one end of the second vaporization pipe is provided with the No. 9 stop valve, the other strand of one end of the second vaporization pipe is connected with the coil pipe, the connection point is located between the No. 6 stop valve and the outer wall of the liquid nitrogen gas bottle, and the other strand of one end of the second vaporization pipe is provided with the No. 10 stop valve.

Preferably, the LNG storage cylinder is of a single-layer structure.

The beneficial effects of the utility model reside in that: can retrieve the storage with detecting LNG gas cylinder exhaust sweep gas, can flow back to the LNG gas cylinder after the detection is accomplished again, solve the extravagant big, the polluted environment of exhaust before the LNG gas cylinder inspection, and the unable condition that removes of vehicle after the inspection.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the residual gas recovery and recycling device in the periodic inspection of the LNG gas cylinder of the present invention;

description of reference numerals:

coil pipe 1, vaporizer 2, No. two vaporization pipes 3, vaporization pipe 4, No. 9 stop valve 5, No. 10 stop valve 6, No. 8 stop valve 7, No. 7 stop valve 8, No. 6 stop valve 9, No. 2 stop valve 10, No. 1 stop valve 11, bottom liquid phase pipe 12, treat LNG gas cylinder 13, top liquid phase pipe 14, gas phase pipe 15, No. 3 stop valve 16, check valve 17, No. 5 stop valve 18, No. 4 stop valve 19, blow-down pipe 20, No. 11 stop valve 21, relief valve 22, liquid nitrogen gas cylinder 23, LNG storage gas cylinder 24.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the residual gas recycling device in the periodic inspection of the LNG gas cylinder comprises a coil 1, a vaporizer 2, a second vaporization pipe 3, a first vaporization pipe 4, a 9 stop valve 5, a 10 stop valve 6, a 8 stop valve 7, a 7 stop valve 8, a 6 stop valve 9, a 2 stop valve 10, a 1 stop valve 11, a bottom liquid phase pipe 12, an LNG gas cylinder 13 to be inspected, a top liquid phase pipe 14, a gas phase pipe 15, a 3 stop valve 16, a check valve 17, a 5 stop valve 18, a 4 stop valve 19, an emptying pipe 20, a 11 stop valve 21, a safety valve 22, a liquid nitrogen gas cylinder 23 and an LNG storage gas cylinder 24, wherein the LNG storage gas cylinder 24 is arranged in the liquid nitrogen gas cylinder 23, the coil 1 is arranged at the bottom of the LNG storage gas cylinder 24, one end of the coil 1 is connected with the lower part of the LNG storage gas cylinder 24 and communicated with the inside of the LNG storage gas cylinder 24, and the other end of the coil 1 extends out of the liquid nitrogen gas cylinder 23, the LNG cylinder 13 to be tested is connected with the other end of the coil pipe 1, a No. 6 stop valve 9 is arranged on the coil pipe 1 and is positioned outside the liquid nitrogen cylinder 23, one end of a bottom liquid phase pipe 12 is arranged in the liquid nitrogen cylinder 23 and is close to the bottom of the liquid nitrogen cylinder 23, the other end of the bottom liquid phase pipe 12 is positioned outside the liquid nitrogen cylinder 23 and is positioned below the other end of the coil pipe 1, a No. 2 stop valve 10 is arranged on the bottom liquid phase pipe 12 and is positioned outside the liquid nitrogen cylinder 23, one end of a top liquid phase pipe 14 is arranged in the liquid nitrogen cylinder 23 and is positioned above the LNG storage cylinder 24, the other end of the top liquid phase pipe 14 is positioned outside the liquid nitrogen cylinder 23, a No. 1 stop valve 11 is arranged on the top liquid phase pipe 14 and is positioned outside the liquid nitrogen cylinder 23, one end of the gas phase pipe 15 is divided into two gas cylinders, one of which is arranged in the liquid nitrogen cylinder 23, and the other is arranged in the LNG storage cylinder 24, the other end of the gas phase pipe 15 is positioned outside a liquid nitrogen bottle 23, a check valve 17 is arranged on the gas phase pipe 15 and is close to the other end of the gas phase pipe 15, a stop valve 3 16 is arranged on the gas phase pipe 15 and is positioned between the check valve 17 and the other end of the gas phase pipe 15, a stop valve 4 is arranged on one strand of one end of the gas phase pipe 15, a stop valve 5 is arranged on the other strand of one end of the gas phase pipe 15, the stop valves 4, 5 19, 18 are both positioned outside the liquid nitrogen bottle 23, a vent pipe 20 is positioned outside the liquid nitrogen bottle 23, one end of the vent pipe 20 is connected with one strand of one end of the gas phase pipe 15, the connection point is positioned between the stop valve 4 19 and the outer wall of the liquid nitrogen bottle 23, a safety valve 22 is arranged on the vent pipe 20, a stop valve 11 is arranged on the vent pipe 20 and is positioned between the safety valve 22 and the other end of the gas phase pipe 15, the vaporizer 2 is arranged at the bottom of a liquid nitrogen cylinder 23, a first vaporizing pipe 4 and a second vaporizing pipe 3 are connected to the vaporizer 2, one end of the first vaporizing pipe 4 is divided into two strands, one strand of one end of the first vaporizing pipe 4 is connected with the other strand of one end of a gas phase pipe 15, a connection point is located between a No. 5 stop valve 18 and the outer wall of the liquid nitrogen cylinder 23, one strand of one end of the first vaporizing pipe 4 is provided with a No. 8 stop valve 7, the other strand of one end of the first vaporizing pipe 4 is connected with an LNG cylinder 13 to be detected, the other strand of one end of the first vaporizing pipe 4 is provided with a No. 7 stop valve 8, one end of the second vaporizing pipe 3 is divided into two strands, one strand of one end of the second vaporizing pipe 3 is connected with a bottom liquid phase pipe 12, the connection point is located between a No. 2 stop valve 10 and the outer wall of the liquid nitrogen cylinder 23, one strand of one end of the second vaporizing pipe 3 is provided with a No. 9 stop valve 5, the other strand of No. 3 one ends of vaporization pipes is connected with coil pipe 1, and the tie point is located between No. 6 stop valve 9 and liquid nitrogen gas bottle 23 outer wall, put No. 10 stop valve 6 on the other strand of No. 3 one ends of vaporization pipes.

Further, the LNG storage cylinder 24 has a single-layer structure.

Filling the liquid nitrogen gas bottle 23, namely simultaneously connecting a top liquid phase pipe 14, a bottom liquid phase pipe 12 and a gas phase pipe 15 of the liquid nitrogen gas bottle 23, opening a No. 1 stop valve 11, a No. 2 stop valve 10, a No. 3 stop valve 16 and a No. 4 stop valve 19, closing other valves, and filling the liquid nitrogen gas bottle 23 by using a pressure difference method, wherein the maximum filling rate of the liquid nitrogen gas bottle 23 is 90%;

opening a No. 3 stop valve 16 and a No. 5 stop valve 18 before checking, and completely discharging the pressure in an LNG storage cylinder 24; connecting an LNG gas cylinder 13 to be tested with an LNG storage gas cylinder 24, opening a No. 6 stop valve 9, closing other valves, liquefying the gas by a coil 1 immersed in liquid nitrogen, and then entering the LNG storage gas cylinder 24; since the LNG storage cylinder 24 and the coil 1 are immersed in liquid nitrogen, the LNG storage cylinder 24 is entirely liquid (LNG is entirely liquefied at-162 ℃); along with the prolonging of time, the gas in the LNG cylinder 13 to be tested can be completely converted into liquid to be stored in the LNG storage cylinder 24 in the liquid nitrogen cylinder 23; during the liquefaction of the LNG gas, the pressure inside the liquid nitrogen cylinder 23 will rise; after the LNG cylinder 13 to be inspected is inspected, the stop valves No. 4 and No. 5 19 and 18 are opened, other valves are closed, nitrogen enters the LNG storage cylinder 24, liquid in the LNG storage cylinder 24 flows out, the liquid is vaporized by the vaporizer 2 and then enters the inspected LNG cylinder, the pressure of the LNG cylinder is increased, and the vehicle can be started normally;

if the LNG gas cylinder of inspection is many, when 23 pressures of liquid nitrogen gas cylinder are not enough, can open No. 8 stop valves 7, No. 9 stop valves 5 and store 24 pressure boost to LNG earlier, then close No. 8 stop valves 7, No. 9 stop valves 5, open No. 10 stop valves 6, No. 7 stop valves 8, accomplish the gas cylinder to the inspection and continue the pressure boost to guarantee that the vehicle starts.

The utility model discloses a design can be with detecting LNG gas cylinder exhaust sweep gas recovery storage, can flow back to the LNG gas cylinder after detecting the completion again, solves the extravagant big, the polluted environment of exhaust before the LNG gas cylinder inspection, and the unable condition that removes of vehicle after the inspection.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

The residual gas recycling device in the periodic inspection of the LNG cylinder is characterized by comprising a coil pipe, a vaporizer, a second vaporization pipe, a first vaporization pipe, a 9 stop valve, a 10 stop valve, a 8 stop valve, a 7 stop valve, a 6 stop valve, a 2 stop valve, a 1 stop valve, a bottom liquid phase pipe, an LNG cylinder to be inspected, a top liquid phase pipe, a gas phase pipe, a 3 stop valve, a one-way valve, a 5 stop valve, a 4 stop valve, a vent pipe, a 11 stop valve, a safety valve, a liquid nitrogen cylinder and an LNG storage cylinder, wherein the LNG storage cylinder is arranged in the liquid nitrogen cylinder, the coil pipe is arranged at the bottom of the LNG storage cylinder, one end of the coil pipe is connected with the bottom of the LNG storage cylinder and communicated with the inside of the LNG storage cylinder, the other end of the coil pipe extends outwards to form the liquid nitrogen cylinder, the LNG cylinder to be inspected is connected with the other end of the coil pipe, and the 6 stop valve is arranged on the coil pipe, and is located outside the liquid nitrogen cylinder, one end of the bottom liquid phase pipe is arranged in the liquid nitrogen cylinder and close to the bottom of the liquid nitrogen cylinder, the other end of the bottom liquid phase pipe is located outside the liquid nitrogen cylinder and below the other end of the coil pipe, a stop valve No. 2 is arranged on the bottom liquid phase pipe and located outside the liquid nitrogen cylinder, one end of the top liquid phase pipe is arranged in the liquid nitrogen cylinder and above the LNG storage cylinder, the other end of the top liquid phase pipe is located outside the liquid nitrogen cylinder, a stop valve No. 1 is arranged on the top liquid phase pipe and located outside the liquid nitrogen cylinder, one end of the gas phase pipe is divided into two strands, one strand is arranged in the liquid nitrogen cylinder, the other strand is arranged in the LNG storage cylinder, the other end of the gas phase pipe is located outside the liquid nitrogen cylinder, a check valve is arranged on the gas phase pipe and close to the other end of the gas phase pipe, and a stop valve No. 3 is arranged on the gas phase pipe, the vaporizer is arranged at the bottom of the liquid nitrogen gas bottle, a first vaporizing pipe and a second vaporizing pipe are connected to the vaporizer, one end of the first vaporizing pipe is divided into two parts, one part is connected with the other part at one end of the gas phase pipe, the other part is connected with the other part at one end of the gas phase pipe, the 4 th stop valve and the 5 th stop valve are both arranged outside the liquid nitrogen gas bottle, the vent pipe is arranged outside the liquid nitrogen gas bottle, one end of the vent pipe is connected with one part at one end of the gas phase pipe, the connecting point is arranged between the 4 th stop valve and the outer wall of the liquid nitrogen gas bottle, the vent pipe is provided with a safety valve, the vent pipe is provided with a 11 th stop valve and is arranged between the safety valve and the other end of the gas phase pipe, the vaporizer is arranged at the bottom of the liquid nitrogen gas bottle, the first vaporizing pipe and the second vaporizing pipe are, the connection point is located between the No. 5 stop valve and the outer wall of the liquid nitrogen gas bottle, one strand of one end of the first vaporization pipe is provided with the No. 8 stop valve, the other strand of one end of the first vaporization pipe is connected with the LNG gas bottle to be tested, the other strand of one end of the first vaporization pipe is provided with the No. 7 stop valve, one end of the second vaporization pipe is divided into two strands, one strand of one end of the second vaporization pipe is connected with the bottom liquid phase pipe, the connection point is located between the No. 2 stop valve and the outer wall of the liquid nitrogen gas bottle, one strand of one end of the second vaporization pipe is provided with the No. 9 stop valve, the other strand of one end of the second vaporization pipe is connected with the coil pipe, the connection point is located between the No. 6 stop valve and the outer wall of the liquid nitrogen gas bottle.
2. The residual gas recovery and recycling device for the periodic inspection of the LNG cylinder as claimed in claim 1, wherein the LNG storage cylinder has a single-layer structure.