CN216079300U - LNG emergency gasification device with adjustable heat value - Google Patents
LNG emergency gasification device with adjustable heat value Download PDFInfo
- Publication number
- CN216079300U CN216079300U CN202122730583.1U CN202122730583U CN216079300U CN 216079300 U CN216079300 U CN 216079300U CN 202122730583 U CN202122730583 U CN 202122730583U CN 216079300 U CN216079300 U CN 216079300U
- Authority
- CN
- China
- Prior art keywords
- gasifier
- lng
- pipeline
- valve
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The utility model relates to an LNG emergency gasification device with an adjustable heat value, which comprises an LNG gasification system, a pressure regulating and metering system and a heat value balancing system.
Description
Technical Field
The utility model provides an LNG emergency gasification device which can realize LNG emergency gasification, can stabilize a heat value according to user requirements, and meets the requirements of users on natural gas combustion conditions.
Background
With the adjustment of urban energy structures in China and the rapid development of the natural gas industry, natural gas has become the first choice gas source for urban gas pipeline supply, more and more cities realize pipeline natural gas supply, and the industrial and civil fields are rapidly developed. In the natural gas supply process, the emergency maintenance operation of the natural gas pipeline can be frequently touched, the LNG emergency gas supply device is adopted to carry out regional emergency gas supply, the gas stop accidents in the operation process can be effectively reduced or even eliminated, the safety risk caused by gas supply recovery is avoided, and the safe and continuous gas supply for users is ensured.
Meanwhile, with the rapid development of industrial technology intellectualization, customers have raised higher requirements for convenience in use and management of equipment and rapidness in operation and maintenance, and the security is more and more regarded by people as a serious topic in the energy industry. The equipment intellectualization is enhanced, the equipment safety is improved, and the equipment operation and maintenance cost is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides an LNG emergency gasification device with an adjustable heat value, which can be applied to an LNG tank car direct supply mode or an LNG storage tank liquid supply mode and is applied to maintenance or short-term use of a peak shaving station and a natural gas station.
The LNG emergency gasification device with the adjustable heat value comprises an LNG gasification system, a pressure regulating and metering system and a heat value balancing system, wherein:
the LNG gasification system comprises a combustor, a gasifier and a condenser which are connected in sequence, wherein an LNG liquid inlet pipeline is connected with an LNG inlet of the gasifier, preferably comprises a first LNG liquid inlet pipeline and a second LNG liquid inlet pipeline which are converged into a total LNG liquid inlet pipeline connected with the LNG inlet of the gasifier, an NG gas outlet pipeline of the gasifier is connected with a downstream gas utilization pipeline,
the outlet of the burner is connected with the heating medium inlet of the gasifier, the heating medium outlet of the gasifier is connected with the condenser through a pipeline, the gas outlet of the condenser is connected with the flue gas diffusion pipeline,
wherein, a branch pipe is branched from an NG gas outlet pipeline of the gasifier and is connected with an inlet of the combustor,
the pressure-regulating metering system comprises a first cut-off valve arranged on an LNG liquid inlet pipeline, a second cut-off valve arranged on an NG outlet pipeline of the gasifier, a first pressure regulating valve, a first flowmeter, a second pressure regulating valve and a third cut-off valve arranged on one branch pipe (natural gas inlet combustor pipeline) branched from the NG gas outlet pipeline of the gasifier;
the heat value balance system comprises an air compression device connected with an NG gas outlet pipeline of the gasifier through an air pipeline and a heat value instrument arranged on the NG gas outlet pipeline at the downstream of the connection part, a buffer tank, a second flow meter and a flow regulating valve are sequentially arranged on the air pipeline, the outlet of the air compression device is connected with the inlet of the buffer tank, the outlet of the buffer tank is connected with the NG gas outlet pipeline through the second flow meter, the flow regulating valve and a fourth automatic cut-off valve, the downstream of the NG gas outlet pipeline at the connection part of the buffer tank and the NG gas outlet pipeline is provided with the heat value instrument, the heat value instrument is controlled with the flow regulating valve and/or the fourth automatic cut-off valve in an interlocking mode, the gas mixing proportion can be adjusted in real time, and when the volume percentage content of natural gas is close to or equal to 2 times of the upper explosion limit, the air source is automatically alarmed and cut off. The mixing amount of the air is strictly controlled, and the volume percentage of the natural gas is ensured to be higher than 2 times of the explosion limit of the natural gas.
An air relief pipeline and a third safety valve can be further arranged on the air pipeline, a third pressure regulating valve is arranged on the air relief pipeline, and when the line pressure of the air pipeline exceeds 4.4Barg, the third safety valve jumps to protect the system from overpressure.
The gasifier is preferably an immersion combustion type gasifier, the burner, the heat exchange tube and the shell are integrally designed, and fuel gas is taken from a gasified gas source without an external gas source.
The air compressing device may further comprise a drying device for drying the air, for example a dryer connected after the air compressor.
Further, a safety relief pipeline is connected to an NG gas outlet pipeline of the gasifier, and a first safety valve and a flame arrester are sequentially arranged on the safety relief pipeline.
Further, the gasifier includes a circulating water line having one end connected to the bottom of the gasifier and one end connected to the top of the gasifier. When the device operates, two outlets are adopted at the bottom of the gasifier QHQ to discharge water simultaneously, and the circulating pump is utilized to rapidly circulate the heat exchange water in the gasifier, so that the heat exchange efficiency is improved.
Further, the gasifier comprises a gasifier drain line, one end of the gasifier drain line is connected with the bottom of the gasifier, and the other end of the gasifier drain line is connected with the sewage disposal pool. The pipeline is mainly used for discharging heat exchange water in the gasifier when the device is not used for a long time.
Further, a liquid level meter for detecting the liquid level inside the gasifier, a gasifier temperature meter for detecting the temperature inside the gasifier, and a gasifier pressure gauge (second pressure gauge) for detecting the pressure inside the gasifier are arranged in the gasifier. A branch pipe (natural gas inlet burner pipe) from an NG gas outlet pipe of the gasifier is provided with a first pressure gauge for detecting the internal pressure of the branch pipe. When the liquid level of the gasifier is less than or equal to 85 percent of the height of QHQ, or the pressure of a branch pipe branched from an NG gas outlet pipeline of the gasifier is more than or equal to 15kPa, or the internal pressure of the gasifier is more than or equal to 20kPa, or the internal temperature of the gasifier is more than or equal to 75 ℃, the third stop valve automatically cuts off and gives an alarm.
Further, the LNG emergency gasification device further comprises a fuel gas leakage alarm.
Further, a third pressure gauge and a second thermometer are arranged on an NG gas outlet pipeline of the gasifier, and if the temperature of the gasifier outlet pipeline is less than or equal to-10 ℃ or the pressure is greater than or equal to 4Barg or the gas leakage alarm device gives a gas leakage alarm, the first automatic cut-off valve gives an alarm and automatically cuts off the alarm.
Furthermore, first hand-operated valve and second hand-operated valve can be equipped with respectively on first LNG feed liquor pipeline and the second LNG feed liquor pipeline. The LNG tank wagon or the LNG storage tank goes out the liquid pipeline can be connected to the one end of first LNG feed liquor pipeline and second LNG feed liquor pipeline, and the LNG import of vaporizer is connected to the other end (after converging).
Further, a second safety valve is arranged on the gasifier shell to protect the gasifier. When the tube side of the gasifier is broken, LNG and NG leak to the shell side to cause the shell side pressure P2 to be more than or equal to 8Barg, the LNG and NG are diffused through a second safety valve.
The utility model further provides an LNG emergency gasification method with an adjustable heat value, which comprises the following steps:
1) LNG liquid inlet step: LNG is supplied to the gasifier through an LNG liquid inlet pipeline, two LNG liquid inlet pipelines, namely a first LNG liquid inlet pipeline and a second LNG liquid inlet pipeline are preferably selected for ensuring continuous liquid supply of the LNG, and the two pipelines can be switched to be used through a first manual valve and a second manual valve, so that liquid break is avoided;
2) LNG gasification step: when the device is started, a valve on an LNG liquid inlet pipeline is opened at a small flow rate, such as a first manual valve or a second manual valve, so that the LNG at a small flow rate (such as 1-10% or 2-5% of the total flow rate, and further about 3%) slowly enters a gasifier through a liquid inlet pipeline, is gasified through heat exchange with water, enters a second pressure regulating valve of a combustor pipeline through natural gas, is regulated to 6-12kPa, further 8-11kPa, such as about 10kPa, and enters a combustor for combustion. The process is to provide a fuel gas source to the burner prior to full flow gasification. When the water temperature of the gasifier reaches above 55 ℃, preferably above 58 ℃ and preferably above 60 ℃, a valve on an LNG liquid inlet pipeline is completely opened to start full-flow liquid inlet gasification, and at the moment, a second automatic cut-off valve on an NG gas outlet pipeline is automatically opened to start an LNG full-flow gasification process;
3) natural gas pressure regulating step: after LNG gasification begins, a first pressure regulating valve on an NG gas outlet pipeline automatically detects the pressure behind the first pressure regulating valve, regulates the pressure to 2-5 Barg, preferably 3-4 Barg, and enters a downstream gas pipe network;
4) fuel gas gasification pressure regulating step: after the LNG is gasified by the gasifier, taking gas from an NG gas outlet pipeline, wherein the gas amount is about 1-10% or 2-5%, preferably about 3% of the total gas amount in the NG gas outlet pipeline, adjusting the pressure to 6-12kPa, further 8-11kPa, for example about 10kPa, and then entering a combustor for combustion;
5) a heat value stabilizing step: after air is compressed by an air compression device and optionally dried, the pressure reaches 2-6 Barg, preferably 3-5 Barg, for example 4Barg, the air is metered by a first flow meter (preferably a turbine flow meter) and a second flow meter (preferably an orifice plate flow meter) through a buffer tank, and the flow ratio F2/F1 of the second flow meter to the first flow meter is less than or equal to 3 percent (volume), for example 1-3 percent, so that the opening of a flow regulating valve is regulated, and the air enters an LNG gasifier and then enters a pipeline to regulate the heat value of natural gas.
In the step 1), if the temperature of an NG gas outlet pipeline (gasifier outlet pipeline) is less than or equal to minus 10 ℃ or the pressure is more than or equal to 4Barg, or a gas leakage alarm gives a gas leakage alarm, a first automatic cut-off valve gives an alarm and automatically cuts off the alarm.
In the step 2), when gasifying, if the temperature of the NG gas outlet pipeline (gasifier outlet pipeline) is less than or equal to 0 ℃ or the pressure is less than or equal to 1Barg, or a gas leakage alarm gives a gas leakage alarm, the first automatic cut-off valve gives an alarm and automatically cuts off the gas leakage alarm.
In the step 3), if the temperature T2 of the outlet pipeline of the gasifier is less than or equal to minus 10 ℃ or the pressure P3 is more than or equal to 4Barg, or a gas leakage alarm occurs, the second automatic cut-off valve gives an alarm and automatically cuts off.
In the step 4), when the liquid level LT001 of the gasifier is less than or equal to 85% of the height of the gasifier, or the pressure of a fuel gas pipeline (a pipeline for natural gas to enter the combustor) is more than or equal to 15kpa, or the pressure of the gasifier is more than or equal to 20kpa, or the temperature of the gasifier is more than or equal to 75 ℃, the third automatic cut-off valve automatically cuts off and gives an alarm.
In the step 5), when the pressure of the air pipeline exceeds 4.4Barg, the third safety valve jumps to protect the system from overpressure, and the function is mainly suitable for places where stable heat value is needed for gas utilization of factory enterprises.
In the step 5), the specific adjusting proportion of the metering ratio F2/F1 of the second flow meter (orifice plate flow meter) and the first flow meter (turbine flow meter) is adjusted according to the quality requirement of the fuel gas and the quality requirement of the gas used by a user, and when the proportion of the metering ratio F2/F1 of the second flow meter (orifice plate flow meter) and the first flow meter (turbine flow meter) exceeds a set value or a heat value meter exceeds a set value, the fourth automatic cut-off valve is automatically cut off.
In this application, "optionally" means that subsequent operations or steps may or may not be performed.
The utility model has the advantages that:
the utility model is mainly suitable for the emergency maintenance of the LNG gasification station or the natural gas station, can ensure the use requirements of different gas volumes of the station, can also be suitable for the emergency use of the enterprise natural gas, and meets the requirement of stable heat value of the combustion medium of the enterprise. According to the device provided by the utility model, regional emergency air supply can be provided, air stop accidents in the operation process are effectively reduced or even eliminated, the safety risk caused by air supply recovery is avoided, the safe and continuous air supply of a user is ensured, and the metering ratio F1/F2 of the fuel gas and the air can be adjusted according to the quality requirement of the fuel gas and the use quality requirement of the user.
Drawings
Fig. 1 is a schematic diagram of an LNG emergency gasification apparatus with an adjustable heating value according to the present invention.
Description of reference numerals:
l1-a first LNG liquid inlet pipeline, L2-a second LNG liquid inlet pipeline, L3-a natural gas inlet burner pipeline, L4-a safety relief pipeline, L5-a flue gas discharge pipeline, L6-an NG gas outlet pipeline, L7-a clean discharge pipeline, L8-an air pipeline and L9-a circulating water pipeline;
QHQ-gasifier; RSQ-burner; XV 1-XV 4-first-fourth automatic cut-off valve; V1-V7-first-seventh manual valves; ZH 1-ZH 3-first-third check valves;
PSV 1-PSV 3-first-third safety valves; PV 1-PV 3-first-third pressure regulating valves; f1 — first flow meter (turbine flow meter); f2 — second flow meter (orifice plate flow meter);
P1-P3-first-third pressure gauge, T1-T2-first-second thermometer;
GE 101-gas leakage alarm device;
FV 1-flow regulating valve (equal proportional flow regulating valve); PU 1-circulating water pump; r1 — condenser; r2 — air buffer tank; c1-air compressor, M1-heat value instrument.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in fig. 1, the LNG emergency gasification device with an adjustable heat value comprises an LNG gasification system, a pressure regulating and metering system and a heat value balancing system, wherein:
the LNG gasification system comprises a burner RSQ, a gasifier QHQ and a condenser R1 which are connected in sequence, wherein in the embodiment shown in figure 1, an LNG liquid inlet pipeline comprises a first LNG liquid inlet pipeline L1 and a second LNG liquid inlet pipeline L2, a total LNG liquid inlet pipeline formed by merging the first LNG liquid inlet pipeline and the second LNG liquid inlet pipeline is connected with an LNG inlet of the gasifier QHQ, an NG gas outlet pipeline L6 of the gasifier QHQ is connected with a downstream gas using pipeline through a third manual valve V3,
the outlet of the burner RSQ is connected with the heating medium inlet of the gasifier, the heating medium outlet of the gasifier is connected with the condenser R1 through a pipeline (a flue gas discharge pipeline) L5, the gas outlet of the condenser R1 is connected with a flue gas diffusion pipeline,
wherein an NG gas outlet line L6 of the gasifier QHQ branches off a branch line L3 (i.e., a natural gas feed burner line) to which an inlet of the burner RSQ is connected,
the pressure-regulating metering system comprises a first cut-off valve XV1 arranged on an LNG liquid inlet pipeline (a total LNG liquid inlet pipeline), a second cut-off valve XV2 arranged on an NG outlet pipeline of the gasifier, a first pressure regulating valve PV1 and a first flow meter F1, and a second pressure regulating valve PV2 and a third cut-off valve XV3 arranged on one branch L3 (a natural gas inlet burner pipeline) branched from the NG gas outlet pipeline of the gasifier;
a heat value balancing system comprising an air compression device C1 connected via an air line L8 to the NG gas outlet line of the gasifier and a heat value meter M1 arranged on the NG gas outlet line downstream of the connection, a buffer tank R2, a second flow meter F2 and a flow control valve FV1 are sequentially arranged on an air pipeline, an outlet of an air compression device C1 is connected with an inlet of the buffer tank R2, an outlet of the buffer tank R2 is connected with an NG gas outlet pipeline through the second flow meter F2, the flow control valve FV1 and a fourth automatic shut-off valve XV4, a heat value meter M1 is provided downstream of the NG gas outlet line at the connection with the NG gas outlet line, wherein the heat value meter M1 and the flow regulating valve FV1 and/or the fourth automatic cut-off valve XV4 are interlocked and controlled, the gas mixing proportion can be regulated in real time, and when the volume percentage of the natural gas is close to or equal to 2 times of the upper explosion limit, the alarm is automatically sent out and the air source is cut off. The mixing amount of the air is strictly controlled, and the volume percentage of the natural gas is ensured to be higher than 2 times of the explosion limit of the natural gas.
An air bleed line may also be provided in the air line L8 along with a third pressure relief valve PSV3, which is provided with a third pressure regulating valve PV3, to protect the system from overpressure by tripping the third pressure relief valve PSV3 when the air line pressure exceeds 4.4 Barg. The air line L8 is preferably connected between the first flow meter F1 and the heat value meter M1 of the NG outlet line, the first flow meter F1 is preferably connected after the second automatic shut-off valve XV2 and the first pressure regulating valve PV1, and the third pressure gauge P3 and the second temperature gauge T2 are preferably connected before the second automatic shut-off valve XV2 and the first pressure regulating valve PV1 (i.e., closer to the NG gas outlet of the gasifier). The air line may further comprise a third check valve ZH3, preferably arranged after the fourth automatic shut-off valve XV4, to check the air into the gasifier NG gas outlet line L6.
The air compressing device C1 may further include a drying device connected after the compressor for drying the air, which is then introduced into the buffer tank R2.
An air relief line and a third safety valve PSV3 can be arranged on the air line of the gasifier QHQ, a third pressure regulating valve PV3 is arranged on the air relief line, and when the air line pressure exceeds 4.4Barg, the third safety valve PSV3 jumps to protect the system from overpressure.
The gasifier is preferably an immersion combustion type gasifier, the burner, the heat exchange tube and the shell are integrally designed, and fuel gas is taken from a gasified gas source without an external gas source.
The first LNG inlet pipeline L1 and the second LNG inlet pipeline L2 are respectively provided with a first manual valve V1 and a second manual valve V2, and the respective downstream of the first manual valve V1 and the second manual valve V2 are respectively provided with a first check valve ZH1 and a second check valve ZH 2. One end of the first LNG liquid inlet pipeline L1 and one end of the second LNG liquid inlet pipeline L2 can be connected with an LNG tank wagon or an LNG storage tank liquid outlet pipeline, and the other end (after being converged) is connected with an LNG inlet of the gasifier. The L1 and L2 pipelines can be connected or switched to use at the same time.
The natural gas inlet burner pipeline L3 has one end connected to the outlet pipeline of the gasifier and one end connected to the inlet pipeline of the burner, and the pipeline is mainly used for supplying natural gas to the burner and providing heat source for the LNG gasifier QHQ.
A safety relief pipeline L4 is connected to the NG gas outlet line of the gasifier, and a first safety valve PSV1 and a flame arrester FA1 are sequentially provided on the safety relief pipeline. One end of the safety relief pipeline L4 is connected with an NG gas outlet pipeline L6 of the gasifier QHQ, and the other end of the safety relief pipeline is vented to the atmosphere after passing through a flame arrester FA1, so that overpressure of the system is avoided.
The gasifier comprises a circulating water pipeline L9, one end of which is connected with the bottom of the gasifier and the other end is connected with the top of the gasifier. When the device operates, water is discharged from the bottom of the gasifier through two outlets simultaneously, a fifth manual valve V5 and a sixth manual valve V6 are arranged on two outlet pipelines respectively, a fourth manual valve V4 can be further arranged after the two outlet pipelines are converged, and heat exchange water in the gasifier is rapidly circulated by utilizing a circulating water pump PU1, so that the heat exchange efficiency is improved.
The gasifier comprises a gasifier drain line V7, one end of which is connected with the bottom of the gasifier and the other end is connected with the sewage disposal pool. The pipeline is mainly used for discharging heat exchange water in the gasifier when the device is not used for a long time.
The gasifier is internally provided with a liquid level meter LT001 for detecting the liquid level inside the gasifier, a gasifier temperature meter T1 for detecting the temperature inside the gasifier, and a gasifier pressure gauge P2 for detecting the pressure inside the gasifier. A first pressure gauge P1 for detecting the internal pressure of a branch pipe from which an NG gas outlet line of a gasifier branches is provided. When the liquid level of the gasifier detected by the liquid level meter is less than or equal to 85 percent of the height of QHQ, or the pressure of a branch pipe branched from an NG gas outlet pipeline of the gasifier detected by the first pressure gauge P1 is more than or equal to 15kPa, or the internal pressure of the gasifier detected by the gasifier pressure gauge (or the second pressure gauge) P2 is more than or equal to 20kPa, or the internal temperature of the gasifier detected by the gasifier temperature gauge T1 is more than or equal to 75 ℃, the third cut-off valve XV3 automatically cuts off and gives an alarm.
A third pressure gauge P3 and a second temperature gauge T2 are further arranged on an NG gas outlet pipeline L6 of the gasifier, and if the temperature T2 of the gasifier outlet pipeline L6 is less than or equal to minus 10 ℃ or P3 is more than or equal to 4Barg, or a gas leakage alarm GE101 gives an alarm when gas leakage occurs, an outlet cut-off valve XV1 gives an alarm and automatically cuts off the alarm.
A second safety valve PSV2 is arranged on the gasifier shell to protect the gasifier. When the gasifier tube side is cracked, LNG and NG leak to the shell side causing shell side pressure P2 ≧ 8Barg, they are diffused through PSV 2.
The utility model further provides an LNG emergency gasification method with an adjustable heat value, which comprises the following steps:
1) LNG liquid inlet step: LNG is supplied to the gasifier through an LNG liquid inlet pipeline, two LNG liquid inlet pipelines are preferably selected for ensuring the continuous liquid supply of the LNG, the first LNG liquid inlet pipeline L1 and the second LNG liquid inlet pipeline L2 can be switched to be used through a first manual valve V1 and a second manual valve V2, and liquid break is avoided;
2) LNG gasification step: when the device is started, a valve on an LNG liquid inlet pipeline, such as a first manual valve V1 or a second manual valve V2, is opened at a small flow rate, so that a small flow rate (such as 1-10% of the full flow rate and further about 3% of the full flow rate) of LNG slowly enters a gasifier through a liquid inlet pipeline, is gasified through heat exchange with water, is subjected to pressure regulation to 6-12kPa, further 8-11kPa, such as about 10kPa, through a second pressure regulating valve of a natural gas inlet pipeline, and enters a burner for combustion. The process is to provide a fuel gas source to the burner prior to full flow gasification. When the water temperature T1 of the gasifier QHQ reaches above 60 ℃, a valve (such as V1 or V2) on an LNG liquid inlet pipeline is completely opened, full-flow liquid inlet gasification is started, at the moment, a second automatic cut-off valve XV2 on an NG gas outlet pipeline L6 is automatically opened, and an LNG full-flow gasification process is started;
3) natural gas pressure regulating step: after LNG gasification begins, a first pressure regulating valve PV1 on an NG gas outlet pipeline L6 automatically detects the pressure behind a first pressure regulating valve PV1, regulates the pressure to 2-5 Barg, preferably 3-4 Barg, and enters a downstream gas pipe network;
4) fuel gas gasification pressure regulating step: after the LNG is gasified by the gasifier QHQ, a gas is taken from the NG gas outlet line L6 in an amount of about 1 to 10%, preferably about 3%, of the total gas amount in the NG gas outlet line, and the pressure is adjusted to 6 to 12kPa, further 8 to 11kPa, for example about 10kPa, and then fed into the combustor for combustion;
5) a heat value stabilizing step: after air is compressed by an air compression device C1 and optionally dried, the pressure reaches 2-6 Barg, preferably 3-5 Barg, such as 4Barg, the air is metered by a second flow meter F2 (an orifice plate flow meter) and a first flow meter (a turbine flow meter) F1 through a buffer tank R2, the volume ratio of F2/F1 is less than or equal to 3 percent (volume), such as 1-3 percent, so that the opening degree of a flow regulating valve FV1 is regulated, and the air enters an LNG gasifier and then enters a pipeline to regulate the heat value of natural gas.
In the step 1), if the temperature T2 of an NG gas outlet pipeline (gasifier outlet pipeline) L6 is less than or equal to-10 ℃ or P3 is more than or equal to 4Barg, or a gas leakage alarm GE101 gives a gas leakage alarm, a first automatic cut-off valve XV1 gives an alarm and is automatically cut off.
In the step 2), when gasifying, if the temperature T2 of an NG gas outlet pipeline (gasifier outlet pipeline) L6 is less than or equal to 0 ℃ or P3 is less than or equal to 1Barg, or a gas leakage alarm GE101 gives a gas leakage alarm, the first automatic cut-off valve XV1 gives an alarm and automatically cuts off the alarm.
In the step 3), if the temperature T2 of the gasifier outlet pipeline L6 is less than or equal to minus 10 ℃ or P3 is more than or equal to 4Barg, or the gas leakage alarm GE101 gives a gas leakage alarm, the second automatic cut-off valve XV2 gives an alarm and is automatically cut off.
In the step 4), when the liquid level LT001 of the gasifier is less than or equal to QHQ height 85%, or the pressure P1 of the fuel gas pipeline L3 is more than or equal to 15kpa, or the pressure P2 of the gasifier QHQ is more than or equal to 20kpa, or the temperature T1 of the gasifier QHQ is more than or equal to 75 ℃, the third automatic cut-off valve XV3 automatically cuts off and gives an alarm.
In the step 5), when the pressure of the air pipeline L8 exceeds 4.4Barg, the third safety valve PSV3 jumps to protect the system from overpressure, and the function is mainly suitable for places requiring stable heat value for gas use of factory enterprises.
In step 5), the specific adjusting proportion of a second flow meter F2 (orifice plate flow meter) and a first flow meter (turbine flow meter) F1 metering ratio F2/F1 is adjusted according to the gas quality requirement and the gas quality requirement used by a user, and when the proportion of the second flow meter F2 (orifice plate flow meter) and the first flow meter (turbine flow meter) F1 metering ratio F2/F1 exceeds a set value or the proportion of a heat value meter M1 exceeds a set value, the fourth automatic cut-off valve XV4 is automatically cut off.
The preferred embodiments of the present invention have been described above, however, it should be understood that the above description is for illustrative purposes only and does not constitute any limitation of the present invention. Many modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, and such modifications and equivalents are intended to be included within the scope of the utility model.
Claims (10)
1. The utility model provides an emergent gasification equipment of calorific value adjustable LNG, its includes LNG gasification system, pressure regulating measurement system, calorific value balanced system three, wherein:
the LNG gasification system comprises a burner, a gasifier and a condenser which are connected in sequence, wherein an LNG liquid inlet pipeline is connected with an LNG inlet of the gasifier, an NG gas outlet pipeline of the gasifier is connected with a downstream gas pipeline,
the outlet of the burner is connected with the heating medium inlet of the gasifier, the heating medium outlet of the gasifier is connected with the condenser through a pipeline, the gas outlet of the condenser is connected with the flue gas diffusion pipeline,
wherein, a branch pipe is branched from an NG gas outlet pipeline of the gasifier and is connected with an inlet of the combustor,
the pressure-regulating metering system comprises a first cut-off valve arranged on an LNG liquid inlet pipeline, a second cut-off valve arranged on an NG outlet pipeline of the gasifier, a first pressure regulating valve, a first flow meter and a branch pipe arranged on the NG gas outlet pipeline of the gasifier, namely the second pressure regulating valve and a third cut-off valve on a natural gas inlet burner pipeline;
the heat value balancing system comprises an air compression device connected with an NG gas outlet pipeline of the gasifier through an air pipeline and a heat value instrument arranged on the NG gas outlet pipeline at the downstream of the connection part, a buffer tank, a second flow meter and a flow regulating valve are sequentially arranged on the air pipeline, the outlet of the air compression device is connected with the inlet of the buffer tank, the outlet of the buffer tank is connected with the NG gas outlet pipeline through the second flow meter, the flow regulating valve and a fourth automatic shut-off valve, the downstream of the NG gas outlet pipeline at the connection part of the buffer tank and the NG gas outlet pipeline is provided with the heat value instrument, wherein the heat value instrument is interlocked and controlled with the flow regulating valve and/or the fourth automatic shut-off valve, and the gas mixing proportion can be adjusted in real time,
the gasifier is a submerged combustion gasifier.
2. The LNG emergency gasification device of claim 1, further comprising an air bleeding line and a third safety valve, wherein the air bleeding line is provided with a third pressure regulating valve, and the third safety valve trips to protect the system from overpressure when the air line pressure exceeds 4.4 Barg.
3. The emergency LNG gasification device according to claim 1, wherein a safety relief line is connected to the NG gas outlet line of the gasifier, and a first safety valve and a flame arrester are sequentially provided on the safety relief line.
4. The LNG emergency gasification device of claim 1, wherein the gasifier comprises a circulation water line, one end of the circulation water line is connected to the bottom of the gasifier, the other end of the circulation water line is connected to the top of the gasifier, and a circulation water pump is disposed on the circulation water line.
5. The emergency LNG vaporization device of claim 1, wherein the vaporizer includes a vaporizer drain line having one end connected to a bottom of the vaporizer and one end connected to a blowdown tank.
6. An LNG emergency gasification device according to any one of claims 1 to 5, characterized in that a liquid level meter for detecting the liquid level inside the gasifier, a gasifier temperature meter for detecting the temperature inside the gasifier, a gasifier pressure meter for detecting the pressure inside the gasifier, i.e. a second pressure meter, is arranged in the gasifier, a branch pipe branched from the NG gas outlet pipeline of the gasifier, i.e. a first pressure meter for detecting the pressure inside the branch pipe is arranged on the natural gas inlet burner pipeline, when the liquid level of the gasifier is less than or equal to 85% of the height of the gasifier, or the pressure of a branch pipe branched from the NG gas outlet pipeline of the gasifier is more than or equal to 15kPa, or the pressure inside the gasifier is more than or equal to 20kPa, or the temperature inside the gasifier is more than or equal to 75 ℃, the third cut-off valve is automatically switched off and gives an alarm.
7. The LNG emergency gasification device of any one of claims 1 to 5, further comprising a gas leakage alarm, wherein a third pressure gauge and a second temperature gauge are provided on the NG gas outlet line of the gasifier, and if the temperature of the gasifier outlet line is less than or equal to-10 ℃ or the pressure is greater than or equal to 4Barg, or if the gas leakage alarm occurs, the first automatic shutoff valve alarms and automatically shuts off.
8. The LNG emergency gasification device of any one of claims 1 to 5 wherein the first LNG feed line and the second LNG feed line are provided with a first manual valve and a second manual valve, respectively.
9. The LNG emergency gasification device of any one of claims 1 to 5 wherein the LNG feed line comprises a first LNG feed line and a second LNG feed line that are merged into a common LNG feed line that is connected to the LNG inlet of the gasifier.
10. The LNG emergency gasification apparatus of any one of claims 1 to 5, wherein a second safety valve for protecting the gasifier is provided on the gasifier shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122730583.1U CN216079300U (en) | 2021-11-09 | 2021-11-09 | LNG emergency gasification device with adjustable heat value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122730583.1U CN216079300U (en) | 2021-11-09 | 2021-11-09 | LNG emergency gasification device with adjustable heat value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216079300U true CN216079300U (en) | 2022-03-18 |
Family
ID=80660278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122730583.1U Active CN216079300U (en) | 2021-11-09 | 2021-11-09 | LNG emergency gasification device with adjustable heat value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216079300U (en) |
-
2021
- 2021-11-09 CN CN202122730583.1U patent/CN216079300U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202065680U (en) | Liquefied natural gas (LNG) gasification pressure regulating gas supply device | |
| CN111928119B (en) | Mine gas safe blending system and gas blending ratio control method | |
| CN212819205U (en) | Hydrogen energy source utilization gas mixing system | |
| CN111992071A (en) | Hydrogen energy utilization fuel gas mixing system and hydrogen and natural gas ratio control method | |
| CN113285100B (en) | Performance test system for hydrogen circulating pump of hydrogen fuel cell | |
| JP2002213695A (en) | City gas supplying method and device | |
| CN216079300U (en) | LNG emergency gasification device with adjustable heat value | |
| CN102103073B (en) | Device for monitoring content of organic matters in circulating water in anti-explosion area on line | |
| CN115127032A (en) | Natural gas hydrogen-mixing system | |
| CN113970065B (en) | LNG emergency gasification device and method with adjustable heat value | |
| CN107270119A (en) | LNG, BOG, EAG air temperature type gasification air supply system device | |
| KR101992640B1 (en) | Natural Gas Pressure Regulating Eqiupment Commissioning System | |
| CN106481983B (en) | Urban gate station Gas Pressure Regulating Equipment | |
| CN211780175U (en) | LNG vaporizing station intelligent operation system based on point supplies | |
| CN218994653U (en) | Vehicle-mounted liquid hydrogen supply system testing device | |
| CN215595733U (en) | Gas turbine natural gas pretreatment system | |
| CN114843556A (en) | Hydrogen circulating pump and ejector performance test system | |
| CN205664120U (en) | BOG pressure regulating measurement adds smelly sled dress device | |
| RU2716659C1 (en) | Mobile gas supply assembly | |
| CN220379449U (en) | Natural gas pressure regulating station system | |
| CN203494410U (en) | Automatic flow-adjusted gas mixer | |
| CN204201473U (en) | A kind of BOG of LNG landing stage formula gas station reclaims power generation system | |
| CN103234116B (en) | A kind of moving emergency natural gas supply system and moving emergency natural gas supply method | |
| CN102155620B (en) | System of compressed natural gas supply station and pressure regulation and gas supply method of system | |
| CN219673957U (en) | LNG gasification gas supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |