Natural gas hydrogen blending safety pressure relief device

Abstract

The utility model relates to natural gas blending equipment technical field, concretely relates to a natural gas hydrogen blending safety pressure relief device, it includes: multistage pressure reducing system, is constituted by series arrangement one stage pressure reducing valve group, two stage pressure reducing valve group and three stage fine tuning valve group, is used for gradually reducing pressure to target pressure for high pressure natural gas, safety relief system includes pressure relief branch and main safety valve, is used for grading release overpressure gas, combustion formula release processing apparatus, is located in the release export, is used for carrying out combustion treatment to release gas, intelligent monitoring system includes pressure sensor, flow sensor and PLC controller, is used for real -time monitoring and adjusting system pressure. The utility model discloses through multistage pressure reducing cooperative control, hydrogen compatible material optimization, safe combustion / recovery type release and intelligent monitoring system etc. Innovative design, solve the overpressure protection under the hydrogen blending environment, leakage inhibition and discharge safety and so on key technical problems, provide the security guarantee for the large -scale application of natural gas blending technology.

Description

Technical Field

[0001] This utility model relates to the technical field of natural gas blending equipment, specifically to a natural gas hydrogen blending safety pressure relief device. Background Technology

[0002] With the energy structure shifting towards low-carbon development, natural gas blending technology has become an important approach to achieving clean energy utilization. However, natural gas and hydrogen have significantly different physical properties. Hydrogen's high diffusivity, low density, and strong permeability lead to increased pipeline pressure fluctuations during blending, increasing the risk of system overpressure and posing a serious challenge to traditional pressure relief devices. Existing technologies for natural gas-hydrogen blending safety pressure relief devices generally suffer from insufficient pressure control accuracy, hydrogen-induced material failure, safety hazards during the relief process, and low levels of intelligence.

[0003] Traditional pressure relief devices mostly employ mechanical single-stage pressure reduction structures, which suffer from slow response and struggle to adapt to the highly dynamic pressure changes of hydrogen-blended natural gas, easily leading to fluctuations in downstream processes. Furthermore, the hydrogen environment easily induces hydrogen embrittlement of metals and aging of sealing materials, reducing device reliability. During the venting process, directly releasing flammable gases can easily form explosive mixtures, and traditional flame arresters have limited protective effectiveness at high hydrogen ratios. Simultaneously, existing devices lack real-time monitoring and intelligent control capabilities, failing to achieve precise pressure regulation and safety warnings, increasing system operational risks. Utility Model Content

[0004] This utility model provides a safe pressure relief device for natural gas blending with hydrogen. Through innovative designs such as multi-stage pressure reduction and coordinated control, optimization of hydrogen-compatible materials, safe combustion / recovery-type release, and intelligent monitoring system, it solves key technical problems such as overpressure protection, leakage suppression, and emission safety in hydrogen blending environments, providing a safety guarantee for the large-scale application of natural gas blending technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a natural gas hydrogen blending safety pressure relief device, comprising: a multi-stage pressure reduction system, consisting of a primary pressure reducing valve group, a secondary pressure reducing valve group, and a tertiary fine-tuning valve group arranged in series, for progressively reducing the pressure of high-pressure natural gas to the target pressure; a safety relief system, including a pressure relief branch and a main safety valve, for staged relief of overpressure gas; a combustion-type relief treatment device, located at the relief outlet, for combustion treatment of the relief gas; and an intelligent monitoring system, including a pressure sensor, a flow sensor, and a PLC controller, for real-time monitoring and adjustment of system pressure.

[0006] Preferably, the secondary pressure reducing valve group adopts a main-standby parallel design, with the pressure setpoint after the main valve being higher than that of the standby valve, so as to maintain pressure stability when the flow rate changes.

[0007] Preferably, the combustion-type venting treatment device includes a mixing chamber, a central tube, an air inlet pipe, and a spiral nozzle, wherein the vented gas is premixed with combustion air before combustion.

[0008] Preferably, it also includes a gas recovery module for collecting the released gas and returning it to the pipeline network or backup system.

[0009] Preferably, the pressure relief branch and the main safety valve adopt a staged relief strategy, selecting the opening degree of the regulating valve, the pressure relief branch discharge, or the main safety valve to fully open and relieve pressure according to the degree of overpressure.

[0010] Preferably, the three-stage fine-tuning valve group adopts an electro-hydraulic regulating valve, and the opening degree is adjusted in real time by the PLC controller according to the pressure feedback signal.

[0011] Preferably, the key components of the device are made of hydrogen embrittlement resistant materials, including austenitic stainless steel valve body, nickel-based alloy valve stem and hydrogenated nitrile rubber seals.

[0012] Preferably, the venting system is equipped with a flame arrester and a nitrogen purging device to prevent backfire and the formation of an explosive mixture.

[0013] Preferably, the intelligent monitoring system further includes a predictive maintenance module, which analyzes operational data based on machine learning and provides early warnings of potential faults.

[0014] Preferably, the device adopts a modular skid-mounted structure, which facilitates installation and maintenance.

[0015] The beneficial effects of this utility model are as follows: This natural gas hydrogen blending safety pressure relief device adopts a multi-stage pressure reduction + intelligent monitoring + safety relief coordinated control strategy. During operation, high-pressure natural gas is sequentially pressure-reduced through primary, secondary, and tertiary valve groups to ensure a stable pressure drop and avoid pressure surges caused by single-stage pressure reduction. The primary pressure-reducing valve group reduces the inlet high pressure to an intermediate pressure; the secondary pressure-reducing valve group operates in parallel with a main line maintaining the target pressure, while the backup line automatically replenishes pressure when the flow rate increases; the tertiary fine-tuning valve group is controlled in real-time by a PLC to ensure that the outlet pressure fluctuation is ≤±2%. Its safety relief system adopts a graded relief strategy: slight overpressure is automatically adjusted by the regulating valve opening; in cases of moderate overpressure, the pressure relief branch opens for partial discharge; and in cases of severe overpressure, the main safety valve fully opens for rapid pressure relief and cuts off the gas supply. The discharged gas is premixed with combustion air in the mixing chamber and then combusted through a spiral nozzle to form a stable flame, avoiding the risk of direct discharge. Real-time data is collected by pressure / flow sensors, the PLC dynamically adjusts the valve opening, and machine learning is used to predict equipment status and provide early warnings of malfunctions. Compared to traditional pressure relief devices, this system features three-stage pressure reduction, parallel operation of main and backup systems, and electro-hydraulic fine-tuning, achieving high-precision pressure regulation. Its hydrogen-embrittlement-resistant materials and micro-leakage-proof structure adapt to hydrogen-blended environments. A graded pressure relief strategy, combustion treatment, and flame arrestor protection eliminate the risk of combustion and explosion. Real-time monitoring and predictive maintenance reduce reliance on manual labor. The skid-mounted structure facilitates rapid deployment and reduces total lifecycle costs. Therefore, this device is particularly suitable for natural gas transmission and distribution systems with a hydrogen blending ratio of ≤30%, providing crucial safety assurance for the large-scale utilization of hydrogen energy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] In the diagram: 1. Primary pressure reducing valve assembly; 2. Secondary pressure reducing valve assembly; 3. Tertiary fine-tuning valve assembly; 4. Pressure relief branch; 5. Main safety valve; 6. Relief treatment device; 7. PLC controller; 8. Gas recovery module. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] according to Figure 1 As shown, a natural gas hydrogen blending safety pressure relief device includes: a multi-stage pressure reduction system consisting of a primary pressure reducing valve group 1, a secondary pressure reducing valve group 2, and a tertiary fine-tuning valve group 3 arranged in series, used to progressively reduce the pressure of high-pressure natural gas to the target pressure. The secondary pressure reducing valve group 2 adopts a main-standby parallel design, with the pressure setpoint after the main valve being higher than that of the standby valve to maintain pressure stability during flow changes. The tertiary fine-tuning valve group 3 uses electro-hydraulic regulating valves, whose opening is adjusted in real time by a PLC controller 7 based on pressure feedback signals. The safety relief system includes a pressure relief branch 4 and a main safety valve 5 for staged release of overpressure gas. The pressure relief branch 4 and the main safety valve 5 employ a staged release strategy, selecting the valve opening, pressure relief branch 4 discharge, or main safety valve 5 fully open for pressure relief based on the degree of overpressure. The safety relief system is equipped with a flame arrester and a nitrogen purging device to prevent backfire and the formation of explosive mixtures. A combustion-type venting treatment device 6, located at the vent outlet, is used to combust the vented gas. It includes a mixing chamber, a central pipe, an air inlet pipe, and a spiral nozzle. The vented gas is pre-mixed with combustion air before combustion. An intelligent monitoring system, including pressure sensors, flow sensors, and a PLC controller 7, is used to monitor and regulate system pressure in real time. This system also includes a predictive maintenance module that analyzes operational data based on machine learning to provide early warnings of potential faults. A gas recovery module 8 is also included to collect the vented gas and return it to the pipeline network or backup system. Furthermore, the device adopts a modular skid-mounted structure for easy installation and maintenance, and key components are made of hydrogen-embrittlement-resistant materials, including austenitic stainless steel valve bodies, nickel-based alloy valve stems, and hydrogenated nitrile rubber seals.

[0021] This natural gas hydrogen blending safety pressure relief device adopts a multi-stage pressure reduction + intelligent monitoring + safety relief coordinated control strategy. During operation, high-pressure natural gas is sequentially pressure-reduced through primary, secondary, and tertiary valve groups to ensure a stable pressure drop and avoid pressure surges caused by single-stage pressure reduction. Primary pressure reducing valve group 1 reduces the inlet high pressure to an intermediate pressure; secondary pressure reducing valve group 2 operates in parallel with a main line maintaining the target pressure, while the backup line automatically replenishes pressure when the flow rate increases; tertiary fine-tuning valve group 3 is controlled in real-time by PLC controller 7 to ensure outlet pressure fluctuations are ≤±2%. Its safety relief system employs a graded relief strategy: slight overpressure is automatically adjusted by regulating valves; moderate overpressure occurs when relief branch 4 opens for partial discharge; and severe overpressure occurs when the main safety valve 5 fully opens for rapid pressure relief and cuts off the gas supply. The discharged gas is premixed with combustion air in the mixing chamber and then combusted through a spiral nozzle to form a stable flame, avoiding the risk of direct discharge. Real-time data is collected by pressure / flow sensors, and PLC controller 7 dynamically adjusts valve openings, combining machine learning to predict equipment status and provide early warnings of malfunctions.

[0022] Compared to traditional pressure relief devices, this system features three-stage pressure reduction, parallel operation of main and backup systems, and electro-hydraulic fine-tuning, achieving high-precision pressure regulation. Its hydrogen-embrittlement-resistant materials and micro-leakage-proof structure adapt to hydrogen-blended environments. A graded pressure relief strategy, combustion treatment, and flame arrestor protection eliminate the risk of combustion and explosion. Real-time monitoring and predictive maintenance reduce reliance on manual labor. The skid-mounted structure facilitates rapid deployment and reduces total lifecycle costs. Therefore, this device is particularly suitable for natural gas transmission and distribution systems with a hydrogen blending ratio of ≤30%, providing crucial safety assurance for the large-scale utilization of hydrogen energy.

[0023] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A natural gas hydrogen blending safety pressure relief device, characterized in that, include: The multi-stage pressure reduction system consists of a first-stage pressure reducing valve group (1), a second-stage pressure reducing valve group (2), and a third-stage fine-tuning valve group (3) arranged in series, used to reduce the pressure of high-pressure natural gas to the target pressure step by step; The safety relief system includes a pressure relief branch (4) and a main safety valve (5) for staged relief of overpressure gas; A combustion-type venting treatment device (6) is provided at the venting outlet for venting gas combustion treatment; The intelligent monitoring system includes a pressure sensor, a flow sensor and a PLC controller (7) for real-time monitoring and adjustment of system pressure.

2. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The secondary pressure reducing valve group (2) adopts a main and backup parallel design, with the pressure setting value after the main valve being higher than that of the backup valve, so as to maintain pressure stability when the flow rate changes.

3. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The combustion-type venting treatment device (6) includes a mixing chamber, a central tube, an air inlet pipe, and a spiral nozzle. The venting gas is premixed with the combustion-supporting air before combustion.

4. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, It also includes a gas recovery module (8) for collecting the released gas and returning it to the pipeline network or backup system.

5. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The pressure relief branch (4) and the main safety valve (5) adopt a graded relief strategy, and the opening degree of the regulating valve, the pressure relief branch (4) discharges or the main safety valve (5) is fully opened to relieve pressure according to the degree of overpressure.

6. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The three-stage fine-tuning valve group (3) adopts an electro-hydraulic regulating valve, and the opening degree is adjusted in real time by the PLC controller (7) according to the pressure feedback signal.

7. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The key components of the device are made of hydrogen-resistant materials, including austenitic stainless steel valve body, nickel-based alloy valve stem, and hydrogenated nitrile rubber seals.

8. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The venting system is equipped with a flame arrester and a nitrogen purging device to prevent backfire and the formation of explosive mixtures.

9. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The intelligent monitoring system also includes a predictive maintenance module, which analyzes operational data based on machine learning and provides early warnings of potential faults.

10. The natural gas hydrogen blending safety pressure relief device according to claim 1, characterized in that, The device adopts a modular skid-mounted structure, which facilitates installation and maintenance.

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