A high-pressure oxygen pipe network safety interlocking device
Patent Information
- Application Number
- CN202521676308.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-07
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-08-07
AI Technical Summary
如若滞后，经常会发生氧气管网压力瞬间高涨、极大的威胁氧泵安全、气化在运行气化炉氧煤比高高、安全阀起跳反冲力较大损坏阀门、管道弯曲变形甚至发生管线撕裂、管道爆燃的事故
当气化炉跳车时，直接通过空分DCS系统关联氧气放空阀及时将空分氧气放空阀打开至一定开度，再由氧气管网压力控制器控制氧气放空阀开度，减少了氧气管网压力表检测到压力升高再控制氧气放空阀的环节、也减少了氧气放空阀在小开度下频繁开关可能卡涩的几率，较大可能的保证了及时、安全、有效的氧气放空量，从而保证了氧气管网、氧泵及其它设备、人员安全。
Smart Images
Figure CN224836987U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high-pressure oxygen system technology, specifically a safety interlock device for high-pressure oxygen pipeline network. Background Technology
[0002] High-pressure oxygen systems are crucial pipeline systems in modern coal chemical enterprises. Their primary function is to transport high-purity oxygen through pipelines to the gasifier, where it undergoes a vigorous chemical reaction with coal-water slurry or pulverized coal under high temperature and pressure conditions to produce crude syngas. When the gasifier trips, releasing a large amount of high-pressure oxygen from the system, the traditional control method involves detecting the pressure rise signal using pressure gauges installed in the oxygen pipeline network, and then automatically adjusting (opening wider) the oxygen vent valve to release the high-pressure oxygen.
[0003] With the rapid development of coal chemical industry in recent years, the pressure of oxygen systems has been increasing, and the consumption of oxygen has also increased significantly. High-pressure oxygen valves experience slow flow regulation at small openings, and it takes time for pressure gauges to detect pressure increases and for valves to be controlled again. Oxygen vent valves, which need to be opened quickly, frequently experience jamming and delays. If this delay occurs, it can lead to sudden spikes in oxygen pipeline pressure, posing a significant threat to oxygen pump safety, causing high oxygen-to-coal ratios in gasifiers during operation, damaging safety valves due to excessive backlash, and even causing pipeline bending, deformation, tearing, and explosions. Utility Model Content
[0004] To address the problems of existing technologies, this utility model provides a safety interlock device for high-pressure oxygen pipeline networks, comprising: A liquid oxygen pump, the input end of which is connected to a liquid oxygen storage tank, is used to provide oxygen to the entire high-pressure oxygen system; A heat exchanger, the input end of which is connected to the output end of the liquid oxygen pump, and the output end of which is connected to the input end of the oxygen pipeline pressure gauge; The output end of the oxygen pipeline pressure gauge is connected to the high-pressure oxygen delivery regulating valve and the high-pressure oxygen venting valve. The high-pressure oxygen vent valve is installed on the vent pipeline after the oxygen pipeline pressure gauge; the oxygen pipeline pressure gauge controls the opening degree of the high-pressure oxygen vent valve. The high-pressure oxygen delivery regulating valve is installed on the pipeline at the output end of the heat exchanger, and the high-pressure oxygen delivery regulating valve is connected to each gasifier through a pipeline. The control signal terminals of each gasifier in the air separation DCS system are connected to the high-pressure oxygen vent valve through the air separation DCS system.
[0005] Furthermore, the gasifier includes at least three gasifiers, and all three gasifiers are connected to the air separation DCS system. The air separation DCS system controls the opening of the high-pressure oxygen vent valve through the oxygen pipeline pressure gauge based on the gasifier trip signal; and each of the gasifiers is interconnected.
[0006] Furthermore, the oxygen pipeline pressure gauge is equipped with an oxygen pipeline pressure controller, which controls the opening degree of the high-pressure oxygen vent valve through the air separation DCS system.
[0007] Furthermore, a gasification safety valve is installed on the outlet pipeline of each of the gasifiers.
[0008] Furthermore, the output end of the oxygen pipeline pressure gauge is also connected to the high-pressure oxygen safety valve in the air separation zone via a pipeline.
[0009] Furthermore, the high-pressure oxygen safety valve has a variable diameter inlet of DN300 / 100 and an outlet of DN500 / 150, while the vaporization safety valve has a variable diameter inlet of DN100 / 150.
[0010] The beneficial effects of this utility model are: When the gasifier trips, the oxygen vent valve is directly connected to the air separation DCS system and opened to a certain degree in a timely manner. Then, the oxygen pipeline pressure controller controls the opening of the oxygen vent valve. This reduces the need for the oxygen pipeline pressure gauge to detect pressure rise and control the oxygen vent valve. It also reduces the chance of the oxygen vent valve getting stuck due to frequent opening and closing at a small opening. This ensures a timely, safe, and effective oxygen venting volume, thereby guaranteeing the safety of the oxygen pipeline, oxygen pumps, other equipment, and personnel. Attached Figure Description
[0011] Figure 1 A schematic diagram of the principle of this utility model.
[0012] Figure label: In the diagram: 1 is the high-pressure oxygen delivery regulating valve, 2 is the high-pressure oxygen safety valve in the air separation zone, 3 is the vaporization safety valve, 4 is the high-pressure oxygen vent valve, 5 is the silica gel layer, 6 is the liquid oxygen pump, and 7 is the heat exchanger. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] Please see Figure 1 This utility model provides a safety interlock device for high-pressure oxygen pipeline networks, comprising: Liquid oxygen pump 6, the input end of which is connected to a liquid oxygen storage tank, is used to provide oxygen to the entire high-pressure oxygen system; Liquid oxygen pumps are used to extract cryogenic liquid oxygen and deliver it to downstream systems, providing an oxygen source for the entire high-pressure oxygen system. Heat exchanger 7, the input end of which is connected to the output end of liquid oxygen pump 6, and the output end of heat exchanger 7 is connected to the input end of oxygen pipeline pressure gauge 5; The heat exchanger is used to heat and vaporize the cryogenic liquid oxygen delivered by the liquid oxygen pump into gaseous oxygen; the output end of the heat exchanger is connected to the input end of the pressure gauge of the oxygen pipeline network, so that the vaporized oxygen enters the oxygen pipeline network. The output end of the oxygen pipeline pressure gauge 5 is connected to the high-pressure oxygen delivery regulating valve 1 and the high-pressure oxygen venting valve 4. Oxygen pipeline pressure gauges are used to detect the pressure data of the oxygen pipeline in real time and transmit the pressure signal to the subsequent valves; The high-pressure oxygen vent valve 4 is installed on the vent pipeline after the oxygen pipeline pressure gauge 5; the oxygen pipeline pressure gauge 5 controls the opening degree of the high-pressure oxygen vent valve 4. The high-pressure oxygen delivery regulating valve 1 is installed on the pipeline at the output end of the heat exchanger 7, and the high-pressure oxygen delivery regulating valve 1 is connected to each gasifier through a pipeline. The high-pressure oxygen delivery regulating valve is installed on the main pipeline at the output end of the heat exchanger (located after the oxygen network pressure gauge and before the gasifier branch pipeline) to regulate the oxygen flow rate delivered to each gasifier and ensure that the amount of oxygen delivered matches the gasifier's demand. The control signal terminals of each gasifier in the air separation DCS system are connected to the high-pressure oxygen vent valve 4 through the air separation DCS system.
[0015] The air separation DCS system receives the operation or trip signal of the gasifier and directly controls the high-pressure oxygen vent valve to act quickly when the gasifier trips, so as to achieve emergency venting.
[0016] In some embodiments, the gasifier includes at least three gasifiers, and all three gasifiers are connected to an air separation DCS system. The air separation DCS system controls the opening of the high-pressure oxygen vent valve 4 through the oxygen pipeline pressure gauge 5 according to the gasifier trip signal; and each of the gasifiers is linked to each other.
[0017] The system includes at least three gasifiers (Gasifier A, Gasifier B, and Gasifier C), all of which are connected to the air separation DCS system. The air separation DCS system receives the operating signals from each gasifier (usually in a 2-on-1-backup mode). When a trip signal is detected from any one or more gasifiers, the system outputs a control command to the high-pressure oxygen vent valve without waiting for the oxygen pipeline pressure to rise. This causes the valve to quickly open to a preset opening degree (20%, corresponding to the oxygen quantity at 50% load for a single gasifier) plus the opening degree before the trip. The system then hands over the control to the oxygen pipeline pressure controller for automatic adjustment. Furthermore, the gasifiers are interconnected, and signal sharing and coordinated response are achieved through the air separation DCS system, ensuring precise control of the venting volume when a single or multiple gasifiers trip.
[0018] In some embodiments, the oxygen pipeline pressure gauge 5 is equipped with an oxygen pipeline pressure controller, which controls the opening degree of the high-pressure oxygen vent valve 4 through the air separation DCS system.
[0019] The oxygen pipeline pressure gauge integrates an oxygen pipeline pressure controller, which forms a closed-loop control with the high-pressure oxygen vent valve through the air separation DCS system. Under normal conditions, the pressure controller calculates the required opening degree based on the deviation between the real-time pressure of the oxygen pipeline and the set value, and drives the high-pressure oxygen vent valve to adjust it through the air separation DCS system. When the gasifier trips, the air separation DCS system prioritizes the execution of emergency control logic. After the system pressure stabilizes, the pressure controller takes over again and continues to adjust the valve opening through the air separation DCS, achieving seamless switching between normal and emergency operating conditions.
[0020] In some embodiments, a gasification safety valve 3 is provided on the outlet pipeline of each of the gasifiers.
[0021] Among them, the gasification safety valve is used to automatically open when the internal pressure of the gasifier exceeds the threshold, directly releasing the high-pressure oxygen inside the furnace. It serves as redundant protection for the high-pressure oxygen vent valve, preventing overpressure accidents inside the furnace caused by malfunctions such as valve jamming.
[0022] In some embodiments, the output end of the oxygen pipeline pressure gauge 5 is also connected to the high-pressure oxygen safety valve 2 in the air separation zone via a pipeline.
[0023] The high-pressure oxygen safety valve in the air separation boundary area is installed on the main pipeline of the oxygen pipeline network (on the side close to the air separation DCS system). It is used to automatically open when the pressure of the oxygen pipeline network exceeds the safety threshold of the air separation boundary area, so as to release the high-pressure oxygen in the pipeline network. Together with the vaporization safety valve and the high-pressure oxygen vent valve, it forms a three-level safety protection system to ensure the safety of the entire oxygen pipeline network.
[0024] In some embodiments, the high-pressure oxygen safety valve 2 has a variable diameter inlet of DN300 / 100 and an outlet of DN500 / 150, and the vaporization safety valve 3 has a variable diameter inlet of DN100 / 150.
[0025] See Figure 1 Analog digital signals refer to the operating status signals of the gasifier (such as the "run / trip" switch status, transmitted in analog form), and their relationship with the air separation DCS is as follows: Analog digital signals are input to the air separation DCS system to provide real-time feedback on the operating status of each gasifier (e.g., when gasifier A trips, the corresponding digital signal triggers the "trip" status). After receiving the analog switch signal, the air separation DCS system triggers the preset interlock logic: when any one or more gasifiers trip, it directly outputs an emergency control command to the high-pressure oxygen vent valve 4 (e.g., rapidly opening it to 20%+ of the pre-trip opening degree) without waiting for the pressure to rise, thus achieving emergency venting. The air separation DCS system is the core hub, simultaneously receiving pressure signals from PIC3701.51.Y01 and status signals from analog switches. It prioritizes responding to emergency interlock logic (trip signals triggered by analog switches). Once the system stabilizes, it hands over control to the pressure control logic of PIC3701.51.Y01, achieving seamless switching between "emergency response and normal regulation".
[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A safety interlock device for a high-pressure oxygen pipeline network, characterized in that, include: A liquid oxygen pump, the input end of which is connected to a liquid oxygen storage tank, is used to provide oxygen to the entire high-pressure oxygen system; A heat exchanger, the input end of which is connected to the output end of the liquid oxygen pump, and the output end of which is connected to the input end of the oxygen pipeline pressure gauge; The output end of the oxygen pipeline pressure gauge is connected to the high-pressure oxygen delivery regulating valve and the high-pressure oxygen venting valve. The high-pressure oxygen vent valve is installed on the vent pipeline after the oxygen pipeline pressure gauge; the oxygen pipeline pressure gauge controls the opening degree of the high-pressure oxygen vent valve. The high-pressure oxygen delivery regulating valve is installed on the pipeline at the output end of the heat exchanger, and the high-pressure oxygen delivery regulating valve is connected to each gasifier through a pipeline. The control signal terminals of each gasifier in the air separation DCS system are connected to the high-pressure oxygen vent valve through the air separation DCS system.
2. The high-pressure oxygen pipeline safety interlock device according to claim 1, characterized in that, The gasifier includes at least three gasifiers, and all three gasifiers are connected to the air separation DCS system. The air separation DCS system controls the opening of the high-pressure oxygen vent valve through the oxygen pipeline pressure gauge based on the gasifier trip signal. Furthermore, each of the gasifiers is interconnected.
3. The high-pressure oxygen pipeline safety interlock device according to claim 1, characterized in that, The oxygen pipeline pressure gauge is equipped with an oxygen pipeline pressure controller, which controls the opening degree of the high-pressure oxygen vent valve through the air separation DCS system.
4. The high-pressure oxygen pipeline safety interlock device according to claim 1, characterized in that, Each of the gasifiers is equipped with a gasification safety valve on its outlet pipeline.
5. The high-pressure oxygen pipeline safety interlock device according to claim 4, characterized in that, The output end of the oxygen pipeline pressure gauge is also connected to the high-pressure oxygen safety valve in the air separation zone via a pipeline.
6. The high-pressure oxygen pipeline safety interlock device according to claim 5, characterized in that, The high-pressure oxygen safety valve has a diameter variation of DN300 / 100 at the inlet and DN500 / 150 at the outlet, while the vaporization safety valve has a diameter variation of DN100 / 150 at the inlet.