A system for purging a long-lasting lamp

Abstract

The utility model discloses a long lasting light purging system belongs to gasification device technical field, and this system includes carbon dioxide gas source, long lasting light subassembly and purging pipeline, and long lasting light subassembly includes long lasting light, is separately provided with long lasting light oxygen gas end purging point and long lasting light burner fire detection purging point on the long lasting light, the purging pipeline includes the purging gas main pipe that draws out from carbon dioxide continuous jar export, be equipped with the filter on the purging gas main pipe, the export branch of filter is first branch and second branch, first branch is connected to long lasting light oxygen gas end purging point, and second branch is connected to long lasting light burner fire detection purging point, and the fracture of original nitrogen gas pipeline on first branch and second branch is blocked. The utility model is used to solve the technical problem of the nitrogen gas into system after long lasting light shutdown, leads to the decrease of effective gas purity, the increase of energy consumption and the rise of production cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of gasification devices, specifically relating to a continuous lamp purging system. Background Technology

[0002] In existing technologies, gasifiers in gasification units are typically equipped with a continuous lamp system, requiring medium-pressure nitrogen as the protective medium for both the oxygen terminal pipeline purging gas and the continuous lamp burner flame detector purging gas. For example, in conventional designs, medium-pressure nitrogen at 5.6 MPa is used for purging, with a flow rate of 210 Nm³ / h for the oxygen terminal pipeline purging gas and a continuous flow rate of 35 Nm³ / h for the continuous lamp burner flame detector purging gas. The total nitrogen consumption for a single gasifier is 245 Nm³ / h. 3 / h. The nitrogen gas is usually supplied at a low pressure of 0.7 MPa by the air separation unit, and then pressurized to 5.6 MPa by the nitrogen compressor before use.

[0003] However, when the continuous lamps are turned off to conserve fuel gas, the aforementioned purging nitrogen continues to enter the system, causing a series of technical problems. First, the mixing of nitrogen with the syngas reduces the purity of effective gases (such as carbon monoxide and hydrogen). Taking five gasifiers as an example, the total nitrogen injection amount reaches 1225 Nm³. 3 Increasing the yield per hour can increase the nitrogen content in the syngas by 0.1%–0.2%. This not only reduces the effective gas yield but also affects the operation of downstream processes. Due to the stable chemical properties of nitrogen, the downstream low-temperature methanol washing unit cannot effectively remove nitrogen. Nitrogen, along with carbon monoxide, enters the synthesis reactor but cannot participate in the reaction, gradually accumulating within the system and causing an increase in reactor pressure. When the pressure exceeds the design limit, the carbon monoxide and nitrogen mixture must be vented to the flare system through a vent valve, resulting in a waste of effective gas.

[0004] Secondly, the continuous demand for purging nitrogen necessitates the long-term operation of the nitrogen compressor. Nitrogen compressor motors typically have high power ratings (e.g., 710 kW), which significantly increases energy consumption and accelerates equipment wear, raising the risk of failure. Furthermore, since purging nitrogen shares a nitrogen source with units such as the coal mill system, nitrogen supply shortages can occur when the coal mill system trips or experiences load fluctuations. This forces the air separation unit to frequently adjust its load, increasing energy consumption and potentially leading to safety hazards related to substandard nitrogen purity.

[0005] Therefore, the problems of nitrogen resource waste, increased energy consumption, and insufficient system stability in existing technologies urgently need to be improved. Utility Model Content In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a continuous lamp purging system to solve the technical problems of nitrogen entering the system after the continuous lamp is turned off, which leads to a decrease in effective gas purity, an increase in energy consumption, and an increase in production costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a continuous lamp purging system, including a carbon dioxide gas source, a continuous lamp assembly, and a purging pipeline. The continuous lamp assembly includes a continuous lamp, which is provided with a continuous lamp oxygen end purging point and a continuous lamp burner flame detection purging point. The purging pipeline includes a purging gas main pipe led out from the outlet of the continuous carbon dioxide tank. The purging gas main pipe is equipped with a filter. The outlet of the filter branches into a first branch and a second branch. The first branch is connected to the continuous lamp oxygen end purging point, and the second branch is connected to the continuous lamp burner flame detection purging point. The breaks in the original nitrogen pipelines on the first and second branches are sealed.

[0007] Preferably, the filter is equipped with a differential pressure gauge.

[0008] Preferably, a flow meter is provided on the first branch.

[0009] Preferably, the entire pipeline of the carbon dioxide gas source is equipped with a steam tracing system.

[0010] Preferably, the steam tracing system covers all pipelines supplying carbon dioxide, including existing differential pressure gauge dead zone sections.

[0011] Preferably, the steam tracing system includes a steam tracing pipe, which is wound around the periphery of the carbon dioxide gas source pipeline, and the inlet of the steam tracing pipe is connected to the outlet of the tracing station.

[0012] Preferably, the outer circumferential surface of the steam tracing pipe is provided with a heat preservation device.

[0013] Preferably, the outer surface of the heat preservation device is provided with an aluminum foil reflective layer.

[0014] Preferably, the breaks in the original nitrogen pipelines on the first and second branches are sealed using blind flanges or gate valves.

[0015] Preferably, the blind plate or gate valve is equipped with an identification plate.

[0016] Preferably, the pressure of the carbon dioxide gas source is 5.5-7 MPa.

[0017] More preferably, the pressure of the carbon dioxide gas source is 5.6 MPa. A carbon dioxide gas source pressure of 5.6 MPa provides sufficient purging power to ensure purging effectiveness; furthermore, the higher initial pressure helps overcome pipeline resistance, ensuring that carbon dioxide can be smoothly delivered to the purging point.

[0018] Preferably, the continuous carbon dioxide tank is filled with carbon dioxide. Filling the continuous carbon dioxide tank with carbon dioxide ensures a continuous supply capacity of the system, avoids operational interruptions caused by frequent changes in gas sources, and is beneficial to production continuity.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a continuous lamp purging system that uses carbon dioxide instead of traditional nitrogen for purging. Specifically, high-pressure carbon dioxide is delivered to the oxygen terminal purging point and burner flame detector purging point on the continuous lamp via a purging pipeline. Simultaneously, the original nitrogen pipeline interfaces are explicitly sealed, physically eliminating the possibility of nitrogen accidentally entering the system. The purpose of purging is to remove combustible gases or air from the pipelines and furnace when the continuous lamp is not in operation, preventing the formation of explosive mixtures or equipment corrosion due to the presence of oxygen. While traditional nitrogen purging achieves safety, nitrogen can mix into the effective gases of subsequent processes (such as hydrogen and carbon monoxide), leading to a decrease in product gas purity. This system directly improves the purity of the effective gases. Since carbon dioxide is usually an inert component or even a reactant in subsequent chemical reactions, its mixing will not dilute the effective gases or affect catalyst activity. This not only increases product value but also reduces the energy consumption and cost of subsequent gas separation and purification. In addition, the filter outlet is branched into a first branch and a second branch. The first branch is connected to the oxygen terminal purging point of the continuous lamp, and the second branch is connected to the flame detector purging point of the continuous lamp burner. This clarifies two specific purging points, making the purging more targeted and ensuring the safe shutdown and startup of the continuous lamp system more effectively.

[0020] Furthermore, the filter is equipped with a differential pressure gauge, allowing for real-time monitoring of filter clogging. This facilitates predictive maintenance, ensuring unobstructed purging airflow and preventing purging failures due to filter blockage, thereby improving system reliability.

[0021] Furthermore, the flow meter installed on the first branch line can accurately control and display the carbon dioxide flow rate to the oxygen terminal purging point of the continuous lamp. This ensures the stability and monitorability of the purging effect, avoids insufficient or excessive purging gas waste, and achieves refined process management.

[0022] Furthermore, the entire carbon dioxide gas supply pipeline is equipped with a steam tracing system. During decompression, carbon dioxide may absorb heat, causing a sudden temperature drop and forming dry ice that blocks the pipeline. Full-range heat tracing, covering all pipe sections including existing dead zones, effectively prevents carbon dioxide phase change and crystallization, ensuring its stable gaseous flow throughout the pipeline. This eliminates systemic risks caused by pipeline blockage, guarantees the absolute reliability of purging, and maintains the pipeline temperature above the carbon dioxide dew point temperature, thus resolving the carbon dioxide condensation problem.

[0023] Furthermore, it was clarified that a steam tracing pipe wrapped around the perimeter of the pipeline is used as the heat source. This method can achieve efficient heat conduction through the metal pipe wall, providing continuous and uniform heat compensation for the carbon dioxide in the pipeline and preventing its temperature from dropping below the freezing point.

[0024] Furthermore, the addition of insulation to the outside of the steam tracing pipe significantly reduces heat loss to the surrounding environment. This not only saves energy and reduces consumption, but more importantly, it maintains the temperature stability of the tracing pipe itself and the tracing pipeline, effectively copes with ambient temperature fluctuations, and improves the robustness of the entire system.

[0025] Furthermore, the addition of an aluminum foil reflective layer effectively reflects thermal radiation (infrared rays), reflecting back the heat radiated from the system's interior, thus creating more comprehensive thermal insulation. This ensures better temperature maintenance of the carbon dioxide pipeline in cold environments, significantly reducing energy consumption for steam tracing and achieving energy conservation and cost reduction. The aluminum foil layer itself has excellent moisture-proof and sealing properties. It acts as a barrier, effectively preventing external moisture such as water vapor and rainwater from penetrating the internal insulation material. If the insulation material becomes damp, its insulation performance will drop sharply, and a humid environment will accelerate the corrosion of external pipelines. The aluminum foil layer thus protects the insulation layer and pipelines, improving the durability and reliability of the entire heat tracing system. Furthermore, using blind flanges can achieve permanent sealing, or gate valves can achieve switchable sealing, isolating the purge gas main from the original nitrogen pipeline, providing a flexible and reliable implementation option to adapt to different process requirements and operating habits.

[0026] Furthermore, after the original nitrogen pipeline was sealed, clear signage prevented maintenance and repair personnel from mistakenly believing the pipeline was still usable or ready for use, thus avoiding accidental disassembly or opening and resulting in high-pressure carbon dioxide leaks, and preventing serious safety accidents. It also facilitated operators and maintenance personnel in quickly and accurately understanding the current system configuration without needing to consult complex drawings or rely on personal memory. This significantly reduced the time spent on inspections, troubleshooting, and repairs, improving work efficiency. Attached Figure Description

[0027] Figure 1 This is a structural diagram of the continuous lamp blowing system of this utility model; Wherein: 1-Continuous light; 11-First branch; 12-Second branch; 2-Filter; 3-Break; 4-Nitrogen source; 41-Original nitrogen pipeline; 5-Carbon dioxide source; 6-Oxygen source; 7-Purge gas main pipe; 8-Gas source switching device; 9-Heat exchanger. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 See Figure 1 This embodiment 1 provides a continuous lamp purging system, including a carbon dioxide gas source 5, a continuous lamp assembly, and a purging pipeline. The continuous lamp assembly includes a continuous lamp 1, which has an oxygen end purging point and a burner flame detection purging point. The purging pipeline includes a purging gas main pipe 7 leading from the outlet of the continuous carbon dioxide tank. A filter 2 is provided on the purging gas main pipe 7. The outlet branches of the filter 2 are a first branch 11 and a second branch 12. The first branch 11 is connected to the oxygen end purging point of the continuous lamp, and the second branch 12 is connected to the burner flame detection purging point. The break 3 of the original nitrogen pipeline 41 on the first branch 11 and the second branch 12 is sealed. More preferably, a branch is opened on the original nitrogen pipeline 41 of the first branch 11 to connect to the purging gas main pipe 7. A gas source switching device is provided at the connection point for freely switching between nitrogen and carbon dioxide. During start-up, the carbon dioxide pipeline is switched to nitrogen, and during normal production, it is switched to carbon dioxide.

[0031] Preferably, the filter 2 is equipped with a differential pressure gauge.

[0032] Preferably, a flow meter is provided on the first branch.

[0033] Preferably, the carbon dioxide pipeline is equipped with a steam tracing system throughout its entire length.

[0034] Preferably, the steam tracing system covers all carbon dioxide pipelines, including the existing differential pressure gauge dead zone sections.

[0035] Preferably, a blind flange or gate valve is used for sealing. The blind flange or gate valve is equipped with an identification plate. The identification plate may indicate that the system is permanently sealed or that operation is strictly prohibited, allowing operators and maintenance personnel to quickly and accurately understand the current configuration of the system.

[0036] Preferably, the pressure of the carbon dioxide gas source 5 is 5.5-7 MPa.

[0037] Preferably, the carbon dioxide continuous tank is filled with the carbon dioxide gas source 5.

[0038] Preferably, the steam tracing system includes a steam tracing pipe, which is wound around the circumference of the carbon dioxide pipeline, and the inlet of the steam tracing pipe is connected to the outlet of the tracing station.

[0039] Preferably, the outer circumference of the steam tracing pipe is provided with a heat insulation device. The outer surface of the heat insulation device is provided with an aluminum foil reflective layer.

[0040] More preferably, an oxygen source 6 is connected to the pipeline connecting the filter 2 and the lamp 1, which is used as a combustion aid for the lamp 1.

[0041] In this embodiment, five continuously lit lamps are used. Shutting down one lamp requires 1225 Nm³ / h of medium-pressure nitrogen, with an operating time of 8000 hours per year. One ton of liquid nitrogen can produce 800 Nm³ / h of nitrogen gas, and each ton of liquid nitrogen costs 600 yuan.

[0042] Cost savings after replacing the purge gas for the continuous lamp with carbon dioxide: 1225 Nm3 / h: 800 Nm3 / h x 600 yuan x 8000h = 7.35 million yuan.

[0043] The method of using the continuous lamp blowing system in this embodiment 1 includes the following steps: 1. Preparations before startup (1) Check whether the pressure of carbon dioxide gas source 5 is stable at 5.6 MPa; (2) Confirm that the steam tracing system is operating normally and the pipeline temperature is ≥35℃; (3) Check whether the pressure difference of filter 2 is within the normal range (<0.1MPa).

[0044] 2. Normal operating procedure (1) During the operation of the always-on light Slowly open the main carbon dioxide valve; Adjust the flow meter of the first branch to the set value; Keep the second branch line open (35 Nm³ / h); The purging pressure was monitored and stabilized at 5.5-5.7 MPa.

[0045] (2) During the period when the lights are not in operation Maintain continuous operation of the carbon dioxide purging system; Monitor the purge gas flow rate using a flow meter; Regularly check the pressure differential of filter 2 and clean or replace the filter element in a timely manner.

[0046] Example 2 This embodiment 2 provides a continuous lamp purging system. Unlike embodiment 1, a heat exchanger 9, using steam as a heat source, is installed on the pipeline connecting the carbon dioxide source 5 and the purging gas main 7 to heat the introduced carbon dioxide. The heat exchanger 9 and the steam tracing system can be used individually or simultaneously. The positions and connections of the remaining components are the same as in embodiment 1.

[0047] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A continuous lamp blowing system, characterized in that, The system includes a carbon dioxide gas source (5), a continuous lamp assembly, and a purge pipeline. The continuous lamp assembly includes a continuous lamp (1), which is provided with a continuous lamp oxygen end purge point and a continuous lamp burner flame detection purge point. The purge pipeline includes a purge gas main pipe (7) leading out from the outlet of the carbon dioxide continuous tank. The purge gas main pipe (7) is provided with a filter (2). The outlet branches of the filter (2) are a first branch (11) and a second branch (12). The first branch (11) is connected to the continuous lamp oxygen end purge point, and the second branch (12) is connected to the continuous lamp burner flame detection purge point. The break (3) of the original nitrogen pipeline (41) on the first branch (11) and the second branch (12) is blocked.

2. The continuous lamp blowing system according to claim 1, characterized in that, The filter (2) is equipped with a differential pressure gauge.

3. The continuous lamp blowing system according to claim 1, characterized in that, A flow meter is installed on the first branch (11).

4. The continuous lamp blowing system according to claim 1, characterized in that, The carbon dioxide gas source (5) is equipped with a steam tracing system throughout its pipeline.

5. A continuous lamp blowing system according to claim 4, characterized in that, The steam tracing system covers all pipelines of the carbon dioxide gas source (5), including the original differential pressure gauge dead zone section.

6. A continuous lamp blowing system according to claim 4, characterized in that, The steam tracing system includes a steam tracing pipe, which is wound around the circumference of the pipeline of the carbon dioxide gas source (5), and the inlet of the steam tracing pipe is connected to the outlet of the tracing station.

7. A continuous lamp blowing system according to claim 6, characterized in that, The outer circumference of the steam tracing pipe is equipped with a heat preservation device.

8. A continuous lamp blowing system according to claim 7, characterized in that, The outer surface of the heat preservation device is provided with an aluminum foil reflective layer.

9. A continuous lamp blowing system according to claim 1, characterized in that, The break (3) of the original nitrogen pipeline (41) on the first branch (11) and the second branch (12) is sealed by a blind flange or a gate valve.

10. A continuous lamp blowing system according to claim 9, characterized in that, The blind flange or gate valve is equipped with an identification plate.

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