A gasification raw coal gas safety relief system

Abstract

The application provides a gasification crude coal gas safety relief system, relates to the technical field of gasification crude coal gas, and comprises a crude coal gas pipeline, a first gas guide valve and a second gas guide valve are arranged in parallel on the crude coal gas pipeline, two sides of the second gas guide valve are connected with relief branch pipes, the two relief branch pipes are connected with a relief main pipe, the relief main pipe is connected with a fire cabinet pipeline, and a valve assembly is arranged on the relief branch pipe, the crude coal gas can be organizedly discharged to the fire cabinet through the relief branch pipe, the relief main pipe and the valve assembly, compared with the in-situ discharge mode of the prior art, the crude coal gas can be safely guided to the fire cabinet for combustion, the leakage and gathering of toxic and harmful gas and the injection of high-temperature gas under pressure are avoided, the life safety of workers is effectively protected, the operation risk is reduced, the safe and stable operation of the gasification device is maintained, the number of shutdown and maintenance of the gasification device due to safety problems is reduced, and the operation efficiency and reliability of the gasification device are improved.

Description

Technical Field

[0001] This application relates to the field of gasification crude gas technology, and more specifically, to a safe venting system for gasification crude gas. Background Technology

[0002] Currently, gate valves are commonly used as gas guide valves at the outlet of gasification units. However, these valves are prone to internal leakage during long-term operation due to factors such as wear on the sealing surface and deformation of the valve stem. Before disassembling and reassembling the process gas blind flange of the backup system, due to existing limitations, it is usually only possible to open the root valve of the local pressure gauge to handle the leakage.

[0003] However, this on-site discharge method has significant drawbacks: when the leakage of the gas guide valve is serious, it is difficult to completely release the system pressure to atmospheric pressure by relying solely on the root valve of the local pressure gauge. Under such circumstances, when the process gas blind flange is disassembled or installed, the residual pressurized high-temperature process gas is easy to be ejected, which can easily cause burns to the workers. At the same time, the gasified crude coal gas contains toxic and harmful gases such as carbon monoxide and hydrogen sulfide. The accumulation of leaked toxic gases may cause workers to be poisoned and suffocated, seriously threatening the lives of the workers and posing a great hidden danger to the safe and stable operation of the gasification unit. Summary of the Invention

[0004] The purpose of this application is to provide a safe gasification crude gas release system that can solve the technical problems raised in the background art.

[0005] This application provides a gasification crude gas safety release system, including a crude gas pipeline. A first gas guide valve and a second gas guide valve are connected in parallel on the crude gas pipeline. Both sides of the second gas guide valve are connected to release branch pipes on the crude gas pipeline. Both release branch pipes are connected to a release main pipe. The release main pipe is connected to a fire cabinet pipeline. Valve assemblies are provided on the release branch pipes.

[0006] Furthermore, the valve assembly includes a pre-vent gate valve and a vent figure-eight blind flange, which are sequentially arranged on the vent branch pipe along the gas flow direction.

[0007] Furthermore, a discharge gate valve is provided on the discharge main pipe.

[0008] Furthermore, each of the two discharge branches is connected to a detection tube, and the detection tube is sequentially equipped with a first gate valve, a pressure sensor, a backflow valve, and a second gate valve.

[0009] Furthermore, both of the aforementioned detection tubes are connected to the flushing water pipeline.

[0010] Furthermore, the first air valve is an electric gate valve, and the second air valve is a manual gate valve.

[0011] The beneficial effects of this utility model are:

[0012] This invention, through a venting branch pipe, a venting main pipe, and a valve assembly, can systematically discharge crude gas into the combustion chamber. Compared with the existing technology of on-site discharge, it can safely guide leaked crude gas into the combustion chamber for combustion, avoiding the leakage and accumulation of toxic and harmful gases and the injection of pressurized high-temperature gas. This effectively protects the lives of operators, reduces operational risks, helps maintain the safe and stable operation of the gasification unit, reduces the number of gasification unit shutdowns and maintenance due to safety issues, and improves the operating efficiency and reliability of the gasification unit. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a process system diagram of some embodiments of this application;

[0015] The reference numerals in the attached figures are as follows:

[0016] 1. Coarse gas pipeline; 2. First gas pilot valve; 3. Second gas pilot valve; 4. Relief branch pipe; 5. Relief main pipe; 6. Fire cabinet pipeline; 7. Valve assembly; 71. Relief pre-gate valve; 72. Relief figure-eight blind flange; 8. Relief post-gate valve; 9. Detection pipe; 10. First gate valve; 11. Pressure sensor; 12. Backflow valve; 13. Second gate valve; 14. Flushing water pipeline. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0024] like Figure 1As shown, this application provides a safety venting system for gasified crude gas, including a crude gas pipeline 1. A first gas-guiding valve 2 and a second gas-guiding valve 3 are connected in parallel on the crude gas pipeline 1. Venting branch pipes 4 are connected to both sides of the second gas-guiding valve 3 on the crude gas pipeline 1. Both venting branch pipes 4 are connected to a venting main pipe 5, which is connected to a fire cabinet pipeline 6. Valve assemblies 7 are provided on the venting branch pipes 4. When the gasification unit is operating normally, the first gas-guiding valve 2 is open and the second gas-guiding valve 3 is closed. The gas in the crude gas pipeline 1 is transported through the first gas-guiding valve 2. At this time, the valve assembly 7 on the venting branch pipe 4 is in the closed state, and the system is operating normally. The second gas-guiding valve 3 is a standby valve. When the first gas-guiding valve 2 leaks internally and the process gas blind plate of the standby system needs to be disassembled, the system can be operated by relying solely on the local... If the pressure gauge root valve cannot completely release the system pressure to atmospheric pressure, the valve assembly 7 on the venting branch pipes 4 on both sides of the second gas guide valve 3 can be opened. Since both venting branch pipes 4 are connected to the venting main pipe 5, and the venting main pipe 5 is connected to the fire cabinet pipeline 6, the leaked crude gas will be guided to the fire cabinet for combustion through the venting branch pipes 4 and the venting main pipe 5, thereby reducing the system pressure. Compared with the existing technology of on-site discharge, the leaked crude gas can be safely guided to the fire cabinet for combustion, avoiding the leakage and accumulation of toxic and harmful gases and the injection of pressurized high-temperature gas, effectively protecting the lives of operators, reducing operational risks, helping to maintain the safe and stable operation of the gasification unit, reducing the number of gasification unit shutdowns and maintenance due to safety issues, and improving the operating efficiency and reliability of the gasification unit.

[0025] like Figure 1 As shown, valve assembly 7 includes a pre-venting gate valve 71 and a venting figure-eight blind flange 72. The pre-venting gate valve 71 and the venting figure-eight blind flange 72 are sequentially arranged on the venting branch pipe 4 along the gas flow direction. When the gasification crude gas safety venting system is operating normally and venting is not required, the pre-venting gate valve 71 is in the closed state, preventing crude gas from entering the venting branch pipe 4 and ensuring that the gas in the system flows normally in the crude gas pipeline 1. When a situation requiring venting occurs in the crude gas pipeline 1 (such as internal leakage in the first gas pilot valve 2), the pre-venting gate valve 71 is opened first. With the release figure-eight blind flange 72, the crude gas enters the release main pipe 5 through the release branch pipe 4, and is then guided to the fire cabinet pipeline 6 for combustion treatment, achieving safe release. When performing maintenance or repair operations on the release branch pipe 4 and the release main pipe 5, first close the release gate valve 71 to cut off the passage of crude gas into the release branch pipe 4, and then adjust the state of the release figure-eight blind flange 72 as needed to completely isolate the release branch pipe 4 from the crude gas pipeline 1, prevent gas leakage during maintenance, and provide a safe working environment for maintenance personnel.

[0026] like Figure 1As shown, a post-venting gate valve 8 is installed on the main venting pipe 5. When a venting operation is required, the pre-venting gate valve 71 on the venting branch pipe 4 is opened and the blind flange of the venting valve 8 is adjusted to ensure unobstructed passage. Then, the post-venting gate valve 8 is opened, allowing the crude gas to flow from the crude gas pipeline 1 through the venting branch pipe 4 and the main venting pipe 5 to the fire cabinet pipeline 6 for combustion treatment, thus achieving safe venting. The post-venting gate valve 8 provides an additional control link for the venting process. When it is necessary to slowly release pressure, the post-venting gate valve 8 can be slightly opened first, and the opening degree can be gradually adjusted according to the changes in system pressure to avoid the impact of a sudden pressure drop on the system. When the system is operating normally, the closed post-venting gate valve 8 acts as an additional barrier, increasing the system's sealing and reducing the risk of gas leakage.

[0027] like Figure 1 As shown, each of the two venting branch pipes 4 is connected to a detection pipe 9. The detection pipe 9 is equipped with a first gate valve 10, a pressure sensor 11, a backflow valve 12, and a second gate valve 13 in sequence. When the gasification crude gas safety venting system is operating normally and the venting branch pipe 4 is not venting, the first gate valve 10 and the second gate valve 13 are in the closed state. At this time, the pressure sensor 11 is isolated from the crude gas in the venting branch pipe 4 and will not be affected by the gas pressure. The pressure value displayed by the pressure sensor 11 is zero or in the initial state, and the backflow valve 12 is also in the closed state. When pressure relief is required, the operator first opens the first gate valve 10 to allow the crude gas to enter the detection pipe 9. At this time, the pressure sensor 11 begins to sense the pressure in the pipe and converts the pressure signal into an electrical signal for display. Specifically, the pressure sensor 11 is a single-flange pressure transmitter (Rosemount). The pressure sensor 11 monitors the venting pressure in real time and allows for direct observation of the pressure venting situation.

[0028] like Figure 1 As shown, both detection pipes 9 are connected to the flushing water pipeline 14. In order to prevent the pressure sensor 11 from becoming clogged, the probe of the pressure sensor 11 needs to be flushed after use. During flushing, the second gate valve 13 and the first gate valve 10 are opened, and the water from the flushing water pipeline 14 flows into the detection pipe 9 to flush the probe of the pressure sensor 11. The flushed water enters the crude gas pipeline 1 and mixes with the crude gas, and is transported with the crude gas. After flushing is completed, the second gate valve 13 and the first gate valve 10 are closed.

[0029] like Figure 1As shown, the first gas pilot valve 2 is an electric gate valve, and the second gas pilot valve 3 is a manual gate valve. The electric gate valve is suitable for remote control and automated production processes. It can quickly and accurately adjust the valve opening according to the real-time operation of the system to control the flow of gasified crude gas, which is beneficial to improving production efficiency and product quality. The manual gate valve provides a reliable operating method for on-site debugging, maintenance, and special circumstances (such as switching to the manual gate valve when the electric gate valve fails). It is convenient for operators to operate directly on-site without being affected by electrical system failures. The second gas pilot valve 3 is a backup valve, which is manual instead of electric, thus saving certain costs.

[0030] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A safety venting system for gasified crude coal gas, comprising a crude coal gas pipeline, wherein a first gas pilot valve and a second gas pilot valve are connected in parallel on the crude coal gas pipeline, characterized in that: The front and rear sides of the second gas valve are connected to the crude gas pipeline with venting branch pipes. Both venting branch pipes are connected to the venting main pipe, which is connected to the fire cabinet pipeline. Valve assemblies are provided on the venting branch pipes.

2. The gasification crude gas safety venting system according to claim 1, characterized in that: The valve assembly includes a pre-vent gate valve and a vent figure-eight blind flange, which are sequentially arranged on the vent branch pipe along the gas flow direction.

3. The gasification crude gas safety venting system according to claim 2, characterized in that: The main discharge pipe is equipped with a discharge gate valve.

4. The gasification crude gas safety venting system according to claim 1, characterized in that: Each of the two discharge branch pipes is connected to a detection pipe, and the detection pipe is equipped with a first gate valve, a pressure sensor, a backflow valve and a second gate valve in sequence.

5. A safe venting system for gasified crude coal gas according to claim 4, characterized in that: Both of the aforementioned detection tubes are connected to the flushing water line.

6. The gasification crude gas safety venting system according to claim 1, characterized in that: The first air valve is an electric gate valve, and the second air valve is a manual gate valve.

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