Emergency system for fuel gas flame arrester of heating furnace

Abstract

The utility model relates to a heating furnace fuel gas flame arrester emergency system which comprises a heating furnace, the lower portion of the heating furnace is connected with a parallel type flame arrester flow path through a pipeline, and the lower portion of the parallel type flame arrester flow path is connected with two fuel gas systems. The two sets of fuel gas systems are bidirectionally arranged, are converged through respective fuel gas pipelines and are in flow connection with the parallel flame arrester; a crossover line is led out of one set of fuel gas system to be connected to a pipeline at the bottom of the heating furnace, and the crossover line is provided with a flame arrester which is the same as the flow of the parallel flame arrester; a new fuel gas process is added on the basis of the original process of the flame arrester; when the original flow of the flame arrester goes wrong, the original flow of the flame arrester is isolated, and a new fuel gas flow is put into use; the reformed heating furnace does not need to be shut down independently for cleaning the flame arrester, long-term operation of the heating furnace can be achieved, and a damaged valve is replaced after the device is planned to be shut down.

Description

Technical Field

[0001] This utility model relates to the modification of the flame arrestor method of a heating furnace, specifically to an emergency system for a fuel gas flame arrestor for a heating furnace. Background Technology

[0002] In the xylene unit of the aromatics plant, the heater is supplied with fuel gas through two fuel gas systems. A parallel flame arrester, with one in standby mode, is installed between the fuel gas systems and the heater. Due to the high pressure differential caused by fuel gas crystallization, the flame arrester needs to be cleaned regularly to prevent blockage.

[0003] Each flame arrester is equipped with isolation valves at both ends. When the valve at the front end of one of the flame arresters is damaged and cannot be closed for isolation, the flame arrester cannot be isolated for maintenance and clearing, resulting in the other flame arrester operating alone. However, when the other flame arrester has a high pressure differential and cannot operate, the heating furnace must be shut down for shutdown, resulting in production losses. Utility Model Content

[0004] In view of the technical problems existing in the design of the flame arrestor structure of the above-mentioned heating furnace, the purpose of this utility model is to provide an emergency system for the fuel gas flame arrestor of the heating furnace, which modifies the design and structure of the flame arrestor, making emergency flame arrest more convenient and eliminating the need for the heating furnace to be shut down.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an emergency system for a fuel gas flame arrester in a heating furnace, comprising: a heating furnace, wherein a parallel flame arrester process is connected to the bottom of the heating furnace via a pipeline, and the parallel flame arrester process is connected to two fuel gas systems below; the two fuel gas systems are bidirectional and converge through their respective fuel gas pipelines and are connected to the parallel flame arrester process; a crossover line is led out from one of the fuel gas systems and connected to a pipeline at the bottom of the heating furnace, wherein the crossover line is equipped with the same flame arrester as in the parallel flame arrester process;

[0006] Furthermore, a new fuel gas flow is formed for the entire system by coordinating the cross-line with the flame arrester on the cross-line, while the parallel flame arrester flow is the original flame arrester flow of the system.

[0007] Furthermore, the bottom of the heating furnace is provided with several burners, each of which is equipped with a metal flexible hose. One end of each metal flexible hose is connected to the burner of the heating furnace, and the other end is connected to the parallel flame arrester process through a pipeline, and a furnace front hand valve is provided on the pipeline.

[0008] Furthermore, the parallel flame arrester process includes: two parallel first flame arresters and second flame arresters, each with a front valve and a rear valve installed on the pipelines before and after it.

[0009] Furthermore, the two fuel gas systems are a fuel gas system and a sulfur-containing fuel gas system, respectively; the fuel gas system includes a first fuel gas pipeline, which is equipped with a first solenoid valve and a first pneumatic regulating valve; the sulfur-containing fuel gas system includes a second fuel gas pipeline, which is equipped with a second solenoid valve and a second pneumatic regulating valve; the first fuel gas pipeline and the second fuel gas pipeline converge together and are connected to the pipeline connecting the first flame arrester and the second flame arrester;

[0010] Furthermore, the new fuel gas process includes: a cross-line, a third flame arrester, valves before and after the third flame arrester, and an electric shut-off valve; one end of the cross-line is connected to the pipeline behind the furnace front manual valve via a branch pipeline, and the other end of the cross-line is connected between the second solenoid valve and the second pneumatic regulating valve on the second fuel gas pipeline; valves before and after the third flame arrester are respectively provided on the cross-line located before and after the third flame arrester, and the electric shut-off valve is located on the cross-line closer to the second fuel gas pipeline;

[0011] Furthermore, the electric shut-off valve on the cross-line is equipped with an interlock signal; when the heating furnace is interlocked, the electric shut-off valve is forced to close.

[0012] Furthermore, gate valves are installed on the cross-line branch pipelines, and control valves are installed at the rear end of each furnace front hand valve. Each branch pipeline is connected to the pipeline between the control valve and the furnace front hand valve located below each metal hose via a tee.

[0013] With the above-mentioned flame arrestor design, when a valve of one of the flame arrestors in the original flame arrestor process is damaged, it is not necessary to shut down the furnace, put into operation the new fuel gas process, and isolate the original flame arrestor process. Ultimately, the purpose of one flame arrestor in the original flame arrestor process and the third flame arrestor in the new fuel gas process can be achieved. In this way, the furnace can be operated for a long time without shutdown, and the damaged valve can be replaced after the unit is scheduled to be shut down.

[0014] The beneficial effects of this utility model's emergency system for a heater fuel gas flame arrestor are:

[0015] Based on the original process of the flame arrester, a new fuel gas process is added; when the original process of the flame arrester has a problem, the original flame arrester process is isolated and the new fuel gas process is put into use; after the modification, the heating furnace does not need to be shut down separately to clean the flame arrester, and the heating furnace can be operated for a long time. The damaged valves are replaced when the unit is scheduled to be shut down. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present invention.

[0017] In the diagram, 1. Heating furnace, 2. Burner, 3. Metal hose, 4. Furnace front hand valve, 5. First flame arrester, 6. Second flame arrester, 7. First fuel gas line, 8. First solenoid valve, 9. First pneumatic regulating valve, 10. Second fuel gas line, 11. Second solenoid valve, 12. Second pneumatic regulating valve, 13. Crossover line, 14. Third flame arrester, 15. Third flame arrester front valve, 16. Third flame arrester rear valve, 17. Electric shut-off valve, 18. Gate valve, 19. First flame arrester front valve, 20. Control valve, 21. Second flame arrester front valve, 22. Second flame arrester rear valve. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0019] like Figure 1 As shown, an emergency system for a fuel gas flame arrester in a heating furnace includes: a heating furnace 1, with a parallel flame arrester process connected to the bottom of the heating furnace 1 via a pipeline, and two fuel gas systems connected to the bottom of the parallel flame arrester process; the two fuel gas systems are bidirectional and converge through their respective fuel gas pipelines and are connected to the parallel flame arrester process; a crossover line 13 is led out from one of the fuel gas systems and connected to a pipeline at the bottom of the heating furnace 1, and the crossover line 13 is equipped with the same flame arrester as in the parallel flame arrester process;

[0020] Furthermore, a new fuel gas flow is formed for the entire system by using the cross line 13 in conjunction with the flame arrester on the cross line 13, while the parallel flame arrester flow is the original flame arrester flow of the system.

[0021] Furthermore, the bottom of the heating furnace 1 is provided with several burners 2, each of which is equipped with a metal flexible hose 3. One end of each metal flexible hose 3 is connected to the burner 2 of the heating furnace, and the other end is connected to the parallel flame arrester process through a pipeline. A furnace front hand valve 4 is provided on the pipeline.

[0022] Furthermore, the parallel flame arrester process includes: two parallel first flame arresters 5 and second flame arresters 6, with a front valve 19 and a rear valve installed on the pipelines before and after each flame arrester.

[0023] Furthermore, the two fuel gas systems are a fuel gas system and a sulfur-containing fuel gas system, respectively; the fuel gas system includes a first fuel gas pipeline 7, which is equipped with a first solenoid valve 8 and a first pneumatic regulating valve 9; the sulfur-containing fuel gas system includes a second fuel gas pipeline 10, which is equipped with a second solenoid valve 11 and a second pneumatic regulating valve 12; the first fuel gas pipeline 7 and the second fuel gas pipeline 10 converge together and are connected to the pipeline connecting the first flame arrester 5 and the second flame arrester 6.

[0024] Furthermore, the new fuel gas process includes: a cross-line 13, a third flame arrester 14, valves (15, 16) before and after the third flame arrester, and an electric shut-off valve 17; one end of the cross-line 13 is connected to the pipeline behind the furnace front hand valve 4 via a branch pipeline, and the other end of the cross-line 13 is connected between the second solenoid valve 11 and the second pneumatic regulating valve 12 on the second fuel gas pipeline 10; valves (15, 16) before and after the third flame arrester 14 are respectively provided on the cross-line 13, and the electric shut-off valve 17 is located on the cross-line 13 in the direction close to the second fuel gas pipeline 10;

[0025] Furthermore, the electric shut-off valve 17 on the cross line 13 is equipped with an interlock signal; when the heating furnace 1 is interlocked, the electric shut-off valve 17 is forced to close.

[0026] Gate valves 18 are installed on the branch pipelines of the cross line 13 respectively, and control valves 20 are installed at the rear end of each furnace front hand valve 4. Each branch pipeline is connected to the pipeline between the control valve 20 and the furnace front hand valve 4 located below each metal hose 3 through a tee. The above design can realize the free switching between the new fuel gas process and the original flame arrester process.

[0027] It should be noted that this embodiment specifically demonstrates the connection between the two branch pipelines in front and the two sets of burner processes. The burner processes under several other heating furnaces are omitted in the figure by omitting three points.

[0028] With the above-mentioned flame arrestor design, when the front valve 19 of the first flame arrestor in the original flame arrestor process is damaged, the first flame arrestor 5 cannot isolate the flame. However, it is not necessary to shut down the furnace and put the new fuel gas process into operation to isolate the original flame arrestor process. In the end, the second flame arrestor 6 in the original flame arrestor process and the third flame arrestor 14 in the new fuel gas process are used as a backup. The furnace can be operated for a long time, and the front valve 19 of the first flame arrestor can be replaced after the unit is scheduled to be shut down.

[0029] The specific operation of the above-mentioned new fuel gas process is as follows:

[0030] Open the front valve 15 of the third flame arrester, the rear valve 16 of the third flame arrester, and several gate valves 18; open the electric shut-off valve 17; then open the second solenoid valve 11 and the second pneumatic regulating valve 12; slowly close the front valve 21 of the second flame arrester and the rear valve 22 of the second flame arrester, isolate the second flame arrester 6, depressurize, and clean up after the cooking is qualified. Then, set up the second flame arrester 6 for standby.

[0031] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] The above-listed embodiments are merely preferred embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. An emergency system for a fuel gas flame arrestor in a heating furnace, characterized in that, include: The heating furnace is connected to a parallel flame arrester process via pipelines below it, and the parallel flame arrester process is connected to two fuel gas systems below it. The two fuel gas systems are bidirectional and converge through their respective fuel gas pipelines, connecting to the parallel flame arrester process. A cross line is led out from one of the fuel gas systems and connected to the pipeline at the bottom of the heating furnace. The cross line is equipped with the same flame arrester as in the parallel flame arrester process.

2. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 1, characterized in that: The new fuel gas flow of the entire system is formed by the cross-line and the flame arrester on the cross-line, while the parallel flame arrester flow is the original flame arrester flow of the system.

3. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 1, characterized in that: The heating furnace is equipped with several burners at the bottom, and each burner is equipped with a metal flexible hose. One end of each metal flexible hose is connected to the burner of the heating furnace, and the other end is connected to the parallel flame arrester process through a pipeline. A furnace front hand valve is installed on the pipeline.

4. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 1, characterized in that: The parallel flame arrester process includes: two parallel first flame arresters and second flame arresters, each with a front valve and a rear valve on the pipelines before and after it.

5. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 1, characterized in that: The two fuel gas systems are a fuel gas system and a sulfur-containing fuel gas system. The fuel gas system includes a first fuel gas pipeline, which is equipped with a first solenoid valve and a first pneumatic regulating valve. The sulfur-containing fuel gas system includes a second fuel gas pipeline, which is equipped with a second solenoid valve and a second pneumatic regulating valve. The first fuel gas pipeline and the second fuel gas pipeline converge and are connected to the pipeline connecting the first flame arrester and the second flame arrester.

6. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 2, characterized in that: The new fuel gas process includes: a cross-line, a third flame arrester, valves before and after the third flame arrester, and an electric shut-off valve; one end of the cross-line is connected to the pipeline behind the furnace front manual valve via a branch line, and the other end of the cross-line is connected between the second solenoid valve and the second pneumatic regulating valve on the second fuel gas pipeline; valves before and after the third flame arrester are respectively provided on the cross-line located before and after the third flame arrester, and the electric shut-off valve is located on the cross-line closer to the second fuel gas pipeline.

7. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 6, characterized in that: The electrically operated shut-off valve across the line is equipped with an interlock signal.

8. The emergency system for a fuel gas flame arrestor in a heating furnace according to claim 6, characterized in that: Gate valves are installed on the cross-line branch pipelines, and control valves are installed at the rear end of each furnace front hand valve. Each branch pipeline is connected to the pipeline between the control valve and the furnace front hand valve located below each metal hose via a tee.

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