Fire retardant device capable of being flushed on line

Abstract

The utility model discloses an on-line flushable fire-retardant device which comprises a fire arrester, a fuel gas incoming pipeline is connected with one ends of a first valve and a second valve, the other end of the first valve is connected with one end of a third valve and the inlet end of the first fire arrester, and the other end of the second valve is connected with one end of a fourth valve and the inlet end of the second fire arrester. The other ends of the third and fourth valves are connected with an emptying pipeline; the outlet end of the first flame arrester is connected with one ends of a fifth valve and a sixth valve, the outlet end of the second flame arrester is connected with one ends of a seventh valve and an eighth valve, and the other ends of the fifth valve and the seventh valve are connected with a steam incoming pipeline; the other ends of the sixth and eighth valves are connected with a fuel gas port pipeline of the heating furnace; and pressure gauges are arranged on the fuel gas incoming pipeline and the heating furnace fuel gas port pipeline. The structure that the pressure gauges are arranged at the inlet end and the outlet end of the flame arrester is adopted, whether the flame arrester is blocked or not can be accurately judged, online reverse flushing and cleaning can be conducted on the flame arrester, environmental pollution caused by cleaning after the flame arrester is opened is reduced, the labor intensity of workers is reduced, and production is facilitated.

Description

Technical Field

[0001] The utility model relates to a fuel gas fire arrester for a heating furnace in the petrochemical industry, in particular to an online flushable fire arrester. Background Art

[0002] In the petrochemical industry, heating furnace fuel gas systems are all designed with flame arrester systems. Typically, one flame arrester is used in operation, while the other is used as a backup. Flame arresters are flange-connected. If the active flame arrester becomes clogged, it must be switched to the backup flame arrester on-site, and the clogged flame arrester must be removed and flushed. This operation is not only time-consuming and labor-intensive, but also easily causes environmental pollution and is complex for technicians, hindering production. Summary of the Invention

[0003] The purpose of the utility model is to provide an online flushable fire arresting device to address the defects of the prior art.

[0004] Its technical solution is: an online flushable fire arrester device, including a flame arrester, a valve and a pressure gauge, the fuel gas pipeline is connected to one end of the first valve and one end of the second valve, the other end of the first valve is connected to one end of the third valve and the input end of the first flame arrester, the other end of the second valve is connected to one end of the fourth valve and the input end of the second flame arrester, the other end of the third valve and the other end of the fourth valve are both connected to the vent pipeline; the output end of the first flame arrester is connected to one end of the fifth valve and one end of the sixth valve, the output end of the second flame arrester is connected to one end of the seventh valve and one end of the eighth valve, the other end of the fifth valve and the other end of the seventh valve are both connected to the steam pipeline; the other end of the sixth valve and the other end of the eighth valve are both connected to the fuel gas outlet pipeline of the heating furnace; a first pressure gauge is provided on the fuel gas pipeline, and a second pressure gauge is provided on the fuel gas outlet pipeline of the heating furnace.

[0005] Furthermore, the first to eighth valves are all manual valves; the first pressure gauge and the second pressure gauge are both mechanical pressure gauges.

[0006] Furthermore, the first to eighth valves are all electrically controlled valves; the first pressure gauge and the second pressure gauge are both pressure transmitters; the first pressure gauge and the second pressure gauge are respectively connected to the input end of the programmable controller, and the first to eighth valves are respectively connected to the output end of the programmable controller and are controlled by it.

[0007] Compared with the prior art, the utility model has the following advantages: reasonable design, simple structure, and easy production. It adopts a structure in which pressure gauges are respectively provided at both ends of the inlet and outlet of the flame arrester, which can accurately judge whether the flame arrester is blocked and can implement online backwash cleaning for the blocked flame arrester. On the one hand, it reduces the environmental pollution caused by cleaning after the flame arrester is opened. On the other hand, it reduces the labor intensity of workers, is flexible in operation, can also realize automatic monitoring and automatic cleaning, facilitates the operation of technicians, is beneficial to production, and can be widely used in fuel gas systems of chemical plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a structural diagram of an embodiment of the utility model;

[0009] Figure 2 It is a circuit block diagram of another embodiment of the utility model. DETAILED DESCRIPTION

[0010] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0011] Example 1: Reference Figure 1 , an online flushable fire arrester device, comprising a flame arrester, a valve and a pressure gauge, characterized in that: a fuel gas pipeline 1 is connected to one end of a first valve 3 and one end of a second valve 8, the other end of the first valve 3 is connected to one end of a third valve 4 and an input end of a first flame arrester 5, the other end of the second valve 8 is connected to one end of a fourth valve 7 and an input end of a second flame arrester 9, the other end of the third valve 4 and the other end of the fourth valve 7 are both connected to a vent line 6; the output end of the first flame arrester 5 is connected to one end of a fifth valve 13 and one end of a sixth valve 14, the output end of the second flame arrester 9 is connected to one end of a seventh valve 11 and one end of an eighth valve 10, the other end of the fifth valve 13 and the other end of the seventh valve 11 are both connected to a steam pipeline 12; the other end of the sixth valve 14 and the other end of the eighth valve 10 are both connected to a heating furnace fuel gas inlet pipeline 16; a first pressure gauge 2 is provided on the fuel gas pipeline 1, and a second pressure gauge 15 is provided on the heating furnace fuel gas inlet pipeline 16.

[0012] The first to eighth valves are all manual valves; the first pressure gauge and the second pressure gauge are both mechanical pressure gauges.

[0013] During operation, the first flame arrester 5 operates while the second flame arrester 9 is in standby. First, the first valve 3 and the sixth valve 14 are opened, while all other valves are closed. Fuel gas from the fuel gas supply line 1 then flows sequentially through the first valve 3, the first flame arrester 5, the sixth valve 14, and the heating furnace fuel gas inlet line 16 into the heating furnace, operating with the first flame arrester 5. The first pressure gauge 2 and the second pressure gauge 15 monitor the pressures at the front and rear ends of the first flame arrester 5 respectively. Whether the first flame arrester 5 is blocked can be judged by the pressures displayed by the two pressure gauges. When the pressure difference displayed by the two pressure gauges is large, it means that the first flame arrester 5 is blocked; at this time, the first valve 3 and the sixth valve 14 can be closed, and the second valve 8 and the eighth valve 10 can be opened. The fuel gas from the fuel gas pipeline 1 enters the heating furnace through the second valve 8, the second flame arrester 9, the eighth valve 10 and the heating furnace fuel gas inlet pipeline 16 in sequence, and works by using the second flame arrester 9; at the same time, the third valve 4 and the fifth valve 13 are opened, and the steam in the steam pipeline 12 enters the outlet of the first flame arrester 5 through the fifth valve 13 for backflushing. The steam and the fuel attached to the first flame arrester 5 that are backflushed out of the first flame arrester 5 are discharged from the inlet of the first flame arrester 5 and the third valve 4 to the vent pipeline 6 for external discharge or recovery. After a certain period of backflushing, the third valve 4 and the fifth valve 13 are closed, and the first flame arrester 5 enters the standby state.

[0014] Example 2: Reference Figure 1 — Figure 2 , an online flushable fire arrester device, comprising a flame arrester, a valve and a pressure gauge, characterized in that: a fuel gas pipeline 1 is connected to one end of a first valve 3 and one end of a second valve 8, the other end of the first valve 3 is connected to one end of a third valve 4 and an input end of a first flame arrester 5, the other end of the second valve 8 is connected to one end of a fourth valve 7 and an input end of a second flame arrester 9, the other end of the third valve 4 and the other end of the fourth valve 7 are both connected to a vent line 6; the output end of the first flame arrester 5 is connected to one end of a fifth valve 13 and one end of a sixth valve 14, the output end of the second flame arrester 9 is connected to one end of a seventh valve 11 and one end of an eighth valve 10, the other end of the fifth valve 13 and the other end of the seventh valve 11 are both connected to a steam pipeline 12; the other end of the sixth valve 14 and the other end of the eighth valve 10 are both connected to a heating furnace fuel gas inlet pipeline 16; a first pressure gauge 2 is provided on the fuel gas pipeline 1, and a second pressure gauge 15 is provided on the heating furnace fuel gas inlet pipeline 16.

[0015] The first to eighth valves are all electrically controlled valves; the first pressure gauge 2 and the second pressure gauge 15 are both pressure transmitters; the first pressure gauge 2 and the second pressure gauge 15 are respectively connected to the input end of the programmable controller PLC, and the first to eighth valves are respectively connected to the output end of the programmable controller PLC and are controlled by it.

[0016] When in use, first set the programmable controller PLC to read the pressure difference value between the first pressure gauge 2 and the second pressure gauge 15 and compare them, and set the pressure value of the second pressure gauge 15 to three-quarters, two-thirds or one-half of the pressure value of the first pressure gauge 2 as the switching point.

[0017] During initial operation, first flame arrester 5 operates, while second flame arrester 9 stands by. The programmable controller (PLC) controls the opening of first valve 3 and sixth valve 14, while all other valves are closed. Fuel gas from fuel gas inlet line 1 then flows sequentially through first valve 3, first flame arrester 5, sixth valve 14, and furnace fuel gas inlet line 16 into the heating furnace, operating with first flame arrester 5.

[0018] The first pressure gauge 2 and the second pressure gauge 15 monitor the pressures at the front and rear ends of the first flame arrester 5 respectively. The pressure difference monitored by the two pressure gauges can be used to determine whether the first flame arrester 5 is blocked. When the pressure difference between the two pressure gauges is large, it means that the first flame arrester 5 is blocked. At this time, the programmable controller PLC controls the closing of the first valve 3 and the sixth valve 14, and the opening of the second valve 8 and the eighth valve 10. The fuel gas from the fuel gas pipeline 1 passes through the second valve 8, the second flame arrester 9, the eighth valve 10 and the heating furnace fuel gas inlet pipeline 16 in sequence and enters the heating furnace. The second flame arrester 9 is used to control the first valve 3 and the sixth valve 14. At the same time, the programmable controller PLC controls the opening of the third valve 4 and the fifth valve 13, and the steam in the steam line 12 enters the outlet of the first flame arrester 5 through the fifth valve 13 for recoil, and the steam recoiled out of the first flame arrester 5 and the fuel attached thereto are discharged from the inlet of the first flame arrester 5 and the third valve 4 to the vent line 6 for external discharge or recovery. After a certain period of recoil, the third valve 4 and the fifth valve 13 are closed, and the first flame arrester 5 enters the standby state. The programmable controller PLC only maintains the second valve 8 and the eighth valve 10 open, and all other valves are closed.

[0019] When a large pressure difference appears between the two pressure gauges here, it means that the second flame arrester 9 is blocked; at this time, the programmable controller PLC controls the closing of the second valve 8 and the eighth valve 10, and the opening of the first valve 3 and the sixth valve 14. The fuel gas from the fuel gas pipeline 1 enters the heating furnace through the first valve 3, the first flame arrester 5, the sixth valve 14 and the heating furnace fuel gas inlet pipeline 16 in sequence, and rotates to use the first flame arrester 5 for work again; at the same time, the programmable controller PLC controls the opening of the fourth valve 7 and the seventh valve 11, and the steam in the steam pipeline 12 enters the outlet of the second flame arrester 9 through the seventh valve 11 for backflushing. The steam and the fuel attached to the second flame arrester 9 are backflushed out from the inlet of the second flame arrester 9 and the fourth valve 7 and discharged to the vent pipeline 6 for external discharge or recovery. After a certain period of backflushing, the fourth valve 7 and the seventh valve 11 are closed, and the second flame arrester 9 enters the standby state. The programmable controller PLC only maintains the second valve 8 and the eighth valve 10 open, and all other valves are closed.

[0020] This embodiment can realize automatic control. The programmable controller PLC and electric control valve are both mature products of existing technology and can be purchased directly.

[0021] The utility model has a reasonable design, a simple structure and is easy to manufacture. It adopts a structure for respectively monitoring the pressure at both ends of the inlet and outlet of the flame arrester, can accurately judge whether the flame arrester is blocked, and can implement online backwash cleaning for the blocked flame arrester. On the one hand, it reduces the environmental pollution caused by cleaning after the flame arrester is opened, and on the other hand, it reduces the labor intensity of workers. It is flexible in operation and can also realize automatic monitoring and automatic cleaning, which is convenient for the operation of technicians and is beneficial to production. It can be widely used in fuel gas systems of chemical plants.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An online flushable fire arrester device, comprising a flame arrester, a valve and a pressure gauge, characterized in that: The fuel gas pipeline is connected to one end of the first valve and one end of the second valve, the other end of the first valve is connected to one end of the third valve and the input end of the first flame arrester, the other end of the second valve is connected to one end of the fourth valve and the input end of the second flame arrester, and the other end of the third valve and the other end of the fourth valve are both connected to the vent pipeline; the output end of the first flame arrester is connected to one end of the fifth valve and one end of the sixth valve, the output end of the second flame arrester is connected to one end of the seventh valve and one end of the eighth valve, and the other end of the fifth valve and the other end of the seventh valve are both connected to the steam pipeline; the other end of the sixth valve and the other end of the eighth valve are both connected to the fuel gas inlet pipeline of the heating furnace; a first pressure gauge is provided on the fuel gas pipeline, and a second pressure gauge is provided on the fuel gas inlet pipeline of the heating furnace.

2. The online flushable fire arrester according to claim 1, characterized in that: The first to eighth valves are all manual valves; the first pressure gauge and the second pressure gauge are both mechanical pressure gauges.

3. The online flushable fire arrester according to claim 1, characterized in that: The first to eighth valves are all electrically controlled valves; the first pressure gauge and the second pressure gauge are both pressure transmitters; the first pressure gauge and the second pressure gauge are respectively connected to the input end of the programmable controller, and the first to eighth valves are respectively connected to the output end of the programmable controller and are controlled by it.

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