Fuel gas supply system of heating furnace

Abstract

The utility model relates to a heating furnace of an aromatic hydrocarbon benzene preparation device, in particular to a fuel gas supply system of the heating furnace, which belongs to the field of petrochemical engineering and comprises a liquid separation tank, the heating furnace and a fuel gas output header pipe. The fuel gas output header pipe is connected to an inlet of the liquid separation tank, the top of the liquid separation tank is connected to a fuel gas collecting pipe through a fuel gas delivery pipeline, and the fuel gas collecting pipe is connected with a plurality of heating furnaces through fuel gas branch pipelines; the bottom of the liquid separation tank is connected with a liquid drainage pipeline of the liquid separation tank, and a liquid level meter for displaying the liquid level in the tank is arranged in the liquid separation tank; the liquid separation tank is connected with a liquid separation tank exhaust pipeline, the liquid separation tank exhaust pipeline is connected to a torch system, and a pressure gauge for displaying the pressure in the tank is arranged in the liquid separation tank. According to the fuel gas supply system of the heating furnace, the fuel gas produced by each device is subjected to liquid separation through the liquid separation tank before entering the fuel gas collecting pipe, so that the liquid carried by the fuel gas is effectively reduced, the heat efficiency of the heating furnace is improved, and meanwhile, the purposes of energy conservation and efficiency improvement are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to aromatic hydrocarbon preparation benzene device heating furnace, concretely is a kind of heating furnace fuel gas supply system, belong to petrochemical field. BACKGROUND

[0002] Heating furnace is a kind of heating equipment very important in petrochemical production, fuel usually has fuel gas, fuel oil, if fuel gas carries liquid not only will cause fuel gas combustion incomplete energy consumption increase, seriously possibly will cause corrosion, even leakage causes fire. When the load of each fuel gas device is larger, the amount of fuel gas generated is larger, especially in winter, the amount of fuel gas is large, in winter, low temperature is more likely to cause fuel gas to carry liquid, affect heating furnace combustion thermal efficiency. UTILITARY MODEL

[0003] According to the defects of the above prior art, the purpose of the utility model is to provide a heating furnace fuel gas supply system, which effectively reduces the liquid carrying condition of fuel gas, and is more beneficial to the use of heating furnace using fuel gas as fuel in winter.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows: a heating furnace fuel gas supply system, comprising a liquid separation tank, a heating furnace and a fuel gas production header; the fuel gas production header is connected to the inlet of the liquid separation tank, the top of the liquid separation tank is connected to the fuel gas collecting pipe through a fuel gas external delivery pipeline, and the fuel gas collecting pipe is connected to a plurality of heating furnaces through a plurality of fuel gas branch pipelines; the bottom of the liquid separation tank is connected to a liquid separation tank liquid discharge pipeline, and a liquid level meter for displaying the liquid level in the tank is arranged in the liquid separation tank; the liquid separation tank is connected to a liquid separation tank exhaust pipeline, and the liquid separation tank exhaust pipeline is connected to a flare system; a pressure gauge for displaying the pressure in the tank is arranged in the liquid separation tank.

[0005] Further, the top of the liquid separation tank is provided with a venting pipeline, and a venting valve is arranged on the venting pipeline.

[0006] Further, a safety valve group is arranged on the liquid separation tank exhaust pipeline.

[0007] Further, the liquid separation tank is connected with a low-pressure steam tracing pipeline for tracing the liquid separation tank.

[0008] Further, the medium in the low-pressure steam tracing pipeline is 1.0MPa low-pressure steam.

[0009] Further, the liquid level meter is a remote liquid level meter, and the pressure gauge is a remote pressure gauge.

[0010] Further, each fuel gas production device connects the produced fuel gas to the production device distribution tank of each device for primary distribution, and the outlet of the production device distribution tank of each device is connected to the fuel gas production main pipe, which is connected to the distribution tank through the fuel gas production main pipe for secondary distribution.

[0011] Further, each fuel gas production device connects the produced fuel gas to the production device distribution tank of each device for primary distribution, and the outlet of the production device distribution tank of each device is connected to the fuel gas production main pipe, which is connected to the distribution tank through the fuel gas production main pipe for secondary distribution.

[0012] Further, a flow control valve group is arranged on each fuel gas branch pipe, and a shock soot blower is arranged on each fuel gas branch pipe before the heating furnace tail inlet to remove soot accumulated at the heating furnace tail, and a heating furnace venting pipe is arranged at the heating furnace tail inlet, and the heating furnace venting pipe is vented at a high point.

[0013] Further, the distribution tank drainage pipe is connected to the close-packed system.

[0014] The heating furnace fuel gas supply system of the utility model divides the fuel gas produced by each device through the distribution tank before the fuel gas enters the fuel gas collecting pipe, effectively reduces the liquid carried by the fuel gas, increases the heating furnace thermal efficiency, and achieves the purpose of energy saving and efficiency increasing. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the heating furnace fuel gas supply system of the utility model;

[0016] In the figure: 1, distribution tank, 2, fuel gas production main pipe, 3, fuel gas delivery pipe, 4, distribution tank drainage pipe, 5, remote liquid level meter, 6, distribution tank exhaust pipe, 7, safety valve group, 8, venting pipe, 9, venting valve, 10, remote pressure gauge, 11, low-pressure steam heat tracing pipe, 12, fuel gas collecting pipe, 13, heating furnace, 14, shock soot blower, 15, heating furnace venting pipe, 16, fuel gas production main pipe outlet valve;

[0017] OD, open drainage system, AD, close-packed system. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and understandable, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0019] Referring to the drawings Figure 1 A heating furnace fuel gas supply system, comprising a distribution tank 1, a heating furnace and a fuel gas production main pipe 2; each fuel gas production device produces fuel gas, which is first distributed by a production device distribution tank, then connected and collected by a pipeline to the fuel gas production main pipe 2, the end outlet of the fuel gas production main pipe 2 is connected to the inlet of the distribution tank 1 for secondary distribution by the distribution tank 1, a fuel gas production main pipe outlet valve 16 is arranged at the outlet of the fuel gas production main pipe 2, the top of the distribution tank 1 is connected to a fuel gas collecting pipe 12 through a fuel gas delivery pipeline 3, the fuel gas collecting pipe 12 is connected to a plurality of heating furnaces 13 through a plurality of fuel gas branch pipelines, thereby providing fuel gas for the heating furnaces; the bottom of the distribution tank 1 is connected to a distribution tank drainage pipeline 4, which is connected to a close-packed system, a remote liquid level gauge 5 is arranged in the distribution tank 1 to display the liquid level in the tank; the top of the distribution tank 1 is connected to a distribution tank exhaust pipeline 6, which is connected to a flare system, a safety valve group 7 is arranged on the distribution tank exhaust pipeline 6; a remote pressure gauge 10 is arranged in the distribution tank 1 to display the pressure in the tank. The distribution tank 1 performs secondary liquid removal before the fuel gas enters the fuel gas collecting pipe 12, effectively reducing the liquid carried by the fuel gas, providing a better environment for fuel gas combustion, and at the same time increasing the thermal efficiency of the heating furnace and saving energy.

[0020] Further, an emptying pipeline 8 is arranged at the top of the distribution tank, and an emptying valve 9 is arranged on the emptying pipeline.

[0021] Further, a low-pressure steam tracing pipeline 11 is connected to the distribution tank 1 for tracing of the distribution tank. The medium in the low-pressure steam tracing pipeline 11 is 1.0MPa low-pressure steam.

[0022] Further, a flow control valve group is arranged on each fuel gas branch pipeline; a shock wave soot blower 14 is arranged before the tail inlet of the corresponding heating furnace 13 to remove soot accumulated at the tail of the heating furnace 13; a heating furnace emptying pipeline 15 is arranged at the tail inlet of the heating furnace 13.

[0023] In the original design pipeline, fuel gas enters the fuel gas collecting pipe 12 directly, and is sent to several heating furnace users from the collecting pipe for flow control combustion. By setting a distribution tank 1 in front of the fuel gas collecting pipe 12, fuel gas enters the distribution tank 1 and is sent to the collecting pipe through the fuel gas delivery pipeline 3. If liquid phase is formed, it will be stored in the distribution tank 1. The liquid level is displayed by the remote liquid level meter 5. When the liquid level reaches a certain height, the liquid is discharged through the distribution tank liquid discharge pipeline for the liquid discharge operation. Each time the discharge needs to reserve 1%-2% of the liquid level of the distribution tank 1 to prevent pressure from being connected to the liquid discharge system. When the pressure of the remote pressure gauge 10 in the distribution tank is relatively high (the normal pressure control is 0.4MPa, and the safety valve trip pressure is designed to be 0.55MPa), the pressure is discharged to the flare system through the distribution tank gas discharge pipeline 6 and the safety valve group 7 to ensure the safe operation of the distribution tank 1. After entering winter, the low-pressure steam heating pipeline 11 is used in time, and the distribution tank 1 is heated by the 1.0MPa low-pressure steam system to reduce the amount of liquid in the distribution tank 1, ensure the combustion of fuel gas, increase the efficiency of the heating furnace, and save energy and increase efficiency.

[0024] It should be noted that the part not described in detail in the utility model is prior art.

[0025] The terms "first", "second", "third", etc. are used only for the purpose of description and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can be explicitly or implicitly included at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0026] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through intermediate media. Moreover, the first feature "on", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or just indicate that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or just indicate that the first feature is less than the second feature in horizontal height.

[0028] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0029] The above is only the best embodiment of the present application. Obviously, the present application is not limited to the above embodiments, and there can be many variations. All variations that can be directly derived or inferred from the disclosed content by those of ordinary skill in the art should be considered within the scope of the present application.

Claims

1. A fuel gas supply system for a heating furnace, characterized in that: The system includes a liquid separator, a heating furnace, and a fuel gas output main. The fuel gas output main is connected to the inlet of the liquid separator. The top of the liquid separator is connected to a fuel gas manifold via a fuel gas delivery pipeline. The fuel gas manifold is connected to several heating furnaces via various fuel gas branch pipelines. The bottom of the liquid separator is connected to a liquid separator drain pipeline. A level gauge is installed inside the liquid separator to display the liquid level. The liquid separator is connected to a liquid separator exhaust pipeline, which is connected to a flare system. A pressure gauge is installed inside the liquid separator to display the pressure inside the tank.

2. The fuel gas supply system for a heating furnace according to claim 1, characterized in that: The top of the separator is equipped with a vent line, and a vent valve is installed on the vent line.

3. The fuel gas supply system for a heating furnace according to claim 1, characterized in that: A safety valve assembly is installed on the exhaust pipe of the separator.

4. The fuel gas supply system for a heating furnace according to claim 1, characterized in that: The separator is connected to a low-pressure steam tracing pipeline for heat tracing.

5. A fuel gas supply system for a heating furnace according to claim 4, characterized in that: The medium inside the low-pressure steam tracing pipeline is 1.0 MPa low-pressure steam.

6. A fuel gas supply system for a heating furnace according to claim 1, characterized in that: The level gauge is a remote level gauge; the pressure gauge is a remote pressure gauge.

7. A fuel gas supply system for a heating furnace according to any one of claims 1-6, characterized in that: Each fuel gas producing device connects and collects the produced fuel gas through pipelines to the fuel gas producing main pipe, and the end outlet of the fuel gas producing main pipe is connected to the inlet of the separator.

8. A fuel gas supply system for a heating furnace according to claim 7, characterized in that: Each fuel gas producing unit connects the produced fuel gas to the liquid separator of its own producing unit for primary liquid separation. The outlet of the liquid separator of each producing unit is connected to the fuel gas producing main pipe, which in turn connects to the liquid separator for secondary liquid separation.

9. A fuel gas supply system for a heating furnace according to any one of claims 1-6, characterized in that: Each fuel gas branch pipeline is equipped with a flow control valve assembly; each fuel gas branch pipeline is equipped with a shock wave soot blower before the inlet at the tail end of the heating furnace to remove accumulated ash at the tail end of the heating furnace; a heating furnace vent pipeline is installed at the inlet at the tail end of the heating furnace.

10. A fuel gas supply system for a heating furnace according to any one of claims 1-6, characterized in that: The liquid drain line of the separator is connected to the dense packing system.

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