CN215951120U - Fuel gas supply device of heating furnace - Google Patents
Fuel gas supply device of heating furnace Download PDFInfo
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- CN215951120U CN215951120U CN202121878708.9U CN202121878708U CN215951120U CN 215951120 U CN215951120 U CN 215951120U CN 202121878708 U CN202121878708 U CN 202121878708U CN 215951120 U CN215951120 U CN 215951120U
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Abstract
The utility model discloses a fuel gas supply device of a heating furnace, which comprises a main fuel pipe connected to the heating furnace, a liquid hydrocarbon pipe connected to the main fuel pipe and a natural gas pressure regulating pipe, wherein the natural gas pressure regulating pipe is connected with a heater; a first-stage safety valve, a first-stage pressure reducing valve, a second-stage safety valve, a second-stage pressure reducing valve, a third-stage safety valve and a third-stage pressure reducing valve are sequentially arranged on the natural gas pressure regulating pipe along the direction from the heater to the heating furnace, exhaust ports of the first-stage safety valve, the second-stage safety valve and the third-stage safety valve are all connected to an exhaust pipe, and the exhaust pipe is connected to a torch air inlet pipe; the natural gas pressure regulating pipe is provided with a heat tracing pipe. In this application, utilize tertiary relief pressure valve, make the natural gas reduce pressure step by step, avoid stepping down suddenly, cause local temperature to hang down excessively, lead to the pipeline to leak. The heat tracing pipe compensates the heat energy absorbed during pressure reduction, ensures that the temperature of the natural gas is within 40 +/-5 ℃, and ensures the safe operation of the device.
Description
Technical Field
The utility model relates to a fuel gas supply device of a heating furnace.
Background
In the refining device, most of the towers need to be heated by a heating furnace, the fuel gas of the heating furnace mainly adopts a desulphurization device to produce dry gas, and a small amount of liquid hydrocarbon is doped, SO as to effectively reduce SO in the flue gas of the heating furnace2Content, the trend is to use clean natural gas as the backup fuel medium of the heating furnace. The natural gas in the pipe network is generally about 5.0MPa, can not be directly used, and needs to be reduced to 0.5MPa pressure level. In the pressure reduction process, the natural gas expands in volume to absorb heat, so that the temperature is reduced, and the pipeline is frozen. After the pipeline freezes, the valve on the pipeline and the pipeline junction easily produce the combustible gas leakage phenomenon, bring great hidden danger for the safe operation of device. When leakage is serious, the device needs to be integrally stopped to maintain the natural gas pipeline, and the stable operation of the heating device is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a fuel gas supply device for a heating furnace, which comprises a main fuel pipe connected to the heating furnace, a liquid hydrocarbon pipe connected to the main fuel pipe, and a natural gas pressure regulating pipe, wherein a heater is connected to the natural gas pressure regulating pipe, and a natural gas inlet pipe is connected to the heater; a first-stage safety valve, a first-stage pressure reducing valve, a second-stage safety valve, a second-stage pressure reducing valve, a third-stage safety valve and a third-stage pressure reducing valve are sequentially arranged on the natural gas pressure regulating pipe along the direction from the heater to the heating furnace, exhaust ports of the first-stage safety valve, the second-stage safety valve and the third-stage safety valve are all connected to an exhaust pipe, and the exhaust pipe is connected to a torch air inlet pipe; the natural gas pressure regulating pipe is provided with a heat tracing pipe. The main fuel pipe is used for conveying dry gas produced by a desulfurization device, the liquid hydrocarbon pipe is used for conveying liquid hydrocarbon, the natural gas pressure regulating pipe is used for conveying natural gas, in the conventional production, the dry gas and the liquid hydrocarbon are used as fuel gas of a heating furnace, when the supply amount of the dry gas is insufficient due to equipment adjustment or other reasons, the natural gas is used as substitute gas of the dry gas, and the natural gas and the liquid hydrocarbon are jointly used as the fuel gas.
In the application, the temperature of the natural gas is firstly increased to 50-60 ℃ by using a heater, and then the pressure is reduced. Because set up tertiary relief pressure valve, can make the natural gas reduce pressure step by step, avoid the pressure of natural gas to reduce suddenly, and lead to the local temperature to hang down excessively, cause the temperature of corresponding regional pipeline and valve to hang down excessively, cause the pipeline to leak. The heat tracing pipe is additionally arranged, so that heat energy absorbed when the natural gas is depressurized is compensated, and the temperature of the natural gas is ensured to be 40 +/-5 ℃, thereby avoiding the icing phenomenon of pipelines and valves and ensuring the safe operation of the device.
Furthermore, in order to avoid the liquid carried in the dry gas to enter into the natural gas pressure regulating pipe and influence the smooth transportation of the natural gas, the natural gas pressure regulating pipe is connected to the main fuel pipe from top to bottom.
Further, in order to adjust the safety valves and enable dry gas to uniformly descend in the natural gas pressure regulating pipe, a primary pressure detector, a secondary pressure detector and a tertiary pressure detector are further mounted on the natural gas pressure regulating pipe, wherein the primary pressure detector is located between the primary pressure reducing valve and the secondary safety valve, the secondary pressure detector is located between the secondary pressure reducing valve and the tertiary safety valve, and the tertiary pressure detector is located between the tertiary pressure reducing valve and the main fuel pipe; the primary pressure detector, the secondary pressure detector, the tertiary pressure detector, the primary valve adjusting unit, the secondary valve adjusting unit and the tertiary valve adjusting unit are all electrically connected to the central controller;
the central controller adjusts the opening degree of the primary pressure reducing valve according to the first pressure data detected by the primary pressure detector, adjusts the opening degree of the secondary pressure reducing valve according to the second pressure data detected by the secondary pressure detector, and adjusts the opening degree of the tertiary pressure reducing valve according to the third pressure data detected by the tertiary pressure detector.
After a specific production process, when the pressure value detected by the primary pressure detector is lower than a first set pressure value, the central controller can increase the opening degree of the primary pressure reducing valve, and when the pressure value detected by the primary pressure detector is higher than the first set pressure value, the central controller can decrease the opening degree of the primary pressure reducing valve. When the pressure value detected by the secondary pressure detector is lower than the second set pressure value, the central controller can increase the opening degree of the secondary pressure reducing valve, and when the pressure value detected by the secondary pressure detector is higher than the second set pressure value, the central controller can reduce the opening degree of the secondary pressure reducing valve. When the pressure value detected by the three-level pressure detector is lower than a third set pressure value, the central controller can increase the opening degree of the three-level pressure reducing valve, and when the pressure value detected by the three-level pressure detector is higher than the third set pressure value, the central controller can reduce the opening degree of the three-level pressure reducing valve.
Furthermore, the heater is a plate heater, and a high-temperature condensation water pipe and a low-pressure steam pipe are connected to a heat medium inlet of the heater. The high-temperature condensate pipe is used for connecting high-temperature condensate water with the temperature higher than 130 ℃ generated by other devices into the heater, the low-pressure steam pipe is used for connecting superheated steam with the pressure of 1.0MPa, and the design can fully utilize low-grade heat sources generated by enterprises and improve the utilization efficiency of energy.
Furthermore, in order to avoid the liquid carried in the fuel gas from entering the heating furnace and influencing the combustion effect, the main fuel pipe is connected to the heating furnace through a liquid separating tank, and the connection point of the liquid hydrocarbon pipe and the main fuel pipe and the connection point of the natural gas pressure regulating pipe and the main fuel pipe are both positioned on one side of the liquid separating tank departing from the heating furnace.
Furthermore, in order to smoothly discharge the liquid condensed out from the natural gas, a liquid discharge pipe is also installed on the natural gas pressure regulating pipe and is positioned between the three-level pressure reducing valve and the main fuel pipe.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
Referring to fig. 1, a fuel gas supply apparatus for a heating furnace includes a main fuel pipe 31 connected to a heating furnace 51, a liquid hydrocarbon pipe 41 connected to the main fuel pipe 31, and a natural gas pressure regulating pipe 22 to which a first heater 10 is connected, and a natural gas inlet pipe 21 connected to the first heater 10; the first heater 10 is a plate heater, and a high-temperature condensate pipe 12 and a low-pressure steam pipe 13 are connected to a heat medium inlet 11 of the first heater, so that low-temperature heat sources such as superheated steam of 1.0MPa and high-temperature condensate water of more than 130 ℃ generated by other devices can be connected into the first heater, and the energy utilization rate is improved. Wherein the main fuel pipe 31 is used for transporting dry gas produced by the desulfurization apparatus, the liquid hydrocarbon pipe 41 is used for transporting liquid hydrocarbon, and the natural gas pressure regulating pipe is used for transporting natural gas. A shell-side safety valve 14 is mounted on the outer shell of the first heater 10, and an exhaust port of the shell-side safety valve 14 is arranged in a straight line.
In this embodiment, the main fuel pipe 31 is connected to the heating furnace 51 through a liquid separation tank 50, and the first connection point 411 of the liquid hydrocarbon pipe 41 and the main fuel pipe 31 and the second connection point 221 of the natural gas pressure regulating pipe 22 and the main fuel pipe 31 are both located on a side of the liquid separation tank 50 away from the heating furnace 51, and the liquid carried in the fuel gas is separated by the liquid separation tank.
A primary safety valve 71, a primary pressure reducing valve 61, a secondary safety valve 72, a secondary pressure reducing valve 64, a tertiary safety valve 73 and a tertiary pressure reducing valve 67 are sequentially arranged on the natural gas pressure regulating pipe 22 along the direction from the first heater 10 to the heating furnace 51, the exhaust ports of the primary safety valve 71, the secondary safety valve 72 and the tertiary safety valve 73 are all connected to an exhaust pipe 74, and the exhaust pipe 74 is connected to a torch inlet pipe; the natural gas pressure regulating pipe is provided with a heat tracing pipe, and in the attached drawings, the heat tracing pipe is not shown and can be installed according to the prior art.
A drain pipe 23 is also attached to the natural gas pressure regulator pipe 22, and the drain pipe 23 is located between the tertiary pressure reducing valve 67 and the main fuel pipe 31. And an orifice meter 24 installed between the liquid discharge pipe 23 and the main fuel pipe 31 is installed on the natural gas pressure regulating pipe 22.
The natural gas pressure regulating pipe is also provided with a primary pressure detector 63, a secondary pressure detector 66 and a tertiary pressure detector 69, wherein the primary pressure detector 63 is positioned between the primary pressure reducing valve 61 and the secondary safety valve 72, the secondary pressure detector 66 is positioned between the secondary pressure reducing valve 64 and the tertiary safety valve 73, and the tertiary pressure detector 69 is positioned between the tertiary pressure reducing valve 67 and the main fuel pipe 31. The primary pressure reducing valve 61 is provided with a primary valve adjusting unit 62, the secondary pressure reducing valve 64 is provided with a secondary valve adjusting unit 65, the tertiary pressure reducing valve 67 is provided with a tertiary valve adjusting unit 68, and the primary pressure detector 63, the secondary pressure detector 66, the tertiary pressure detector 69, the primary valve adjusting unit 62, the secondary valve adjusting unit 65 and the tertiary valve adjusting unit 68 are all electrically connected to the central controller 100.
The central processing unit 33 adopts a 32-bit PLC programmable controller, the first-stage pressure reducing valve 61, the second-stage pressure reducing valve 64 and the third-stage pressure reducing valve 67 in the embodiment all adopt electric valves, and the valve adjusting units are arranged, and only the valve adjusting units are required to be connected to the central processing unit.
The central controller 100 adjusts the opening degree of the primary pressure reducing valve according to the first pressure data detected by the primary pressure detector, adjusts the opening degree of the secondary pressure reducing valve according to the second pressure data detected by the secondary pressure detector, and adjusts the opening degree of the tertiary pressure reducing valve according to the third pressure data detected by the tertiary pressure detector.
When the pressure value detected by the primary pressure detector is lower than the first set pressure value, the central controller can increase the opening degree of the primary pressure reducing valve 61, and when the pressure value detected by the primary pressure detector is higher than the first set pressure value, the central controller can decrease the opening degree of the primary pressure reducing valve 61.
When the pressure value detected by the secondary pressure detector is lower than the second set pressure value, the central controller can increase the opening degree of the secondary pressure reducing valve 64, and when the pressure value detected by the secondary pressure detector is higher than the second set pressure value, the central controller can decrease the opening degree of the secondary pressure reducing valve 64.
When the pressure value detected by the three-stage pressure detector is lower than the third set pressure value, the central controller can increase the opening degree of the three-stage pressure reducing valve 67, and when the pressure value detected by the three-stage pressure detector is higher than the third set pressure value, the central controller can decrease the opening degree of the three-stage pressure reducing valve 67.
In order to avoid the liquid that carries in the dry gas to enter into the natural gas pressure regulating pipe, influence the smooth transport of natural gas, in this embodiment, the natural gas pressure regulating pipe is connected to the main fuel line from top to bottom.
In order to adjust the temperature of the liquid hydrocarbon, a second heater 42 is connected in series to the liquid hydrocarbon pipe.
When the embodiment is operated, according to the content of sulfur dioxide in flue gas, a proper amount of natural gas is supplemented to serve as fuel gas, when the natural gas needs to be supplemented, 5.0MPa natural gas firstly enters the first heater 10 through the natural gas inlet pipe 21, the natural gas enters the natural gas pressure regulating pipe 22 after the heat exchange of 1.0MPa steam reaches 58 ℃, the pressure is reduced step by step, the pressure of the natural gas is reduced to 1.5MPa after passing through the first-stage pressure reducing valve, the pressure of the natural gas is reduced to 0.6MPa after passing through the second-stage pressure reducing valve, the pressure of the natural gas is reduced to 0.5MPa after passing through the third-stage pressure reducing valve, the natural gas then enters the main fuel pipe 31, and the natural gas enters the heating furnace 51 after passing through the liquid separating tank 50 to be combusted. In the pressure reduction process, the natural gas absorbs the ambient heat energy, and the heat energy absorbed by the natural gas is supplemented by the heat tracing pipe, so that the temperature of the natural gas is kept within 40 +/-5 ℃ when the natural gas enters the main fuel pipe. When the steam condensate is sufficient, the steam condensate having a temperature higher than 130 ℃ may be used as a heat source of the first heater. The liquid condensed from the natural gas is discharged by means of a drain 23.
Claims (6)
1. A fuel gas supply device of a heating furnace is characterized by comprising a main fuel pipe connected to the heating furnace, a liquid hydrocarbon pipe connected to the main fuel pipe and a natural gas pressure regulating pipe, wherein a heater is connected to the natural gas pressure regulating pipe, and a natural gas inlet pipe is connected to the heater; a first-stage safety valve, a first-stage pressure reducing valve, a second-stage safety valve, a second-stage pressure reducing valve, a third-stage safety valve and a third-stage pressure reducing valve are sequentially arranged on the natural gas pressure regulating pipe along the direction from the heater to the heating furnace, exhaust ports of the first-stage safety valve, the second-stage safety valve and the third-stage safety valve are all connected to an exhaust pipe, and the exhaust pipe is connected to a torch air inlet pipe; the natural gas pressure regulating pipe is provided with a heat tracing pipe.
2. The fuel gas supply apparatus according to claim 1, wherein the natural gas pressure regulating pipe is connected to the primary fuel pipe from the top down.
3. The fuel gas supply apparatus according to claim 1,
the natural gas pressure regulating pipe is also provided with a primary pressure detector, a secondary pressure detector and a tertiary pressure detector, wherein the primary pressure detector is positioned between the primary pressure reducing valve and the secondary safety valve, the secondary pressure detector is positioned between the secondary pressure reducing valve and the tertiary safety valve, and the tertiary pressure detector is positioned between the tertiary pressure reducing valve and the main fuel pipe; the primary pressure detector, the secondary pressure detector, the tertiary pressure detector, the primary valve adjusting unit, the secondary valve adjusting unit and the tertiary valve adjusting unit are all electrically connected to the central controller;
the central controller adjusts the opening degree of the primary pressure reducing valve according to the first pressure data detected by the primary pressure detector, adjusts the opening degree of the secondary pressure reducing valve according to the second pressure data detected by the secondary pressure detector, and adjusts the opening degree of the tertiary pressure reducing valve according to the third pressure data detected by the tertiary pressure detector.
4. The fuel gas supply apparatus according to claim 1,
the heater is a plate heater, and a high-temperature condensation water pipe and a low-pressure steam pipe are connected to a heat medium inlet of the heater.
5. The fuel gas supply apparatus according to claim 1,
the main fuel pipe is connected to the heating furnace through a liquid separating tank, and the connection point of the liquid hydrocarbon pipe and the main fuel pipe and the connection point of the natural gas pressure regulating pipe and the main fuel pipe are both positioned on one side of the liquid separating tank, which is far away from the heating furnace.
6. The fuel gas supply apparatus according to claim 1,
and a liquid discharge pipe is also arranged on the natural gas pressure regulating pipe and is positioned between the three-level pressure reducing valve and the main fuel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121878708.9U CN215951120U (en) | 2021-08-11 | 2021-08-11 | Fuel gas supply device of heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121878708.9U CN215951120U (en) | 2021-08-11 | 2021-08-11 | Fuel gas supply device of heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215951120U true CN215951120U (en) | 2022-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121878708.9U Active CN215951120U (en) | 2021-08-11 | 2021-08-11 | Fuel gas supply device of heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215951120U (en) |
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2021
- 2021-08-11 CN CN202121878708.9U patent/CN215951120U/en active Active
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