CN204358439U - A kind of fuel gas recycle device - Google Patents

Abstract

The utility model provides a kind of fuel gas recycle device, comprise fuel gas knock out drum, described fuel gas knock out drum is connected with oil product separate absorbent tower with LPG vaporizer respectively by the first pressure regulator valve group, the liquid gas that LPG vaporizer produces and the fuel gas that oil product separate absorbent tower produces, before being transported to gas equipment, first carry out buffering voltage stabilizing process through fuel gas knock out drum; Described fuel gas knock out drum top is also connected with safety valve emptying pipeline and emptying total pipeline by pneumatic pressure-regulating valve and angie type spring safety valve.The utility model is by being connected to fuel gas knock out drum by the fuel gas from oil product separate absorbent tower and the liquid gas from LPG vaporizer respectively by pipeline, by regulating pneumatic pressure-regulating valve, both ensure that the timely gas of gas equipment, the pressure stability of output fuel gas can be made again at a numerical value, be convenient to the stable of production status.

Description

A fuel gas recovery device

technical field

The utility model relates to a fuel gas recovery device.

Background technique

In the methanol-to-high-clean fuel plant, the fuel gas discharged from the top tank of the oil separation absorption tower is directly merged into the fuel gas pipeline network for ignition of the heating furnace and the torch lamp. The pressure and volume of fuel gas discharged from the current absorption tower fluctuate greatly, and the consumption of fuel gas by heating furnaces and torches is also unstable, resulting in pressure fluctuations in the fuel gas pipeline network and serious waste of fuel gas.

Utility model content

The technical problem to be solved by the utility model is that the pressure fluctuation of the fuel gas pipeline network in the existing oil separation and absorption tower is relatively large, and the fuel gas waste phenomenon is serious; in order to solve the above problems, the utility model provides a fuel gas recovery device, including fuel gas The buffer tank, the fuel gas buffer tank is respectively connected with the LPG vaporizer and the oil separation and absorption tower through the first pressure regulating valve group, the liquefied gas produced by the LPG vaporizer and the fuel gas produced by the oil separation and absorption tower are transported to the gas-consuming equipment First, buffer and stabilize the pressure through the fuel gas buffer tank; the tank top outlet of the fuel gas buffer tank is connected to the fuel gas pipeline network through the second pressure regulating valve group, and the fuel gas pipeline network is connected to each gas-consuming equipment; The top of the fuel gas buffer tank is also connected with a safety valve venting pipeline and a venting main pipeline through a pneumatic pressure regulating valve and an angle spring safety valve; the oil separation absorption tower is connected with the venting main pipeline through a third pressure regulating valve group, The third pressure regulating valve group, the angle spring safety valve and the safety valve vent pipe; the bottom of the fuel buffer tank is connected to the collection tank through the drain pipe; the outer wall of the fuel gas buffer tank is provided with a pressure gauge, temperature Gauge, liquid level instrument and pressure regulator; the third pressure regulating valve group is provided with a pressure control unit, and the pressure control unit performs pressure regulation through the pressure signal fed back by the pressure regulator.

Preferably, both the second pressure regulating valve group and the third pressure regulating valve group include self-operated pressure regulating valves and flanged ball valves.

Preferably, the first pressure regulating valve group includes flanged ball valves, flanged check valves and flanged gate valves.

The beneficial effects of the utility model are as follows: 1. By connecting the fuel gas from the oil separation and absorption tower and the liquefied gas from the LPG vaporizer to the fuel gas buffer tank respectively through pipelines, and by adjusting the pneumatic pressure regulating valve, the gas consumption is guaranteed. The timely use of gas by the equipment can stabilize the pressure of the output fuel gas at a certain value, which is convenient for the stability of production conditions; 2. Since the output pressure of the gas set by the LPG vaporizer process is lower than the operating pressure set value of the fuel gas buffer tank, However, the pressure of the fuel gas output from the oil separation and absorption tower is higher than the operating pressure of the fuel gas buffer tank. Therefore, when the pressure of the buffer tank exceeds the output gas pressure set by the LPG vaporizer process, the LPG vaporizer will automatically stop running and no longer output liquefied gas. It can only use the fuel gas output from the oil separation and absorption tower, saving a lot of liquefied gas. When the pressure of the buffer tank is lower than the pressure of the LPG vaporizer, the LPG vaporizer and the oil separation and absorption tower work at the same time, ensuring the normal operation of gas equipment 3. Due to the addition of a fuel gas buffer tank, additional fuel gas can be stored for use by the device, which can play an emergency role and avoid the waste of fuel gas.

Description of drawings

Fig. 1 is the connection structure schematic diagram of the present utility model;

In the figure, 1. Fuel gas buffer tank; 2. LPG vaporizer; 3. Oil separation and absorption tower; 4. Second pressure regulating valve group; 5. Third pressure regulating valve group; 6. Fuel gas pipeline network; 7. Safety Valve vent pipe; 8. Vent main pipe; 9. Collection tank; 10. Flange gate valve; 11. Pressure gauge; 12. Temperature gauge; 13. Liquid level instrument; 14. Pressure control unit; 15. Pressure regulator; 16 , Angle spring safety valve; 17, flange ball valve; 18, flange check valve.

detailed description

Below in conjunction with accompanying drawing, the technical solution of the utility model is further described.

As shown in Figure 1, a kind of fuel gas recovery device of the present utility model comprises fuel gas buffer tank 1, LPG vaporizer 2 and oil product separation and absorption tower 3, and fuel gas buffer tank 1 is connected with LPG respectively through the first pressure regulating valve group. The vaporizer 2 is connected to the oil separation and absorption tower 3. The liquefied gas produced by the LPG vaporizer and the fuel gas produced by the oil separation and absorption tower are buffered and stabilized through the fuel gas buffer tank before being sent to the gas-consuming equipment; The tank top outlet of the tank 1 is connected to the fuel gas pipe network 6 through the second pressure regulating valve group 4, and the fuel gas pipe network 6 is connected to each gas-consuming equipment; It is connected with a safety valve vent pipe 7 and a vent main pipe 8. The safety pressure of the safety valve is 0.8MPa to prevent damage to the equipment pipe due to excessive pressure of the fuel gas system; the oil separation and absorption tower 3 passes through the third pressure regulating valve group 5 It is connected with the venting main pipeline 8, and is also connected with the safety valve venting pipe 7 through the third pressure regulating valve group 5 and the angle spring safety valve 16; the angle spring safety valve 16 automatically takes off when the pressure of the tank exceeds the set value, preventing Explosion caused by excessive pressure; the bottom of the fuel gas buffer tank 1 is connected to the collecting tank 9 through the drain pipe, and the flange ball valve 17 is arranged on the drain pipe; the outer wall of the fuel gas buffer tank 1 is connected with a pressure gauge through the flange gate valve 10 11. Temperature gauge 12, liquid level gauge 13 and pressure regulator 15; the third pressure regulating valve group 5 is provided with a pressure control unit 14, and the pressure control unit 14 performs pressure regulation through the pressure signal fed back by the pressure regulator 15. Two flanged gate valves 10 are also connected to the outer wall of the fuel gas buffer tank for emergency treatment.

Both the second pressure regulating valve group 4 and the third pressure regulating valve group 5 include self-operated pressure regulating valves and flanged ball valves 17 .

The first pressure regulating valve group includes a flanged ball valve 17, a flanged check valve 18 and a flanged gate valve 10. The flanged check valve 18 can prevent backflow of liquid or gas, and the flanged gate valve 10 can realize rapid shutoff.

In the actual work of the utility model, when the methanol-made high-clean fuel device regenerates the catalyst, it is necessary to run the catalyst regeneration heating furnace. At this time, the fuel gas with a pressure of 1.0 MPa ~ 1.4 MPa from the oil separation and absorption tower and the fuel gas from the LPG vaporizer The 0.4MPa liquefied gas enters the fuel gas buffer tank at the same time. According to the pressure of the fuel gas buffer tank displayed by the pressure gauge, the operator adjusts the pneumatic pressure regulating valve installed on the fuel gas inlet pipeline to control the amount of fuel gas venting, so that the fuel gas buffer The internal pressure of the tank is stabilized between 0.5MPa and 0.6MPa, and then the fuel gas passes through the self-operated pressure regulating valve on the fuel gas outlet pipeline on the top of the buffer tank to reduce the pressure of the fuel gas to 0.35MPa and then merges into the fuel gas pipeline network and is transported to each The gas equipment not only ensures the timely gas consumption of each gas equipment, but also stabilizes the production conditions. When the pressure of the fuel gas buffer tank 1 exceeds 0.4MPa, the LPG carburetor will automatically stop working under the action of the first pressure regulating valve group, and no longer output liquefied gas. At this time, the fuel gas system will completely use the oil separation and absorption tower to generate The by-product fuel gas is delivered to the fuel gas buffer tank through the pressure control unit of the second pressure regulating valve group. The operator needs to regularly open the drain valve set at the bottom of the fuel gas buffer tank to discharge the waste liquid into the collection tank, so as to prevent the accumulation of flammable liquid or impurities from being brought into the fuel gas pipe network and cause damage to the burner of the heating furnace or torch. The hydrocarbons and other useful components are collected and separated and purified again.

The fuel gas recovery device of the present utility model, according to the production scale of 200,000 tons/year methanol-based high-clean fuel, the catalyst regeneration time of the three reactors is about 3000 hours each year, and the average consumption of fuel gas per hour is about 150Nm ³ , if using 10 Liquefied gas in RMB/Nm ³ costs RMB 4.5 million per year; if the fuel gas that is emptied after oil separation is used, it is waste utilization and does not require any additional costs, which can save a lot of fuel costs.

In the above description, many specific details are set forth in order to fully understand the utility model. However, the above description is only a preferred embodiment of the utility model, and the utility model can be implemented in many other ways different from those described here, so the utility model is not limited by the specific implementation disclosed above. At the same time, any person skilled in the art can use the methods and technical content disclosed above to make many possible changes and modifications to the technical solution of the present utility model without departing from the scope of the technical solution of the utility model, or modify it into an equivalent change, etc. effective example. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, which do not deviate from the technical solution of the present utility model, still belong to the scope of protection of the technical solution of the present utility model.

Claims (3)

1. A fuel gas recovery device, characterized in that it comprises a fuel gas buffer tank, the fuel gas buffer tank is respectively connected to the LPG vaporizer and the oil separation absorption tower through the first pressure regulating valve group, and the liquefied gas produced by the LPG vaporizer The fuel gas produced by the oil separation and absorption tower is firstly buffered and stabilized through the fuel gas buffer tank before being sent to the gas-consuming equipment; the outlet of the fuel gas buffer tank top passes through the second pressure regulating valve group and the fuel gas pipeline network The fuel gas pipeline network is connected to each gas-consuming equipment; the top of the fuel gas buffer tank is connected to a safety valve venting pipeline and a venting main pipeline through a pneumatic pressure regulating valve and an angle spring safety valve; the oil separation and absorption The tower is connected to the main venting pipeline through the third pressure regulating valve group, and is also connected to the venting pipe of the safety valve through the third pressure regulating valve group and the angle spring safety valve; the bottom of the fuel buffer tank is connected to the collecting tank; the outer wall of the fuel gas buffer tank is provided with a pressure gauge, a temperature gauge, a liquid level gauge and a pressure regulator; a pressure control unit is provided on the third pressure regulating valve group, and the pressure control unit passes the pressure The pressure signal fed back by the regulator is used for pressure regulation. 2. A fuel gas recovery device according to claim 1, wherein the second pressure regulating valve group and the third pressure regulating valve group both include self-operated pressure regulating valves and flanged ball valves. 3 . The fuel gas recovery device according to claim 1 , wherein the first pressure regulating valve group includes a flanged ball valve, a flanged check valve and a flanged gate valve. 4 .