CN212298564U - Fuel gas system for treating high-oxygen-content tail gas - Google Patents
Fuel gas system for treating high-oxygen-content tail gas Download PDFInfo
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- CN212298564U CN212298564U CN202020948970.5U CN202020948970U CN212298564U CN 212298564 U CN212298564 U CN 212298564U CN 202020948970 U CN202020948970 U CN 202020948970U CN 212298564 U CN212298564 U CN 212298564U
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Abstract
The utility model discloses a fuel gas system for treating high oxygen-containing tail gas, which comprises a two-stage pressure operation system, namely a first system and a second system; the front end of the first system is provided with a natural gas introduction control device, and the natural gas introduction control device is used for regulating and controlling natural gas introduced outside a boundary region; the tail end of the first system is connected with the front end of the second system, a pressure regulating valve a is arranged between the tail end of the first system and the front end of the second system, and the pressure regulating valve a regulates the pressure of the first system to be higher than that of the second system; the first system is provided with a plurality of air supply pipelines connected to ethylene oxide and ethylene glycol devices; the second system is provided with a plurality of gas supply pipelines and a plurality of tail gas discharge pipelines for receiving tail gas of the ethylene oxide and ethylene glycol device, and the second system is also provided with a safety release device. The utility model has the advantages of reducing the environmental protection investment, efficiently recycling the high oxygen-containing tail gas, saving the production cost, improving the production benefit, etc.
Description
Technical Field
The utility model relates to a fuel gas system for handling high oxygen-containing tail gas belongs to the chemical industry equipment field.
Background
At present, the domestic ethylene production devices mainly use naphtha or coal-made olefin, and large-scale devices for preparing ethylene by using light hydrocarbon ethane as a raw material do not realize production operation. In large light hydrocarbon combined devices, an ethylene oxide and ethylene glycol device is an important component. In the process of producing ethylene oxide and ethylene glycol, raw materials of ethylene and oxygen are adopted to generate ethylene oxide through catalytic oxidation of a silver catalyst under the conditions of high temperature and high pressure, and reaction gas is returned to a reaction system for recycling through a recycle gas compressor after ethylene oxide is recovered through lean absorption liquid. Because the raw material oxygen contains inert gas argon which does not participate in the ethylene oxidation reaction, the inert gas argon is always accumulated in a process circulating gas system, if the argon is excessively accumulated in the process circulating gas, the combustion limit of the oxidation reaction gas can be reduced, and difficulty and danger are brought to operation, so that the process circulating gas emptying system is provided in the ethylene glycol production process. The recycle vent gas is dominated by ethylene and methane, but also has an oxygen content as high as 10% and cannot be fed directly to a discharge system, such as a flare. According to the requirements of SH3009-2013 petrochemical combustible gas emission system design specifications, the combustible gas with the oxygen content of more than 2% (volume fraction) is not discharged into a whole plant combustible gas emission system, and is discharged into a special emission system or is treated separately.
At present, the tail gas of ethylene oxide and ethylene glycol devices is directly sent to open fire equipment such as an incinerator for incineration. The method has many disadvantages, not only increases the investment cost of the incinerator by tens of millions, but also wastes light fuel in the exhaust tail gas, and the economic value is greatly reduced.
The light hydrocarbon comprehensive processing and utilizing device comprises a plurality of sets of ethane cracking ethylene preparing devices and a plurality of sets of ethylene oxide and ethylene glycol devices, a boiler and other fuel gas users, and the hydrogen content of the byproduct fuel gas of the ethane cracking ethylene preparing devices is extremely high, and the byproduct fuel gas mainly flows to PSA to prepare high-purity hydrogen, so that the fuel gas amount supplemented to a fuel gas system by the ethylene devices is less. The comprehensive processing and utilizing device introduces a large amount of natural gas from the outside of the device as fuel, and is mainly used for a steam boiler and an ethane cracking furnace.
Disclosure of Invention
The utility model discloses the main objective is, solves among the light hydrocarbon integrated processing utilized device, and ethylene oxide and the high oxygen content tail gas of ethylene glycol device go to difficult problem, has avoided on the one hand directly discharging the high oxygen content tail gas to burning the required equipment investment of burning furnace, and on the other hand can also fully retrieve the calorific value of the high oxygen content tail gas of discharging in ethylene oxide and the ethylene glycol device, for the increase economic benefits of enterprise.
The utility model provides a technical scheme that technical problem adopted is: a fuel gas system for treating tail gas with high oxygen content mainly comprises a two-stage pressure operation system, namely a first system and a second system; the front end of the first system is provided with a natural gas introduction control device, and the natural gas introduction control device is used for regulating and controlling natural gas introduced outside a boundary region; the tail end of the first system is connected with the front end of the second system, a pressure regulating valve a is arranged between the tail end of the first system and the front end of the second system, and the pressure regulating valve a regulates the pressure of the first system to be larger than that of the second system; the first system is provided with a plurality of air supply pipelines connected to ethylene oxide and ethylene glycol devices; the second system is provided with a plurality of gas supply pipelines and a plurality of tail gas discharge pipelines for receiving the high oxygen-containing tail gas of the ethylene oxide and ethylene glycol device, and the second system is also provided with a safety release device.
Further, the natural gas introducing control device comprises a valve p, a flow meter, a valve n, a valve m, a valve q and a valve r; the valve p and the valve n are normally open valves, the valve m is a pressure regulating valve, the valve q is a pressure relief valve, and the valve r is a bypass valve.
Further, the safety release device comprises a first safety valve, a second safety valve, a valve h, a valve i, a valve j and a valve k; the valve i and the valve j are normally open valves, the valve k is a normally closed valve, and the valve h is a safety relief valve.
Furthermore, in the second system, the ratio of the total supply amount of the natural gas to the input amount of the high oxygen-containing tail gas is equal to or larger than 13.3.
Further, the pressure value in the first system is 0.2-0.3 MPa higher than the pressure value in the second system.
Further, the total volume of the pipeline of the second system is more than or equal to 800M3。
Further, the gas supply pipeline on the second system is connected to one or a combination of more than two of an overhead torch, a ground torch, a torch liquid separation tank, a boiler or an ethane cracking device.
Furthermore, the farthest end of the tail end of the first system is provided with a double valve, the farthest ends of the two ends of the second system are provided with double valves, and the double valves are reserved for newly added users.
The fuel gas system for treating the high oxygen content tail gas works as follows:
the front end of the first system introduces natural gas into the first system from the outside of a boundary area through a valve p, a flowmeter, a valve n and a valve m, a plurality of sets of ethylene oxide and ethylene glycol devices in the light hydrocarbon comprehensive processing and utilizing device respectively introduce the natural gas from an air supply pipeline of the first system, and the farthest end of a main pipeline of the first system is provided with two pipeline end valves (a valve b and a valve c) and is provided with a blind plate to reserve for a new device in the future.
The second system, which is lower in pressure than the first system, supplies natural gas to users other than the ethylene oxide and glycol plants, is connected by a pressure regulating valve a provided at the end of the first system, and controls the downstream pressure. The users of the second system are provided with more than or equal to two million-ton/year ethane cracking ethylene-making devices, more than or equal to two sets of boilers, and users such as ground torches, overhead torches and the like. And a safety release device is arranged on a pipeline main pipe of the second system and consists of a first safety valve, a second safety valve, a valve h, a valve i, a valve j, a valve k, a pressure sensor and a controller. The design pressure of the first safety valve and the second safety valve is 0.79Mpa, and the valve h sets the linkage upper limit of 0.42Mpa and the linkage lower limit of 0.35 Mpa.
During normal operation, the natural gas is introduced into the control device from the natural gas to control the pressure to be 0.6 +/-0.1 Mpa, and the natural gas is stably conveyed to a plurality of sets of ethylene oxide and glycol devices. The high oxygen content tail gas of the ethylene oxide and ethylene glycol device is led out to a second system through a tail gas discharge pipeline. The high oxygen content tail gas comprises the following components: the content of oxygen is 10-11 vt.%, the content of methane is 49.5-51 vt.%, the content of ethylene is 23-24 vt.%, the content of argon is 11.5-13.8 vt.%, and the rest is nitrogen, carbon dioxide and the like. The flow fluctuation of the high oxygen content tail gas emission is transmitted to a second system, and the pressure is balanced by a pressure regulating valve a. The pressure regulating valve a sets the automatic control parameter to be 0.4 +/-0.1 Mpa to ensure the pressure stability of the second system, and the second system continuously supplies gas to a plurality of sets of boilers, a plurality of sets of ethane cracking ethylene preparing devices, a torch and other users through gas supply pipelines. When the pressure on the second system exceeds 0.42Mpa, the valve h automatically opens for pressure relief, when the pressure is reduced to 0.35Mpa, the valve h automatically closes, if the valve h can not meet the normal pressure relief capacity, and when the system continuously boosts to 0.5Mpa, the first safety valve and the second safety valve can be opened for pressure relief, so that the safety of the system is ensured.
The utility model has the advantages that: compared with the prior art, the utility model provides a fuel gas system has the advantage that reduces the environmental protection investment, but the oxygen-containing tail gas of high-efficient recycle ethylene oxide and ethylene glycol device saves enterprise's fuel gas expense. The system can safely and stably receive the high-oxygen-content tail gas from the ethylene oxide and ethylene glycol device, and the tail gas is conveyed to a user for use after being treated; by recycling the high oxygen-containing tail gas, the expense of billions of yuan of natural gas can be saved for enterprises every year; by recycling the high oxygen-containing tail gas, the design treatment capacity of the whole plant waste gas incinerator is reduced, and the equipment investment is reduced by thousands of yuan.
Drawings
Fig. 1 is a schematic structural diagram of a fuel gas system provided by the present invention.
Fig. 2 is a schematic structural view of the safety release device in fig. 1.
Fig. 3 is a schematic structural view of the natural gas introduction control device in fig. 1.
Wherein, 1-natural gas is introduced into the control device; 2-a first system; 3-a tail gas discharge pipeline; 4-ethylene oxide and ethylene glycol plants; 5-air supply pipeline; 6-pressure regulating valve a; 7-valve b; 8-valve c; 9-valve d; 10-valve e; 11-a second system; 12-a safety release device; 13-valve f; 14-valve g; 15-gas supply pipeline; 16-ground torch; 17-a torch liquid separation tank; 18-a boiler; a 19-ethane cracking unit; 20-elevated torch; 21-a first safety valve; 22-a second safety valve; 23-valve h; 24-a valve i; 25-valve j; 26-valve k; 27-valve m; 28-valve n; 29-a flow meter; 30-a valve p; 31-valve q; 32-valve r.
Detailed Description
The invention is further illustrated by the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, a fuel gas system for treating a tail gas with high oxygen content mainly comprises a two-stage pressure operation system, namely a first system 2 and a second system 11; the front end of the first system 2 is provided with a natural gas introduction control device 1, and the natural gas introduction control device 1 is used for regulating and controlling natural gas introduced outside a boundary region; the tail end of the first system 2 is connected with the front end of the second system 11, a pressure regulating valve a 6 is arranged between the tail end of the first system 2 and the front end of the second system 11, and the pressure of the first system 2 is regulated and controlled by the pressure regulating valve a 6 to be larger than that of the second system 11; a plurality of air supply pipelines 5 connected to an ethylene oxide and ethylene glycol device 4 are arranged on the first system 2; the second system 11 is provided with a plurality of gas supply pipelines 15 and a plurality of tail gas discharge pipelines 3 for receiving the high oxygen-containing tail gas of the ethylene oxide and ethylene glycol device 4, and the second system 11 is also provided with a safety release device 12.
The natural gas introducing control device 1 comprises a valve p 30, a flow meter 29, a valve n 28, a valve m 27, a valve q 31 and a valve r 32; the valve p 30 and the valve n 28 are normally open valves, the valve m 27 is a pressure regulating valve, the valve q 31 is a pressure relief valve, and the valve r 32 is a bypass valve.
The safety release device 12 comprises a first safety valve 21, a second safety valve 22, a valve h 23, a valve i 24, a valve j 25 and a valve k 26; the valve i 24 and the valve j 25 are normally open valves, the valve k 26 is a normally closed valve, and the valve h 23 is a safety relief valve.
In the second system 11, the ratio of the total supply amount of the natural gas to the input amount of the high oxygen-containing tail gas is equal to or larger than 13.3.
The pressure value in the first system 2 is 0.2-0.3 MPa higher than the pressure value in the second system 11.
The pipes of the second system 11The total volume is more than or equal to 800M3。
The gas supply line 15 on the second system 11 is connected to one or a combination of two or more of a flare 20, a ground flare 16, a flare knock-out drum 17, a boiler 18, or an ethane cracker 19.
The most distal end in the end of first system 2 is equipped with double valve, the most distal end in both ends of second system 11 all is equipped with double valve, double valve reserves for newly-increased user.
The fuel gas system for treating the high oxygen content tail gas works as follows:
the front end of the first system 2 introduces natural gas into the first system 2 from the outside of a boundary area through a valve p 30, a flowmeter 29, a valve n 28 and a valve m 27, a plurality of sets of ethylene oxide and ethylene glycol devices 4 in the light hydrocarbon comprehensive processing and utilizing device respectively introduce the natural gas from an air supply pipeline 5 of the first system 2, and the farthest end of a main pipeline of the first system 2 is provided with two pipeline end valves (a valve b 7 and a valve c 8) and is provided with a blind plate to reserve for a new device in the future. The second system 11, which is lower in pressure than the first system 2, supplies natural gas to users other than the ethylene oxide and glycol apparatus 4, is connected by a pressure regulating valve a provided at the end of the first system 2, and controls the downstream pressure. The design pressure of the first relief valve 21 and the second relief valve 22 is 0.79Mpa, and the valve h 23 sets the linkage upper limit 0.42Mpa and the linkage lower limit 0.35 Mpa.
The function of each valve in the system is as follows: the pressure regulating valve a 6 is a valve connecting the first system 2 and the second system 11, and the opening degree of the pressure regulating valve a 6 is controlled by the controller PIC by acquiring a pressure signal of the second system 11. The valve b 7, the valve c 8, the valve d 9, the valve e 10, the valve f 13 and the valve g 14 are all pipe end valves of the pipeline, and are in a closed state normally, and when an enterprise needs to build a new device, the pipeline is extended from the position. The first relief valve 21 and the second relief valve 22 are safety relief valves having a certain rated pressure according to a safe operation pressure of the system. The valve i 24 and the valve j 25 are normally open valves, the valve k 26 is a normally closed valve, and when the valve h 23 needs to be overhauled, the valve i 24 and the valve j 25 are closed to be isolated from the system, and the valve k 26 is opened to release pressure, so that the valve h 23 is overhauled. The valve h 23 is also a safety relief valve, and the PIC controller controls the valve h 23 to be closed by acquiring a pressure signal on the pipeline of the second system 11. The valve m 27 is a pressure regulating valve, and the opening degree of the valve m 27 is controlled by the PIC controller by acquiring a pressure signal on the pipeline of the first system 2. The valve n 28 and the valve p 30 are normally open valves, the valve q is a pressure relief valve, and the valve r is a bypass valve. When the flowmeter 29 has a fault, the operation is ensured by opening the bypass valve r 32, closing the valve n 28 and the valve p 30 to be isolated from the system, opening the valve q 31 to release pressure, and overhauling the flowmeter 29.
During normal operation, natural gas is introduced into the control device 1 from natural gas, the pressure is controlled to be 0.6 +/-0.1 Mpa, and the natural gas is stably conveyed to the sets of ethylene oxide and glycol devices 4. The high oxygen content tail gas of the ethylene oxide and ethylene glycol plant 4 is led out to a second system 11 through a tail gas discharge pipeline 3. The high oxygen content tail gas comprises the following components: the content of oxygen is 10-11 vt.%, the content of methane is 49.5-51 vt.%, the content of ethylene is 23-24 vt.%, the content of argon is 11.5-13.8 vt.%, and the rest is nitrogen, carbon dioxide and the like. The flow fluctuation of the high oxygen content tail gas emission is transmitted to the second system 11, and the pressure is balanced by the pressure regulating valve a 6. The pressure regulating valve a 6 sets the automatic control parameter to be 0.4 plus or minus 0.1 Mpa to ensure the pressure stability of the second system 11, and the second system 11 continuously supplies gas to a plurality of sets of boilers 18, a plurality of sets of ethane cracking ethylene preparing devices, a torch and other users through a gas supply pipeline 15. When the pressure on the second system 11 exceeds 0.42Mpa, the valve h 23 is automatically opened for pressure relief, when the pressure is reduced to 0.35Mpa, the valve h 23 is automatically closed, if the valve h 23 cannot meet the normal pressure relief capacity, and the system continuously boosts the pressure to 0.5Mpa, the first safety valve 21 and the second safety valve 22 are opened for pressure relief, so that the system safety is ensured.
Example 1
A fuel gas system for treating tail gas with high oxygen content comprises a first system 2 and a second system 11, a closing valve b 7, a valve c 8, a valve d 9, a valve e 10, a valve f 13, a valve g 14, a valve k 26, a valve q 31 and a valve r 32. Valve i 24, valve j 25, valve n 28, valve p 30 are opened. The valve m 27 was set to automatic pressure regulation control at 0.6 Mpa. The pressure regulating valve a 6 is set to automatically regulate and control the pressure to 0.4 Mpa. The first safety valve 21 and the second safety valve 22 ensure that the front valve and the rear valve are opened for use and are periodically checked. The valve h 23 is set in a linkage state, the upper linkage limit is 0.42MPa, and the lower linkage limit is 0.35 MPa. The fuel gas goes to each user, all has the valve in user's boundary area, and the user freely gets gas, and fuel gas system pressure is reliable and stable, and the tail gas is incorporated into the power networks safe and smoothly.
The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (8)
1. A fuel gas system for treating high oxygen content tail gas is characterized in that: the fuel gas system mainly comprises two-stage pressure operation systems, namely a first system and a second system; the front end of the first system is provided with a natural gas introduction control device, and the natural gas introduction control device is used for regulating and controlling natural gas introduced outside a boundary region; the tail end of the first system is connected with the front end of the second system, a pressure regulating valve a is arranged between the tail end of the first system and the front end of the second system, and the pressure regulating valve a regulates the pressure of the first system to be larger than that of the second system; the first system is provided with a plurality of air supply pipelines connected to ethylene oxide and ethylene glycol devices; the second system is provided with a plurality of gas supply pipelines and a plurality of tail gas discharge pipelines for receiving the high oxygen-containing tail gas of the ethylene oxide and ethylene glycol device, and the second system is also provided with a safety release device.
2. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: the natural gas introducing control device comprises a valve p, a flowmeter, a valve n, a valve m, a valve q and a valve r; the valve p and the valve n are normally open valves, the valve m is a pressure regulating valve, the valve q is a pressure relief valve, and the valve r is a bypass valve.
3. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: the safety release device comprises a first safety valve, a second safety valve, a valve h, a valve i, a valve j and a valve k; the valve i and the valve j are normally open valves, the valve k is a normally closed valve, and the valve h is a safety relief valve.
4. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: in the second system, the ratio of the total supply amount of the natural gas to the input amount of the high-oxygen-content tail gas is not less than 13.3.
5. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: the pressure value in the first system is 0.2-0.3 Mpa higher than the pressure value in the second system.
6. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: the total volume of the pipeline of the second system is more than or equal to 800M3。
7. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: and a gas supply pipeline on the second system is connected to one or a combination of more than two of an overhead torch, a ground torch, a torch liquid separation tank, a boiler or an ethane cracking device.
8. The fuel gas system for treating the tail gas with high oxygen content according to claim 1, characterized in that: the remote end of the tail end of the first system is provided with a double valve, the remote ends of the two ends of the second system are provided with double valves, and the double valves are reserved for newly added users.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536419A (en) * | 2020-05-29 | 2020-08-14 | 连云港石化有限公司 | Treatment system and treatment method for high-oxygen-content tail gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536419A (en) * | 2020-05-29 | 2020-08-14 | 连云港石化有限公司 | Treatment system and treatment method for high-oxygen-content tail gas |
| CN111536419B (en) * | 2020-05-29 | 2024-06-04 | 连云港石化有限公司 | High-oxygen-content tail gas treatment system and treatment method thereof |
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