CN111561703A - Ground flare system for low-temperature propylene storage tank of PDH device - Google Patents
Ground flare system for low-temperature propylene storage tank of PDH device Download PDFInfo
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- CN111561703A CN111561703A CN202010410790.6A CN202010410790A CN111561703A CN 111561703 A CN111561703 A CN 111561703A CN 202010410790 A CN202010410790 A CN 202010410790A CN 111561703 A CN111561703 A CN 111561703A
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- pilot burner
- steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/005—Gaseous fuel from a central source to a plurality of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/007—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/007—Regulating fuel supply using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
Abstract
The invention provides a ground flare system for a low-temperature propylene storage tank of a PDH device, relates to the technical field of flare systems, and mainly solves the technical problem of the ground flare system. The ground torch system comprises a pilot burner and a pilot burner fuel supply unit, wherein the pilot burner fuel supply unit is connected with the pilot burner and at least comprises a pilot burner fuel main pipeline, a natural gas pipeline and a fuel mixing gas pipeline, the pilot burner fuel main pipeline is connected with the pilot burner, and the natural gas pipeline and the fuel mixing gas pipeline are connected with the pilot burner fuel main pipeline so that the natural gas pipeline and the fuel mixing gas pipeline can both provide fuel for the pilot burner. The fuel mixed gas pipeline is connected with a discharge pipeline of combustible tail gas generated in production operation, so that the pilot burner can take the combustible tail gas as fuel and can also take natural gas as fuel. When the combustible tail gas is normal, the combustible tail gas is used as fuel of the pilot burner to save natural gas. When the combustible tail gas is abnormal, natural gas can be used as fuel of the pilot burner.
Description
Technical Field
The invention relates to the technical field of flare systems, in particular to a ground flare system for a low-temperature propylene storage tank of a PDH (chemical vapor deposition) device.
Background
The PDH device for preparing propylene by propane dehydrogenation can produce 60 ten thousand tons of propylene under the design of 100% load and generate a certain amount of tail gas of the device. Existing PDH devices are designed with a complete set of propylene storage systems. Normal temperature propylene produced by a PDH device is stored in a spherical tank. In order to prevent the overpressure of a low-temperature propylene storage system of a device for preparing propylene by propane dehydrogenation, a ground torch device is configured for the low-temperature propylene storage system of the device for preparing propylene by propane dehydrogenation, so that the explosion danger caused by the overpressure of a low-temperature propylene storage tank is solved, and emergency pressure relief treatment is carried out.
Specifically, the low-temperature propylene storage tank system comprises 2 low-temperature propylene storage tanks, a BOG compressor and other auxiliary facilities, under the normal operation condition, the temperature of propylene liquid in the tanks is-45 ℃ to-47 ℃, and the tank pressure is maintained to be 5KPaG to 11KPaG through a BOG (Boil Off Gas) compressor system. When the pressure of the low-temperature propylene tank is required to be suddenly released when the normal system pressure cannot be ensured due to the capability of the BOG compressor for compressing the gas propylene or the overpressure of the low-temperature propylene tank caused by the abnormal inability of the BOG compressor for compressing the gas propylene, the system pressure release is carried out on the gas-phase propylene in the low-temperature propylene tank through a ground torch discharge pipeline, and the low-temperature propylene storage tank is ensured to be in a normal operation range.
The existing ground flare system comprises a burner and an incandescent lamp, wherein the burner generates a large amount of black smoke in the combustion process, so that the environment is polluted, and the black smoke is easily accumulated in a furnace body to influence the normal work of the burner. The pilot burner mostly uses natural gas as fuel, so that the gas consumption is high, and further, a torch system in the prior art is wasted greatly, and the operation cost is high.
Disclosure of Invention
One of the purposes of the present invention is to provide a ground torch system, which solves the technical problems of the ground torch systems in the prior art. Advantageous effects can be achieved in preferred embodiments of the present invention, as described in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the ground torch system for the low-temperature propylene storage tank of the PDH device comprises a pilot burner and a pilot burner fuel supply unit, wherein the pilot burner fuel supply unit is connected with the pilot burner and at least comprises a pilot burner fuel main pipeline, a natural gas pipeline and a fuel mixed gas pipeline, the pilot burner fuel main pipeline is connected with the pilot burner, the natural gas pipeline and the fuel mixed gas pipeline are connected with the pilot burner fuel main pipeline, and the fuel mixed gas pipeline is connected with a combustible waste gas discharge pipeline generated in production operation, so that the natural gas pipeline and the fuel mixed gas pipeline can both provide fuel for the pilot burner.
As a further preferable technical solution of the present invention, the fuel mixture pipeline includes a fuel mixture storage tank and a first gas valve, an air outlet of the fuel mixture storage tank is connected to the pilot burner fuel main pipeline, and the first gas valve is located between the fuel mixture storage tank and the pilot burner fuel main pipeline.
As a further preferable technical scheme, an air inlet of the fuel mixed gas storage tank is connected with a tail gas pipeline of a PDH device.
As a further preferable technical solution of the present invention, a second gas valve is provided between the natural gas pipeline and the fuel main pipeline of the pilot burner.
As a further preferred technical scheme of the invention, the natural gas pipeline comprises a first natural gas branch pipeline and a second natural gas branch pipeline, and the first natural gas branch pipeline is connected with the pilot burner fuel main pipeline; the second natural gas branch pipeline is connected with the fuel mixed gas storage tank and/or a tail gas pipeline of the PDH device.
As a further preferable technical solution of the present invention, a second gas valve is provided between the first natural gas branch pipe and the pilot burner fuel main pipe. And a third gas valve is arranged on the second natural gas branch pipeline.
As a further preferable technical solution of the present invention, the pilot burner fuel supply unit further includes a gas pressure gauge, and the gas pressure gauge is located on a main fuel pipe of the pilot burner.
The ground torch system as a further preferable technical scheme of the invention also comprises a steam smoke removal unit and a combustor, wherein the steam smoke removal unit is connected with the combustor, and the steam smoke removal unit can be used for removing black smoke generated by the combustor and cleaning the combustor.
As a further preferable technical scheme, the steam smoke removal unit comprises a steam main pipeline and steam branch pipelines, wherein one end of each steam branch pipeline is connected with the steam main pipeline, and the other end of each steam branch pipeline is correspondingly connected with each stage of combustor.
As a further preferable technical scheme of the invention, the steam branch pipelines are provided with steam regulating valves, so that the steam regulating valves can regulate the on-off of each steam branch pipeline.
The ground torch system which is a further preferable technical scheme of the invention also comprises a PLC control system, and the steam regulating valve is connected with the PLC control system, so that the PLC control system can control the opening degree of the steam regulating valve.
The ground flare system provided by the invention at least has the following beneficial technical effects:
the invention improves the ground torch system, thereby increasing the fuel types of the pilot burner. Specifically, by adding a fuel gas mixing pipeline, tail gas generated in the process of producing propylene products by a propylene production and manufacturing device can be effectively utilized. The pilot burner can use the tail gas of a PDH device as fuel and can also use natural gas as fuel. Specifically, when the tail gas of the PDH device is normal, the tail gas of the PDH device is selected as the fuel of the pilot burner, and the purpose of saving natural gas is achieved. When the tail gas of the PDH device is abnormal, the fuel of the pilot burner can be switched into natural gas through the pilot burner fuel supply unit, and the purpose of saving energy is further achieved.
According to the preferable technical scheme, the natural gas pipeline is connected with a tail gas pipeline of a PDH device and/or a fuel mixed gas storage tank, and the second natural gas branch pipeline is provided with the third gas valve, so that when the pressure in the tail gas pipeline of the PDH device is insufficient, the tail gas pipeline of the PDH device can be supplemented through the second natural gas branch pipeline, and further, when the tail gas in the tail gas pipeline of the PDH device is less, the tail gas pipeline of the PDH device can still be used for burning of a pilot burner.
According to the ground flare system adopting the preferable technical scheme, the combustor is arranged, so that black smoke generated during combustion of the combustor and smoke accumulated in the sweeping combustion furnace can be effectively removed, and further, gas exhausted by the ground flare system is cleaner and more environment-friendly. Furthermore, the burners in the ground flare system are arranged in a grading manner, the steam smoke removal unit is provided with steam branch pipelines, and each steam branch pipeline is respectively connected with each grade of burner, so that each grade of burner is cleaned in a grading manner, the consumption of steam is reduced, and the purposes of reducing cost and saving energy are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic illustration of a flare system according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a preferred embodiment of the pilot light fuel supply unit of the present invention;
FIG. 3 is a schematic of tail gas generation for a PDH plant in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic illustration of a ground flare system and cryogenic storage tube in accordance with a preferred embodiment of the present invention;
fig. 5 is a schematic view of a preferred embodiment of the pilot lamp of the present invention.
In the figure: 1-a pilot lamp; 11-ultraviolet flame detector; 12-an ignition device; 2-pilot burner fuel supply unit; 21-pilot burner fuel main; 22-natural gas pipeline; 221-a first natural gas branch line; 222-a second natural gas branch line; 223-a second gas valve; 224-a third gas valve; 23-fuel mixture line; 231-fuel mixture storage tank; 232-first gas valve; a tail gas pipeline of a 24-PDH device; 25-gas pressure gauge; 26-propylene supply line; 261-a fourth gas valve; 3-a steam smoke removal unit; 31-a steam main; 32-a steam branch pipe; 321-a steam regulating valve; 4-a burner; 41-first stage combustor; 42-a second stage combustor; 43-third stage burner.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1 and 2, as a preferred embodiment, the ground flare system for the low-temperature propylene storage tank of the PDH device comprises an incandescent lamp 1 and an incandescent lamp fuel supply unit 2, wherein the incandescent lamp fuel supply unit 2 is connected with the incandescent lamp 1, the incandescent lamp fuel supply unit 2 at least comprises an incandescent lamp fuel main pipe 21, a natural gas pipe 22 and a fuel mixed gas pipe 23, the incandescent lamp fuel main pipe 21 is connected with the incandescent lamp 1, the natural gas pipe 22 and the fuel mixed gas pipe 23 are connected with the incandescent lamp fuel main pipe 21, and the fuel mixed gas pipe 23 is connected with a combustible waste gas discharge pipe generated in the production operation, so that the natural gas pipe 22 and the fuel mixed gas pipe 23 can both supply fuel to the incandescent lamp 1.
Referring to fig. 4, the low-temperature propylene storage tank system comprises the low-temperature propylene storage tank, a BOG compressor and other auxiliary facilities, under normal operation conditions, the temperature of propylene liquid in the tank is-45 ℃ to-47 ℃, and the tank pressure is maintained to be 5KPaG to 11KPaG through a BOG (Boil Off Gas) compressor system. When the capacity of the BOG compressor for compressing the gas propylene cannot guarantee normal system pressure or the BOG compressor is abnormal and cannot compress the gas propylene, so that the pressure of the low-temperature propylene tank is over-pressure, emergency pressure relief is needed. Specifically, the gas-phase propylene in the low-temperature propylene tank is subjected to system pressure relief through a ground torch discharge pipeline, so that the low-temperature propylene tank is ensured to be in a normal operation range. The ground torch combustion furnace is internally provided with an ignited incandescent lamp 1, and when gas is discharged, flame is transmitted to the combustor 4 through the incandescent lamp 1, so that the combustor 4 is ignited.
In the prior art, the pilot burner 1 mainly uses natural gas as a raw material to ensure that the pilot burner 1 can be continuously ignited. The pilot burner fuel supply unit 2 is redesigned, and the fuel mixed gas pipeline 23 is additionally arranged, so that the pilot burner 1 can not only use natural gas as fuel, but also use mixed fuel gas as fuel. Thereby increasing the variety of the fuel of the pilot burner 1. The technical problem of among the prior art natural gas pipeline appear stopping gas because of overhauing is solved to, can also as required, let in combustible waste gas into fuel gas mixture pipeline 23 and provide fuel for pilot burner 1, not only realize combustible waste gas's utilization, can also practice thrift the natural gas, and then reduce the running cost of ground torch system.
Referring to fig. 1 and 2, as a further preferred embodiment of the present invention, the fuel mixture pipe 23 includes a fuel mixture storage tank 231 and a first gas valve 232, an air outlet of the fuel mixture storage tank 231 is connected to the pilot burner fuel main pipe 21, and the first gas valve 232 is located between the fuel mixture storage tank 231 and the pilot burner fuel main pipe 21.
The above preferred embodiment can be used for storing the fuel mixture by providing the fuel mixture storage tank 231, and can also ensure that the pilot burner 1 can obtain the fuel with continuous pressure by adjusting the air pressure in the fuel mixture storage tank 231, thereby ensuring that the pilot burner 1 can be continuously in the ignition state.
In a preferred embodiment, the inlet of the fuel-air mixture storage tank 231 is connected to the tail gas pipeline 24 of the PDH device.
In the above preferred embodiment, the PDH device tail gas pipeline 24 provides the fuel mixture, i.e. the PDH device tail gas, to the fuel mixture storage tank 231, so that the combustible tail gas generated in the propylene product manufacturing process can be used for storing the low-temperature propylene, thereby saving the natural gas and utilizing the tail gas generated in the propylene product manufacturing process, and achieving the win-win effect according to local conditions. It should be noted that, referring to fig. 3, in the production and manufacturing process of propylene product, propane is dehydrogenated in one step by the catalyst through the reactor to produce propylene and hydrogen, wherein side reactions are generated during the reaction process to produce light components. The hydrogen-rich tail gas and light components generated by propane dehydrogenation form the tail gas of the PDH device.
Referring to fig. 2, as a further preferred embodiment of the present invention, the natural gas pipeline 22 includes a first natural gas branch pipeline 221 and a second natural gas branch pipeline 222, and the first natural gas branch pipeline 221 is connected to the pilot burner fuel main pipeline 21; the second natural gas branch line 222 is connected to the fuel gas mixture storage tank 231 and/or the tail gas line 24 of the PDH device.
In the above preferred embodiment, the second natural gas branch pipeline 222 is connected to the fuel mixture storage tank 231 and/or the tail gas pipeline 24 of the PDH device, so that natural gas can be injected into the fuel mixture storage tank 231 and/or the tail gas pipeline 24 of the PDH device through the second natural gas branch pipeline 222, and further, the situation that the tail gas of the PDH device is insufficient under abnormal conditions or low load of the PDH device is avoided, so that natural gas can be supplemented into the fuel mixture pipeline 23 through the second natural gas branch pipeline 222, and the ignition state of the pilot burner 1 is maintained.
Referring again to fig. 2, as a further preferred embodiment of the present invention, a second gas valve 223 is disposed between the first natural gas branch pipe 221 and the pilot fuel main pipe 21. The second natural gas branch pipe 222 is provided with a third gas valve 224.
In the preferred embodiment, the second gas valve 223 is used for switching the supply relationship of the gas supply branch pipes. Preferably, the third gas valve 224 is a pneumatic regulating valve, so that the third gas valve 224 can regulate the opening of the valve according to the gas pressure in the fuel mixture storage tank 231 and/or the tail gas pipeline 24 of the PDH device. Specifically, the opening degree of the third gas valve 224 is increased when the pressure in the fuel mixture storage tank 231 and/or the tail gas pipeline 24 of the PDH device is decreased; the higher the gas pressure in the fuel mixture storage tank 231 and/or the PDH device tail gas line 24, the smaller the opening of the third gas valve 224. The preferred embodiment can realize the utilization of a small amount of tail gas of the PDH device, and further can improve the utilization rate of the tail gas of the PDH device, thereby achieving the purpose of further saving natural gas.
Referring to fig. 1 and 2, as a further preferred embodiment, the pilot fuel supply unit 2 further comprises a gas pressure gauge 25, the gas pressure gauge 25 being located on the pilot fuel main 21. Preferably, the gas pressure gauge 25 is connected to the PLC control system, so that the PLC control system can adjust the on/off state and/or the valve opening degree of each fuel supply pipeline in the pilot burner fuel supply unit 2 according to the gas pressure in the pilot burner fuel main pipeline 21.
Referring to fig. 1, as a further preferred embodiment of the present invention, the pilot fuel supply unit 2 further includes a propylene supply line 26, the propylene supply line 26 is connected to the pilot fuel main line 21, and a fourth gas valve 261 is provided on the propylene supply line 26. Preferably, the propylene supply line 26 is connected to a cryogenic propylene storage tank and/or a BOG compressor.
In the above preferred embodiment, by providing the propylene supply pipeline 26, not only the fuel supply type of the pilot burner 1 is increased, but also the gas discharge path in the low-temperature propylene storage tank is increased when the low-temperature propylene storage tank needs to be depressurized, so as to improve the discharge efficiency, so that when the low-temperature propylene storage tank needs to be depressurized, the pilot burner 1 can be used for relieving the pressure in the low-temperature propylene storage tank, and can also save natural gas and/or tail gas of a PDH device.
In a preferred embodiment, referring to fig. 1, the ground flare system of the present invention includes two pilot lights 1, and the pilot lights 1 operate independently of each other. More preferably, referring to fig. 5, a fire observation hole is provided above the beacon 1 so that the flame of the beacon 1 can be observed on site. Further preferably, an ultraviolet flame detector 11 is arranged in the fire observation hole to detect whether the pilot burner 1 is in an ignition state. Further preferably, the pilot lamp 1 further includes an ignition device 12, so that the pilot lamp 1 can be ignited by the ignition device 12 and thus can be continuously maintained in an ignited state. Further preferably, each pilot burner 1 is provided with a hand valve for controlling the on-off of the fuel gas of the pilot burner 1.
Referring to fig. 1, the ground flare system of a preferred embodiment of the method further comprises a steam smoke removal unit 3 and a burner 4, wherein the steam smoke removal unit 3 is connected with the burner 4, and the steam smoke removal unit 3 can remove black smoke generated by the burner 4 and clean the burner 4.
According to the preferred embodiment, the steam smoke removal unit 3 can effectively remove black smoke generated after the combustion of the combustor 4, and prevent the low-temperature propylene storage tank from being decompressed and propylene from burning to pollute the environment.
In a preferred embodiment of the method, the burners 4 are arranged in stages. Preferably, the combustor 4 includes a first stage combustor 41, a second stage combustor 42, and a third stage combustor 43. Further preferably, the first stage burner 41 is normally open. It is further preferable that the second stage burner 42 and the third stage burner 43 are opened or closed in stages according to the discharge pressure. Specifically, the discharge valve is opened step by step when the discharge pressure is greater than a high limit (PH); the discharge valve is progressively closed when the discharge pressure is less than a lower limit (PL).
As a preferred embodiment, referring to fig. 1, two pneumatic switch valves connected in parallel are disposed on the system pipeline of the second stage burner 42 and the system pipeline of the third stage burner 43, so as to prevent one of the pneumatic switch valves from being unable to open in time due to a fault, and ensure that the flare gas can enter the first stage burner 41 and/or the second stage burner 42. On the other hand, two pneumatic switching valves arranged in parallel can increase the adjustment range of the amount of flare gas introduced into the first stage burner 41 and the second stage burner 42.
Preferably, in order to ensure that the flare gas can be safely and fully combusted after entering the combustion furnace, the pressure monitoring and control staged combustion is carried out on the discharged gas through the pressure transmitter arranged on the gas collecting main pipe according to the discharge condition of the flare gas. Specifically, the start-up sequence of each stage of the combustor 4 of a preferred embodiment of the present invention is as follows:
the combustion system of the first stage burner 41 is normally open;
second stage burner 42: and if the pressure of the flare gas main pipe is more than PH1, the second stage pneumatic valve PSV-1001A/B is automatically opened to be put into operation. The second stage pneumatic valve PSV-1001A/B automatically closes if the flare gas manifold pressure decreases after the second stage pneumatic valve opens and when the manifold pressure is less than and/or equal to PL 1. The second burner 42 is in a standby state.
Third stage combustor 43: after the second stage burner 42 was put into operation for 15 seconds, if the flare gas manifold pressure was greater than PH2, the third stage pneumatic valve PSV-1002A/B was automatically opened for put into operation. After the third stage pneumatic valve is opened, if the flare gas manifold pressure is reduced, and when the manifold pressure is less than and/or equal to PL2, the third stage pneumatic valve PSV-1002A/B automatically closes. The combustion level automatically returns to the previous level;
fully opening: when the flare header pressure reaches the rapid valve opening pressure set value, the subsequent two-stage discharge valves are opened simultaneously.
Referring again to fig. 1, as a further preferred embodiment of the present invention, the steam smoke removing unit 3 includes a steam main pipe 31 and a steam branch pipe 32, wherein one end of the steam branch pipe 32 is connected to the steam main pipe 31, and the other end is connected to each stage of the combustor 4 in a one-to-one correspondence manner.
In the preferred embodiment, the steam branch pipe 32 can remove the black smoke generated by each stage of the combustor 4, and can also clean the smoke in each stage of the combustor 4.
Referring again to fig. 1, as a further preferred embodiment of the present invention, the steam branch pipes 32 are provided with steam adjusting valves 321, so that the steam adjusting valves 321 can adjust the on/off of the steam branch pipes 32. Preferably, the opening of the steam control valve 321 corresponds to the opening of the burners 4, i.e. the steam control valve 321 on the steam distribution line 32 is opened in stages. Further, the situation that the burner 4 is not opened and the corresponding steam regulating valve 321 is opened can be avoided, so that the purpose of saving steam is achieved.
In a further preferred embodiment of the present invention, the ground flare system further includes a PLC control system, and the steam control valves 321 are connected to the PLC control system such that the PLC control system can control the opening and closing of the steam control valves 321 and the opening degrees of the steam control valves 321.
Preferably, the opening degree of the steam regulating valve 321 on the steam branch pipe 32 is in a linear relationship according to the flow rate of the flare gas main pipe of the combustor 4, namely, the PLC control system controls the opening degree of the steam regulating valve 321 through the flow rate and/or the air pressure of the flare gas main pipe. Specifically, the greater the flow and/or pressure of the flare gas manifold, the greater the opening of the steam regulating valve 321.
In a preferred embodiment of the present invention, the correspondence table between the opening of the steam control valve 321 and the pressure value of the flare header pipe is as follows:
in a preferred embodiment, when the flow rate of the flowmeter is greater than 15Kg/H, the steam regulating valve 321 of the first stage burner corresponding to the steam branch line 32 is opened by 55%, and then is regulated according to the pressure signal. When the corresponding flare gas staging valve is opened, the corresponding steam regulating valve 321 is opened with an opening of 55%, and then is adjusted according to the pressure signal. Preferably, the steam regulating valve 321 is closed after a time delay of one minute after the corresponding flare gas switching valve is closed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A ground flare system for a low-temperature propylene storage tank of a PDH device is characterized by comprising an incandescent lamp (1) and an incandescent lamp fuel supply unit (2), the pilot burner fuel supply unit (2) is connected with the pilot burner (1), and the pilot burner fuel supply unit (2) comprises at least a pilot burner fuel main (21), a natural gas line (22) and a fuel mixture line (23), the pilot burner fuel main line (21) is connected to the pilot burner (1), the natural gas line (22) and the fuel mixture line (23) are connected to the pilot burner fuel main line (21), and the fuel gas mixing pipeline (23) is connected with a combustible waste gas discharge pipeline generated by production operation, so that both the natural gas line (22) and the fuel-mixture gas line (23) can supply fuel to the pilot burner (1).
2. The ground flare system of claim 1, wherein the fuel mixture pipeline (23) comprises a fuel mixture storage tank (231) and a first gas valve (232), an air outlet of the fuel mixture storage tank (231) is connected with the pilot burner fuel main pipeline (21), and the first gas valve (232) is located between the fuel mixture storage tank (231) and the pilot burner fuel main pipeline (21).
3. The surface flare system of claim 2, wherein a gas inlet of the fuel mixture storage tank (231) is connected to a PDH device tail gas line (24).
4. Ground flare system according to claim 2, wherein the natural gas pipeline (22) comprises a first natural gas branch pipeline (221) and a second natural gas branch pipeline (222), the first natural gas branch pipeline (221) being connected with the pilot burner fuel main pipeline (21); the second natural gas branch pipeline (222) is connected with a fuel gas mixture storage tank (231) and/or a tail gas pipeline (24) of a PDH device.
5. The ground flare system of claim 4, wherein a second gas valve (223) is disposed between the first natural gas branch pipe (221) and the pilot light fuel main pipe (21); and a third gas valve (224) is arranged on the second natural gas branch pipeline (222).
6. The ground flare system of claim 1, wherein the pilot fuel supply unit (2) further comprises a gas pressure gauge (24), the gas pressure gauge (25) being located on the pilot fuel main (21).
7. The ground flare system of any one of claims 1 to 6, which further comprises a steam smoke removal unit (3) and a burner (4), wherein the steam smoke removal unit (3) is connected with the burner (4), and the steam smoke removal unit (3) can remove black smoke generated by the burner (4) and clean the burner (4).
8. The ground flare system of claim 7, wherein the steam smoke removal unit (3) comprises a steam main pipeline (31) and a steam branch pipeline (32), one end of the steam branch pipeline (32) is connected with the steam main pipeline (31), and the other end of the steam branch pipeline is connected with each stage of combustor (4) in a one-to-one correspondence manner.
9. Ground flare system according to claim 8, wherein the steam branch pipes (32) are provided with steam regulating valves (321) such that the steam regulating valves (321) can regulate the switching of each steam branch pipe (32).
10. The ground flare system of claim 9, further comprising a PLC control system, and the steam regulating valve (321) is connected to the PLC control system such that the PLC control system can control the opening of the steam regulating valve (321).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010410790.6A CN111561703A (en) | 2020-05-15 | 2020-05-15 | Ground flare system for low-temperature propylene storage tank of PDH device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010410790.6A CN111561703A (en) | 2020-05-15 | 2020-05-15 | Ground flare system for low-temperature propylene storage tank of PDH device |
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Application publication date: 20200821 |