CN117212809A - Dry type isolation device and method and torch system - Google Patents

Abstract

The application discloses a dry type isolation device and method and a torch system, wherein the dry type isolation device comprises a liquid separating tank, and the liquid separating tank comprises an inlet and an outlet; the air inlet of the first isolation pipeline is connected with the outlet; the air inlet of the second isolation pipeline is connected with the outlet and is connected with the first isolation pipeline in parallel; the pressure detection unit is used for detecting the pressure of the flare gas entering the liquid separation tank; and the control unit is used for controlling the flare gas with the pressure smaller than the first pressure value to flow out of the second isolation pipeline, and the flare gas with the pressure larger than or equal to the first pressure value to flow out of the first isolation pipeline. The application can treat low-temperature flare gas and water-soluble flare gas without additionally arranging a water-sealed tank, can effectively isolate air through the first isolation pipeline and the second isolation pipeline, and can ensure the flux of the flare gas without suppressing the pressure of a flare pipeline; when the device is used for discharging flare gas, no secondary pollution is generated, the safety isolation requirement is met, and the device is more environment-friendly.

Description

Dry type isolation device and method and torch system

Technical Field

The application belongs to the technical field of flare gas discharge, and particularly relates to a dry type isolation device and method and a flare system.

Background

A flare is an apparatus for treating a production facility to discharge a combustible gas in an on-off state and an accident state, and it is generally required to configure a water-sealed tank in order to prevent air from penetrating into a combustible gas discharge system to explode. However, the water seal is not beneficial to the discharge of the flare gas with the temperature lower than zero, and the organic medium contained in the flare gas also can pollute the water seal tank, so that the isolation effect is affected.

Disclosure of Invention

The application aims to: the embodiment of the application provides a dry type isolation device and method and a torch system, which can achieve an isolation effect, solve the problem of liquid isolation under a certain discharge condition, meet the safety discharge, and are more energy-saving and environment-friendly.

The technical scheme is as follows: the embodiment of the application provides a dry type isolation device for discharging flare gas, which comprises the following components:

a liquid separation tank comprising an inlet and an outlet;

the air inlet of the first isolation pipeline is connected with the outlet;

the air inlet of the second isolation pipeline is connected with the outlet and is connected with the first isolation pipeline in parallel;

a pressure detection unit connected with the inlet for detecting the pressure of the flare gas entering the liquid separation tank;

and the control unit is connected with the pressure detection unit and is used for controlling the flare gas with the pressure smaller than the first pressure value to flow out of the second isolation pipeline, and the flare gas with the pressure larger than or equal to the first pressure value to flow out of the first isolation pipeline.

In some embodiments, further comprising: the air outlet of the first air blowing pipeline is connected with the air inlet of the first isolation pipeline and/or the air inlet of the second isolation pipeline; from the air inlet of first gas blowing pipeline to the gas outlet of first gas blowing pipeline, first gas blowing pipeline is including steady voltage valve, first check valve and the first restriction orifice plate that connects gradually.

In some embodiments, further comprising: the second air blowing pipeline is connected with the first air blowing pipeline in parallel, and an air outlet of the second air blowing pipeline is connected with the first isolation pipeline and/or an air outlet of the second isolation pipeline; the second air blowing pipeline comprises a pneumatic cut-off valve, a second check valve and a second flow limiting orifice plate which are sequentially connected.

In some embodiments, further comprising:

a first gas source in communication with the inlet for delivering flare gas to the knock-out tank;

the second air source is respectively communicated with the air inlet of the first air blowing pipeline and the air inlet of the second air blowing pipeline and is used for conveying purge gas to the first air blowing pipeline and the second air blowing pipeline.

In some embodiments, the first isolation tube comprises an equal caliber quick opening valve and the second isolation tube comprises a small caliber flame arrestor.

In some embodiments, further comprising:

the air inlet of the third isolation pipeline is communicated with the outlet, and the third isolation pipeline is connected with the first isolation pipeline in parallel; the third isolation pipeline comprises an equal caliber blasting needle valve for performing pressure relief protection on the first isolation pipeline.

In some embodiments, further comprising:

the temperature detection unit is connected with the air outlet of the first isolation pipeline and/or the air outlet of the second isolation pipeline and is used for detecting the temperature of the flare gas flowing out of the liquid separation tank;

the temperature detection unit is connected with the control unit, and the control unit is also used for: and controlling the pneumatic cut-off valve of the second air blowing pipeline to be opened when the temperature is reduced from the first temperature value to below the second temperature value.

In some embodiments, after the control unit controls the flow of flare gas from the first isolation conduit, the control unit is further configured to:

controlling a pneumatic shut-off valve of the second blow line to open in response to the pressure being less than a second pressure value; wherein the second pressure value is less than the first pressure value.

In some embodiments, the first pressure value ranges from 70 to 90kpa, the second pressure value ranges from 20 to 40kpa, the first temperature value ranges from 110 to 130 ℃, and the second temperature value ranges from 75 to 85 ℃; or alternatively

The range of the first pressure value is 10-20 kpa, the range of the second pressure value is 5-8 kpa, the range of the first temperature value is 110-130 ℃, and the range of the second temperature value is 75-85 ℃.

In some embodiments, the present application further provides a dry isolation method applied to the dry isolation device, where the dry isolation method includes the following steps:

obtaining the pressure of flare gas entering a liquid separation tank;

controlling the flare gas with the pressure smaller than the first pressure value to flow out of the second isolation pipeline, and controlling the flare gas with the pressure larger than or equal to the first pressure value to flow out of the first isolation pipeline;

the liquid separating tank comprises an inlet and an outlet, and an air inlet of the first isolation pipeline is connected with the outlet; an air inlet of the second isolation pipeline is connected with the outlet and is connected with the first isolation pipeline in parallel.

In some embodiments, further comprising:

providing a first blowing pipeline and controlling the first blowing pipeline to convey purge gas to the first isolation pipeline and/or the second isolation pipeline; the air outlet of the first air blowing pipeline is connected with the air inlet of the first isolation pipeline and/or the air inlet of the second isolation pipeline.

In some embodiments, further comprising:

providing a second air blowing pipeline, wherein the second air blowing pipeline is connected with the first air blowing pipeline in parallel, and an air outlet of the second air blowing pipeline is connected with the first isolation pipeline and/or an air outlet of the second isolation pipeline;

and acquiring the temperature of the flare gas flowing out of the liquid separating tank, and controlling the pneumatic cut-off valve of the second blowing pipeline to be opened when the temperature is reduced from the first temperature value to below the second temperature value.

In some embodiments, further comprising:

after the flare gas is controlled to flow out of the first isolation pipeline, responding to the condition that the pressure is smaller than a second pressure value, and controlling a pneumatic cut-off valve of the second blowing pipeline to be opened; wherein the second pressure value is less than the first pressure value.

In some embodiments, the application also provides a flare system including the dry isolation device.

The beneficial effects are that: compared with the prior art, the dry type isolation device provided by the embodiment of the application comprises the liquid separating tank, wherein the liquid separating tank comprises an inlet and an outlet; the air inlet of the first isolation pipeline is connected with the outlet; the air inlet of the second isolation pipeline is connected with the outlet and is connected with the first isolation pipeline in parallel; the pressure detection unit is connected with the inlet and used for detecting the pressure of the flare gas entering the liquid separation tank; and the control unit is connected with the pressure detection unit and is used for controlling the flare gas with the pressure smaller than the first pressure value to flow out of the second isolation pipeline, and the flare gas with the pressure larger than or equal to the first pressure value to flow out of the first isolation pipeline. It can be understood that the application can treat low-temperature flare gas and water-soluble flare gas without additionally arranging a water-sealed tank, and can effectively isolate air through the first isolating pipeline and the second isolating pipeline, and can ensure the flux of the flare gas without suppressing the pressure of a flare pipeline; when the device is used for discharging flare gas, no secondary pollution is generated, the safety isolation requirement is met, and the device is more environment-friendly.

It should be noted that the dry isolation method and the flare system may have all the technical features and advantages of the dry isolation device described above, and are not described herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a dry isolation device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a control unit connection provided in an embodiment of the present application;

reference numerals: 10-liquid separating tank, 20-first isolation pipeline, 30-second isolation pipeline, 40-pressure detection unit, 50-control unit, 60-first blowing pipeline, 70-second blowing pipeline, 80-third isolation pipeline, 90-temperature detection unit, 100-first air source, 200-second air source, 101-inlet, 102-outlet, 201-equal caliber quick-opening valve, 301-small caliber flame arrester, 601-pressure stabilizing valve, 602-check valve, 603-first flow limiting orifice plate, 701-pneumatic cut-off valve, 702-second check valve, 703-second flow limiting orifice plate, 801-equal caliber blasting needle valve.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

In the description of the present application, it should be understood that, in the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "plurality" means two or more, and at least one means one, two or more, unless explicitly defined otherwise.

It should also be noted that in the description of the present application, "perpendicular" means completely perpendicular by 90 ° or almost completely perpendicular, for example, calculated as perpendicular in the range of 80 ° to 100 °, and similarly, "parallel" means completely parallel or almost completely parallel, for example, calculated as parallel in the range of 10 ° of completely parallel.

The applicant has noted that the flare is used for treating the combustible gas discharged from the production device of the enterprise in the start-up and accident states, and the combustible gas is burnt and discharged into the atmosphere. The flare facility is generally provided with a water sealed tank, and aims to serve as a liquid isolation facility for isolating the flare from the discharge system and prevent air from penetrating into the combustible gas discharge system to explode. In recent years, the scale and flow of the device are bigger and bigger, the combustible gas components discharged by the device are more and more complex, and the following problems are encountered in practical application: (1) When the discharge temperature of the flare gas is lower than zero, a certain amount of low-temperature flare gas can cause the freezing of liquid in the water-sealed tank when passing through the water-sealed tank, so that the pressure of a combustible gas discharge system is suppressed, and the safe discharge operation of the device is influenced; (2) The flare gas contains water-soluble gases such as ammonia, acid and the like, and generates acid water, ammonia water and other waste water when meeting water, so that the waste water has complex components, the device is not suitable for recycling and other receiving and treating facilities are not provided; (3) When the flare gas is discharged, particularly when a large amount of flare gas is discharged, water surface fluctuation is caused by breaking through the water seal, so that the effective water seal height fluctuation is caused, the discharge pressure of the flare gas is unstable, and pulse combustion is generated; the water surface fluctuation also can bring transverse impact to the water sealed tank, and the long-term accumulation can bring potential damage risk to the water sealed tank foundation; (4) In cold areas, the temperature is low in winter, in order to ensure that the liquid in the water sealed tank is not frozen, steam tracing or electric tracing is needed to be carried out on the water sealed tank, and a certain amount of steam or electric energy is consumed; (5) The flare gas is mainly combustible hydrocarbon gas, a certain amount of oily sewage can be generated after the flare gas passes through a water sealed tank, the flare gas is different from the sewage system in the device, and secondary pollution can be caused when the flare gas is returned to the device for treatment.

The current gas discharged to the torch system has complex components and wide discharge temperature range, and the current torch discharge system cannot be met by a water seal structure which is isolated by liquid only.

Based on the above, it is necessary to provide a dry type isolation device, a dry type isolation method and a torch system, which can achieve an isolation effect, solve the problem of liquid isolation under a certain discharge condition, satisfy safe discharge, and are more energy-saving and environment-friendly.

Referring to FIG. 1, a dry isolation device for flare gas discharge, comprising: a liquid separation tank 10, a first isolation pipe 20, a second isolation pipe 30, a pressure detection unit 40 and a control unit 50; the knock out pot 10 includes an inlet 101 and an outlet 102; the air inlet of the first isolation tube 20 is connected with the outlet 102; the air inlet of the second isolation tube 30 is connected with the outlet 102 and is connected in parallel with the first isolation tube 20; the pressure detection unit 40 is connected to the inlet 101 for detecting the pressure of the flare gas entering the knock out drum 10; the control unit 50 is connected to the pressure detection unit 40 for controlling the flare gas having a pressure less than the first pressure value to flow out of the second isolation piping 30 and the flare gas having a pressure greater than or equal to the first pressure value to flow out of the first isolation piping 20.

It can be understood that the dry isolation device of the embodiment is not provided with a water sealed tank, and can be suitable for low-temperature flare gas and flare gas containing water-soluble gas; the liquid separation tank 10 is used as a key component for separating different components in the flare gas, meanwhile, the pressure detection unit 40 is used for monitoring the pressure of the flare gas entering the liquid separation tank 10, and the control unit 50 can control the flow direction of the flare gas in different pressure states on the premise that the first isolation pipeline 20 and the second isolation pipeline 30 are arranged in parallel according to a set first pressure value, effectively isolate the explosion caused by the penetration of air into a combustible gas discharge system, and can also ensure the flux of the flare gas without pressure holding on a flare pipeline.

In some embodiments, referring to fig. 1 and 2, the dry isolation device further comprises: the air outlet of the first air blowing pipeline 60 is connected with the air inlet of the first isolation pipeline 20 and/or the second isolation pipeline 30; from the air inlet of the first air blowing pipeline 60 to the air outlet of the first air blowing pipeline 60, the first air blowing pipeline 60 comprises a pressure stabilizing valve 601, a first check valve 602 and a first restriction orifice 603 which are sequentially connected. It will be appreciated that the first blowing line 60 is a continuous blowing system that can continuously deliver gas to the first and second isolation lines 20, 30 to ensure a slight positive pressure across the flare line and prevent flashback from air infiltration.

The pressure stabilizing valve 601 is used for controlling the pressure of the gas, ensuring the stable output of the gas in a certain pressure range, and adjusting the pressure of the gas according to the requirement of the subsequent process or equipment. The purpose of the regulator valve 601 is to prevent the gas pressure from being too high or too low, thereby protecting the equipment and system from normal operation. The first check valve 602 is used to control the flow direction of gas or liquid in the pipeline. In the first blow line 60, the first check valve 602 functions to prevent gas from entering the regulator valve or other components during reverse flow, which ensures that gas can only flow in a predetermined direction, preventing reverse flow from damaging the system. The first restriction orifice 603 is a plate-like device with holes for restricting the flow of fluid. In the first blow line 60, the first restriction orifice 603 serves to restrict the flow of gas through the size and number of orifices, which may control the velocity and pressure drop of the gas to meet specific process requirements or operating conditions of the apparatus. In summary, these components, through synergy, may enable control of the gas flow and pressure, ensuring that the gas flows and supplies stably under appropriate conditions, which helps to improve stability, safety, and efficiency of the system, and ensure proper operation of subsequent processes or equipment.

In some embodiments, the dry isolation device further comprises: the second air blowing pipeline 70, the second air blowing pipeline 70 is connected with the first air blowing pipeline 60 in parallel, and the air outlet of the second air blowing pipeline 70 is connected with the air outlet of the first isolation pipeline 20 and/or the second isolation pipeline 30; from the air inlet of the second air blowing line 70 to the air outlet of the second air blowing line 70, the second air blowing line 70 includes a pneumatic shut-off valve 701, a second check valve 702, and a second restriction orifice 703 connected in sequence. It can be understood that the second blowing pipeline 70 is an emergency blowing system, because the second blowing pipeline 70 is connected in parallel with the first blowing pipeline 60, the second blowing pipeline 70 is closed under a general working condition, and when the flare gas pressure in the device changes to judge that the discharge amount of the flare gas is reduced or even the discharge is finished or when the flare gas temperature in the device drops to judge that the flare gas discharge amount is reduced, the second blowing pipeline 70 is opened to perform emergency purging on the flare pipeline; the second blow line 70 may purge the residual flare gas, ensuring that no flammable gas remains within the line, which helps to prevent the flare gas from accumulating and forming an explosive mixture in the line, improving the safety of the system; and the cold shrinkage phenomenon can be eliminated by purging the pipeline, and the normal gas flow is recovered, so that the stable operation of the system is ensured.

Wherein a pneumatic shut-off valve 701 is used to control the switching of the gas flow. In the second blowing line 70, the pneumatic shut-off valve 701 functions to normally close the second blowing line 70, preventing the flow of the emergency purge gas, which can ensure that the second blowing line is kept closed under normal conditions to save energy and maintain the stability of the system. The second check valve 702 functions similarly to the first check valve 602 for controlling the flow direction of gas or liquid in the pipeline. The second restriction orifice plate 703 functions similarly to the first restriction orifice plate 603 to restrict the flow of gas. Overall, the second blow line 70 achieves control and limitation of the emergency purge gas by the synergistic action of the pneumatic shut-off valve 701, the second check valve 702 and the second restriction orifice 703, which helps ensure that the emergency purge gas is conducted under appropriate conditions, avoiding excessive purging or unnecessary energy consumption. At the same time, it also provides additional protection to the system, preventing the emergency purge gas from entering other components or systems, ensuring safe and reliable operation of equipment and piping.

In some embodiments, with further reference to fig. 1, the dry isolation device further comprises: a first gas source 100, the first gas source 100 being in communication with the inlet 101 for delivering flare gas to the knock-out tank 10; and a second air source 200, the second air source 200 being respectively communicated with the air inlets of the first air blowing pipeline 60 and the second air blowing pipeline 70 for supplying purge gas to the first air blowing pipeline 60 and the second air blowing pipeline 70. The first gas source may comprise oxygen, fuel gas (e.g., acetylene, propane, methane, hydrogen, etc.), water vapor, carbon dioxide, etc., and the second gas source 200 may comprise nitrogen, compressed air, or an inert gas, etc.

In some embodiments, the first isolation tube 20 includes an equal bore quick-opening valve 201. It can be appreciated that the flare gas with larger discharge amount enters the flare through the first isolation pipeline 20 where the equal caliber quick opening valve 201 is located, the equal caliber quick opening valve 201 can be opened or closed quickly, so that fluid can pass through the valve quickly, and the quick response characteristic enables the valve to adjust the flow rate of the fluid quickly, so that specific process requirements or operation demands are met. In emergency, the constant-caliber quick-opening valve 201 can quickly close a fluid pipeline and cut off the flow of fluid, which is important to avoid accident expansion and protect the safety of equipment or a system.

In some embodiments, the second isolation tube 30 includes a small gauge flame arrestor 301. It will be appreciated that the continuous or small-gauge flare gas is fed into the flare for combustion through the second isolation tube 30 in which the small-gauge flame arrestor 301 is located, which is a safety device for preventing the propagation of flames, typically in a piping system or apparatus, which functions to prevent flames in the combustible gas or vapor from propagating to the other side of the piping, thereby preventing the occurrence of a fire or explosion. Small caliber flame arrestors are typically made of metal or other high temperature resistant material with a series of tiny holes or channels. These holes or channels may allow gases or vapors to pass through, but prevent the propagation of flames. When flame or explosion occurs in the pipeline, the small-caliber flame arrester can diffuse and cool heat in the flame through the special structure and materials of the small-caliber flame arrester, so that the heat cannot pass through holes or channels of the flame arrester, and flame propagation is prevented.

Further, the nominal diameter of the small-caliber flame arrester 301 of the present embodiment is 100 to 200mm.

In some embodiments, the dry isolation device further comprises: the third isolation pipeline 80, the air inlet of the third isolation pipeline 80 is communicated with the outlet 102, and the third isolation pipeline 80 is connected in parallel with the first isolation pipeline 20; the third isolation tube 80 includes an equal caliber burst needle valve 801 for pressure relief protection of the first isolation tube 20. It should be noted that, in order to ensure the safety of the torch, a path of pressure relief bypass needs to be added, and a blasting needle valve is configured; in order to prevent the quick-opening valve from being unable to be opened or failed in time, a third isolation pipeline 80 is arranged, and when the pressure reaches the bursting pressure of the quick-opening valve, the mechanical automatic bursting is used for pressure relief, so that the flare gas can be discharged into a flare system in time. The blasting needle valve is used as a pressure relief bypass, so that the blasting valve is safer and more reliable than a traditional blasting sheet. Because of more flare gas discharge components and large discharge pressure fluctuation, the explosion precision of the rupture disk is insufficient, and the conditions of false explosion and reverse explosion often occur; fragments are stored in the pipeline after the rupture disc is exploded, so that the upstream and downstream devices are damaged; in addition, when the rupture disk is replaced, the torch system is stopped, and the upstream production device is influenced. The equal caliber blasting needle valve 801 is used as a pressure relief device of a flare gas bypass, so that the problems can be avoided, and in addition, the equal caliber blasting needle valve 801 is not influenced by medium properties (particularly low temperature and toxicity) due to a non-contact structure, so that the equal caliber blasting needle valve 801 is safer and more reliable.

In some embodiments, referring to fig. 1 and 2, the dry isolation device further comprises: a temperature detection unit 90, the temperature detection unit 90 being connected to the air outlet of the first isolation piping 20 and/or the second isolation piping 30 for detecting the temperature of the flare gas flowing out of the knock out tank 10; the temperature detection unit 90 is connected to the control unit 50, and the control unit 50 is further configured to: the pneumatic shut-off valve 701 of the second blow line 70 is controlled to open in response to the temperature falling below the second temperature value from the first temperature value. It will be appreciated that the temperature detection unit 90 may monitor the temperature of the flare gas exiting the split tank 10 in real time, which may be helpful in understanding the thermal conditions of the flare gas, as well as possible temperature variations or anomalies; when the temperature falls below the second temperature value, the control unit 50 may respond to and control the pneumatic shut-off valve 701 of the second blow line 70 to open, which may enable an emergency purge, clear of possible cold shrink phenomena, and ensure a normal flow of flare gas. Through temperature detection and control, the dry type isolation device can monitor and control the temperature of the flare gas in real time, measures are taken in time to avoid cold shrinkage, the safety and the stability of the system are improved, and potential safety risks and operation problems are prevented.

In some embodiments, after the control unit 50 controls the flow of flare gas from the first isolation piping 20, the control unit 50 is further configured to: in response to the pressure being less than the second pressure value, controlling the pneumatic shut-off valve 701 of the second blow line 70 to open; wherein the second pressure value is less than the first pressure value. It will be appreciated that by controlling the pneumatic shut-off valve 701 of the second blow line 70 to open, it can be ensured that flare gas is released when the pressure is less than the second pressure value, which helps to avoid flare gas pressure from being too high, reducing pressure loads on equipment and lines, and thereby improving safety and stability of the system. By controlling the pressure of the flare gas and releasing excess gas when appropriate, the efficiency of the system can be improved, excessive pressure and pressure accumulation can be avoided, energy waste can be reduced, and the operating efficiency and energy utilization rate of the system can be improved.

In some embodiments, the first pressure value and the second pressure value have different range requirements depending on different operating conditions, because the discharge pressures of different production devices are different. For high pressure exhaust gas, the range of the first pressure value is 70-90 kpa, the range of the second pressure value is 20-40 kpa, preferably, the first pressure value is 80kpa, and the second pressure value is 30kpa; for low pressure exhaust gas, the first pressure value ranges from 10 to 20kpa, the second pressure value ranges from 5 to 8kpa, preferably the first pressure value is 15kpa and the second pressure value is 5kpa.

In some embodiments, the first temperature value ranges from 110 to 130 ℃, the second temperature value ranges from 75 to 85 ℃, and preferably, the first temperature value is 120 ℃, and the second temperature value is 80 ℃.

In some embodiments, the present embodiment further provides a dry isolation method, including the steps of:

acquiring the pressure of the flare gas entering the liquid separation tank 10;

controlling the flare gas having a pressure less than the first pressure value to flow out of the second isolation piping 30 and the flare gas having a pressure greater than or equal to the first pressure value to flow out of the first isolation piping 20; wherein, the liquid separating tank 10 comprises an inlet 101 and an outlet 102, and the air inlet of the first isolation pipeline 20 is connected with the outlet 102; the inlet port of the second isolation tube 30 is connected to the outlet port 102 and is connected in parallel with the first isolation tube 20.

In some embodiments, the steps of the dry isolation method further comprise: providing a first blow line 60 and controlling the first blow line 60 to deliver a purge gas to the first isolation line 20 and/or the second isolation line 30; wherein the air outlet of the first air blowing pipeline 60 is connected with the air inlet of the first isolation pipeline 20 and/or the second isolation pipeline 30.

In some embodiments, the steps of the dry isolation method further comprise: providing a second air blowing pipeline 70, wherein the second air blowing pipeline 70 is connected with the first air blowing pipeline in parallel, and the air outlet of the second air blowing pipeline 70 is connected with the air outlet of the first isolation pipeline 20 and/or the second isolation pipeline 30; the temperature of the flare gas exiting the split tank 10 is obtained and the pneumatic shut-off valve 701 of the second blow line 70 is controlled to open in response to the temperature falling below a second temperature value from a first temperature value.

In some embodiments, the steps of the dry isolation method further comprise: after controlling the flare gas to flow out of the first isolation conduit 20, controlling the pneumatic trip valve 701 of the second blow conduit 70 to open in response to the pressure being less than the second pressure value; wherein the second pressure value is less than the first pressure value.

In some embodiments, the present embodiments also provide a flare system including the dry isolation device described above.

Referring to fig. 1, the specific implementation process of the apparatus of this embodiment is as follows:

(1) Normal emissions or low flow emissions operating conditions: after the flare gas passes through the liquid separation tank 10, the flare gas passes through the pressure detection unit 40, wherein the pressure detection unit 40 consists of three pressure sensors, the pressure of the flare gas is obtained by averaging the obtained three values, when the pressure is lower than the first pressure value of 15kpa, the flare gas is discharged into the flare through the second isolation pipeline 30 for combustion treatment, and when the continuous detection pressure is lower than 5kpa, the second isolation pipeline 30 is closed at the moment.

(2) A large number of emissions operating conditions: after the flare gas passes through the liquid separation tank 10, the flare gas passes through the pressure detection unit 40, wherein the pressure detection unit 40 consists of three pressure sensors, the pressure of the flare gas is obtained by averaging the obtained three values, and when the pressure is higher than the first pressure value of 80kpa, the flare gas is discharged into the flare through the first isolation pipeline 20 for combustion treatment; when the continued detection pressure is below 30kpa, the mass displacement ends, at which point the first isolation tube 20 is closed.

(3) And setting two paths of nitrogen purging protection systems of continuous purging and emergency purging.

The first blowing pipeline 60 is adopted for continuous nitrogen purging, so that micro-positive pressure of the whole torch pipeline can be ensured, and air infiltration is prevented from tempering. The nitrogen pressure stabilizing valve 601, the first check valve 602 and the first restriction orifice 603 are then introduced into the flare gas pipeline to maintain the micro positive pressure of the system.

The emergency purging adopts the second blowing pipeline 70, when the pressure detection unit 40 detects that the pressure reaches the first pressure value and is discharged for a period of time, and when the pressure is detected to be lower than the second pressure value, the second blowing pipeline 70 is opened to purge, namely the pneumatic cut-off valve 701 is opened, and nitrogen is blown into the flare gas pipeline for purging for 15min through the pneumatic cut-off valve 701, the second check valve 702 and the second flow limiting orifice 703, and then the pneumatic cut-off valve 701 is closed. Or, when the flare gas is discharged, the temperature detection unit 90 detects that the temperature of the flare gas reaches 120 degrees, and when the temperature is detected to be lower than 80 degrees after the discharge is performed for a period of time, the phenomenon of shrinkage caused by the reduction of the discharge amount of the flare gas is judged, the pneumatic cut-off valve 701 is opened to carry out emergency purging on the flare pipeline for 15min, and then the pneumatic cut-off valve 701 is closed.

It can be appreciated that this embodiment adds the small-bore flame arrester on the bypass, satisfies the normal continuous or low discharge operating mode of device, and the flare gas pipeline is not under pressure, helps protecting quick-opening valve, prevents valve leakage and fatigue deformation, sets up the flame arrester and can also effectively prevent backfire emergence, protects the device upstream, disposes nitrogen gas in the device and sweeps the system, sweeps the protection to the flare system when discharging in a large number and ending or closing quick-opening valve. The isolating device is provided with a flame arrester, a cut-off valve, a blasting needle valve, a purging pipeline and the like, can treat low-temperature flare gas and water-soluble flare gas, does not need to additionally arrange a water-sealed tank, does not produce secondary pollution, and meets the safety isolation requirement, and is safer, more reliable and environment-friendly.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The dry type isolation device, the dry type isolation method and the torch system provided by the embodiment of the application are described in detail, and the principle and the implementation mode of the application are described by applying specific examples, wherein the description of the above examples is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (14)

1. A dry isolation device for flare gas discharge, comprising:

a liquid separation tank (10), the liquid separation tank (10) comprising an inlet (101) and an outlet (102);

a first isolation tube (20), an air inlet of the first isolation tube (20) being connected to the outlet (102);

a second isolation pipe (30), wherein an air inlet of the second isolation pipe (30) is connected with the outlet (102) and is connected with the first isolation pipe (20) in parallel;

a pressure detection unit (40) connected to the inlet (101) for detecting the pressure of the flare gas entering the knock-out tank (10);

and the control unit (50) is connected with the pressure detection unit (40) and is used for controlling the flare gas with the pressure smaller than the first pressure value to flow out of the second isolation pipeline (30), and the flare gas with the pressure larger than or equal to the first pressure value to flow out of the first isolation pipeline (20).

2. The dry isolation device of claim 1, further comprising: a first air blowing pipeline (60), wherein an air outlet of the first air blowing pipeline (60) is connected with an air inlet of the first isolation pipeline (20) and/or the second isolation pipeline (30); from the air inlet of first gas blowing pipeline (60) to the gas outlet of first gas blowing pipeline (60), first gas blowing pipeline (60) are including steady voltage valve (601), first check valve (602) and first restriction orifice (603) that connect gradually.

3. The dry isolation device of claim 2, further comprising: the second air blowing pipeline (70) is connected with the first air blowing pipeline (60) in parallel, and an air outlet of the second air blowing pipeline (70) is connected with the air outlet of the first isolation pipeline (20) and/or the air outlet of the second isolation pipeline (30); the second air blowing pipeline (70) comprises a pneumatic cut-off valve (701), a second check valve (702) and a second flow limiting orifice plate (703) which are sequentially connected from an air inlet of the second air blowing pipeline (70) to an air outlet of the second air blowing pipeline (70).

4. A dry isolation device according to claim 3, further comprising:

-a first gas source (100), the first gas source (100) being in communication with the inlet (101) for delivering flare gas to the knock-out tank (10);

and a second air source (200), wherein the second air source (200) is respectively communicated with the air inlet of the first air blowing pipeline (60) and the air inlet of the second air blowing pipeline (70) for conveying purge gas to the first air blowing pipeline (60) and the second air blowing pipeline (70).

5. The dry isolation device of claim 1, wherein the first isolation tube (20) comprises an equal caliber quick opening valve (201) and the second isolation tube (30) comprises a small caliber flame arrestor (301).

6. The dry isolation device of claim 5, further comprising:

a third isolation tube (80), an air inlet of the third isolation tube (80) being in communication with the outlet (102), the third isolation tube (80) being in parallel with the first isolation tube (20); the third isolation pipeline (80) comprises an equal caliber blasting needle valve (801) for performing pressure relief protection on the first isolation pipeline (20).

7. A dry isolation device according to claim 3, further comprising:

a temperature detection unit (90), wherein the temperature detection unit (90) is connected with the air outlet of the first isolation pipeline (20) and/or the second isolation pipeline (30) and is used for detecting the temperature of the flare gas flowing out of the liquid separation tank (10);

the temperature detection unit (90) is connected with the control unit (50), the control unit (50) is further configured to: the pneumatic shut-off valve (701) of the second blow line (70) is controlled to open in response to the temperature falling below a second temperature value from a first temperature value.

8. The dry isolation device of claim 7, wherein the control unit (50) is further configured to, after the control unit (50) controls the flow of flare gas from the first isolation conduit (20),:

controlling the pneumatic shut-off valve (701) of the second blow line (70) to open in response to the pressure being less than a second pressure value; wherein the second pressure value is less than the first pressure value.

9. The dry isolation device of claim 8, wherein the first pressure value ranges from 70 to 90kpa, the second pressure value ranges from 20 to 40kpa, the first temperature value ranges from 110 to 130 ℃, and the second temperature value ranges from 75 to 85 ℃; or alternatively

The range of the first pressure value is 10-20 kpa, the range of the second pressure value is 5-8 kpa, the range of the first temperature value is 110-130 ℃, and the range of the second temperature value is 75-85 ℃.

10. A dry insulation method applied to a dry insulation device according to any one of claims 1 to 9, the dry insulation method comprising the steps of:

acquiring the pressure of the flare gas entering the liquid separation tank (10);

controlling the flare gas with the pressure smaller than the first pressure value to flow out of the second isolation pipeline (30), and controlling the flare gas with the pressure larger than or equal to the first pressure value to flow out of the first isolation pipeline (20);

the liquid separating tank (10) comprises an inlet (101) and an outlet (102), and an air inlet of the first isolation pipeline (20) is connected with the outlet (102); an air inlet of a second isolation tube (30) is connected to the outlet (102) and is connected in parallel with the first isolation tube (20).

11. The dry isolation method of claim 10, further comprising:

providing a first blowing pipeline (60) and controlling the first blowing pipeline (60) to convey purge gas to the first isolation pipeline (20) and/or the second isolation pipeline (30); the air outlet of the first air blowing pipeline (60) is connected with the air inlet of the first isolation pipeline (20) and/or the air inlet of the second isolation pipeline (30).

12. The dry isolation method of claim 11, further comprising:

providing a second air blowing pipeline (70), wherein the second air blowing pipeline (70) is connected with the first air blowing pipeline in parallel, and an air outlet of the second air blowing pipeline (70) is connected with an air outlet of the first isolation pipeline (20) and/or the second isolation pipeline (30);

the temperature of the flare gas exiting the knock-out tank (10) is obtained and a pneumatic shut-off valve (701) of the second blow line (70) is controlled to open in response to the temperature decreasing from a first temperature value to below a second temperature value.

13. The dry isolation method of claim 12, further comprising:

controlling the pneumatic shut-off valve (701) of the second blow line (70) to open in response to the pressure being less than a second pressure value after controlling flare gas to flow out of the first isolation line (20); wherein the second pressure value is less than the first pressure value.

14. A flare system comprising a dry isolation device according to any one of claims 1 to 9.