Emptying system and control method thereof

Abstract

The invention relates to the technical field of oil and gas gathering and transportation, and provides an emptying system and a control method thereof, emptying gas is gathered through an emptying gas collecting manifold and then enters a liquid separation tank for gas-liquid separation, a separated gas phase enters a gas emptying pipeline, and a liquid phase enters a liquid drainage pipeline. When the low calorific value of the gas phase is greater than or equal to the lower limit of the low calorific value and the gas concentration is lower than the upper limit of the detonation concentration, the gas can be ignited and combusted immediately. And when the gas-phase low calorific value is smaller than the lower limit of the low calorific value, directly emptying without ignition. According to the system, on the premise that safety is guaranteed, instant re-combustion can be achieved after the combustion emptying head is extinguished. The blow-down system provided by the invention realizes automatic switching between combustion treatment and non-combustion direct blow-down, does not need to stop production for manual switching, and solves the problem that a torch and a cold blow-down device cannot be combined.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas gathering and transportation, and in particular to a venting system and a control method thereof. Background Art

[0002] Flaring or cold venting is a safety guarantee for oil and gas field gathering and transportation technology. It is to vent excess or unqualified gas directly by burning or not burning. Since the exploitation cycle of oil and gas fields is usually long and the sources of underground oil and gas resources are complex, the components of the produced oil and gas are variable.

[0003] In traditional designs, the method of setting up a flare and a cold venting device at the same time is usually used to treat combustible and non-combustible venting air. The combination of a flare and a cold venting device is simpler in terms of process flow and requires lower investment costs. However, according to the existing technology, if you want to switch between combustion treatment and direct cold venting without combustion, you will face the need for temporary production suspension, and manual switching by personnel is required during the shutdown period, resulting in a significant loss of oil and gas resource output and reduced production efficiency. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a venting system and a venting system control method, which aims to solve the problem in the related art that the flare and the cold venting device cannot be merged, and after the forced merger, the flare and the cold venting device need to be temporarily stopped and manually switched when switching.

[0005] The present invention provides a venting system, comprising a venting air collecting manifold, a venting air intake pipeline, a liquid separator, a gas venting pipeline, a drainage pipeline, an inert gas intake pipeline and a combustion venting head, wherein the venting air collecting manifold, the venting air intake pipeline, the liquid separator, the gas venting pipeline and the combustion venting head are connected in sequence, the upstream end of the drainage pipeline is connected to the bottom of the liquid separator, the downstream end of the inert gas intake pipeline is connected to a first point of the gas venting pipeline, and the first point is located near the combustion venting head, and the system is characterized in that it also includes a controller, and the controller includes:

[0006] A gas component analysis module, the gas component analysis module is used to obtain gas component information of the vented air at a second point and a third point of the gas venting pipeline, the second point is located between the first point and the liquid separator, and the third point is located between the first point and the combustion venting head;

[0007] A gas concentration acquisition module, which is used to acquire gas concentration information at multiple detection points in the surrounding environment;

[0008] A calculation module, the calculation module is in communication with the gas component analysis module, and the calculation module calculates the lower calorific value and the upper limit of the deflagration concentration of the discharged air based on the gas component information obtained by the gas component analysis module;

[0009] A control module, the control module being communicatively connected with the calculation module, the gas concentration acquisition module, the inert gas inlet pipeline and the combustion venting head;

[0010] When the control module receives a combustion venting instruction, the control module is used to control the combustion venting head to ignite the vent air when the lower calorific value of the vent air at the second point is greater than or equal to the lower limit of the lower calorific value and the maximum value of the gas concentration at multiple detection points in the surrounding environment is less than the upper limit of the deflagration concentration; or the control module is used to control the inert gas intake line to be turned on when the lower calorific value of the vent air at the second point is greater than or equal to the lower limit of the lower calorific value and the maximum value of the gas concentration at multiple detection points in the surrounding environment is higher than the upper limit of the deflagration concentration, until the maximum value of the gas concentration at multiple detection points in the surrounding environment is lower than the upper limit of the deflagration concentration and the lower calorific value of the vent air at the third point is greater than or equal to the lower limit of the lower calorific value, then control the combustion venting head to ignite the mixture of vent air and inert gas;

[0011] When the control module receives a cold venting instruction, the control module is used to control the inert gas intake pipeline to be turned on until the lower calorific value of the mixture of vent air and inert gas at the third point is lower than the lower calorific value lower limit, causing the combustion venting head to be extinguished.

[0012] The venting system provided according to the present invention also includes a test combustion pipeline, the upstream end of the test combustion pipeline is connected to the fourth point of the gas venting pipeline, and the fourth point is located between the first point and the second point, the test combustion pipeline is communicatively connected to the control module, when the lower calorific value of the vented air at the second point is greater than or equal to the lower limit of the lower calorific value, the control module controls the test combustion pipeline to be turned on, and controls the test combustion pipeline to be ignited for test combustion, so as to verify the flammability of the vented air before igniting the combustion vent head.

[0013] According to the venting system provided by the present invention, a first temperature sensor is provided on the combustion venting head, and the first temperature sensor is communicatively connected with the control module. The control module is used to obtain the temperature value of the first temperature sensor, and when the temperature value of the first temperature sensor is greater than or equal to a first temperature preset value, the control module determines that the combustion venting head is ignited successfully.

[0014] According to the venting system provided by the present invention, a first flow regulating valve and a first flow meter are arranged on the inert gas intake pipeline, and the first flow meter is communicatively connected with the control module. When the lower calorific value of the vented air at the second point is greater than or equal to the lower limit of the lower calorific value and the gas concentration of the vented air in the surrounding environment is greater than the upper limit of the deflagration concentration, or when the lower calorific value of the vented air at the third point is greater than or equal to the lower limit of the lower calorific value and the combustion venting head needs to be extinguished, the control module controls the first flow regulating valve to open and adjust the opening through the first flow meter.

[0015] According to the venting system provided by the present invention, a second flow regulating valve, a trial combustion head and a second flow meter are arranged on the trial combustion pipeline, and a second temperature sensor is also arranged on the trial combustion head. The second flow meter and the second temperature sensor are both communicatively connected with the control module. When the lower calorific value of the vented air at the second point is greater than or equal to the lower limit of the lower calorific value, the control module controls the second flow regulating valve to open and adjust the opening through the second flow meter, and when the temperature value detected by the second temperature sensor is greater than or equal to the second temperature preset value, the controller determines that the trial combustion head is successfully ignited.

[0016] According to the venting system provided by the present invention, the downstream end of the vent air intake pipeline and the upstream end of the gas venting pipeline are both connected to the top of the liquid separator tank.

[0017] According to the venting system provided by the present invention, the drainage pipeline is provided with a shut-off valve and a drainage booster pump.

[0018] The present invention also provides a venting system control method, which is implemented based on the venting system as described above, and the control method includes:

[0019] Obtaining first gas component information of the vented air at a second point of the gas venting pipeline, second gas component information of the vented air at a third point, and a gas concentration value of the vented air in the surrounding environment, and calculating a first lower calorific value of the vented air at the second point of the gas venting pipeline, an upper limit of the deflagration concentration of the vented air at the second point of the gas venting pipeline, and a second lower calorific value of the vented air at the third point of the gas venting pipeline based on the first gas component information and the second gas component information;

[0020] After receiving the cold idling to burning venting command, perform the following steps:

[0021] Determining that the first lower calorific value is greater than or equal to the lower limit of the lower calorific value and the gas concentration value of the vent air in the surrounding environment is lower than the upper limit of the deflagration concentration, controlling the combustion vent head to ignite the vent air;

[0022] Alternatively, it is determined that the first lower calorific value is greater than or equal to the lower limit of the lower calorific value and the gas concentration value of the vent air in the surrounding environment is higher than the upper limit of the deflagration concentration, the inert gas intake pipeline is controlled to be connected and the inert gas flow rate of the inert gas intake pipeline is adjusted, so that the second lower calorific value is greater than or equal to the lower limit of the lower calorific value and the gas concentration value of the vent air in the surrounding environment is lower than the upper limit of the deflagration concentration, and the combustion vent head is controlled to ignite the vent air;

[0023] After receiving the command to switch from combustion venting to cold venting, perform the following steps:

[0024] When it is determined that the combustion venting head is in a combustion state, the inert gas inlet pipeline is controlled to be connected and the inert gas flow rate of the inert gas inlet pipeline is adjusted until the combustion venting head is extinguished;

[0025] The flow rate of the gas venting pipeline is obtained, and when the flow rate of the gas venting pipeline is greater than zero, the inert gas intake pipeline is cut off; when the flow rate of the gas venting pipeline is equal to zero, the inert gas intake pipeline is kept in a conducting state.

[0026] According to the venting system control method provided by the present invention, before controlling the combustion venting head to ignite the venting air, it also includes determining that the test combustion head of the test combustion pipeline has been successfully ignited.

[0027] According to the venting system control method provided by the present invention, the controlling the inert gas inlet pipeline to be turned on and adjusting the inert gas flow rate of the inert gas inlet pipeline until the combustion venting head is extinguished includes:

[0028] Obtaining the temperature value of the combustion venting head and comparing it with the first temperature preset value;

[0029] When the temperature value of the combustion venting head is greater than the first temperature preset value, the flow rate of the inert gas inlet pipeline is continuously adjusted to increase the flow rate of the inert gas until the temperature value of the combustion venting head is less than the first temperature preset value, and it is determined that the combustion venting head is extinguished successfully.

[0030] The present invention adopts the above technical solution, which has the following advantages:

[0031] The venting system provided by the present invention has a first point, a second point, a third point and a fourth point distributed on the gas venting pipeline. The first point is the connection point between the inert gas intake pipeline and the gas venting pipeline, the second point is located between the first point and the liquid separator, the third point is located between the first point and the combustion venting head, and the fourth point is located between the first point and the second point. The gas component analysis module is used to obtain the gas component information of the vented air at the second point and the third point of the gas venting pipeline. The calculation module calculates the lower heating value of the vented air at the two points based on the gas component information of the vented air at the second point and the third point, and calculates the upper limit of the deflagration concentration of the vented air based on the gas component information of the vented air at the second point. The gas concentration acquisition module is used to obtain the gas concentration information of the vented air at multiple detection points in the surrounding environment. The control module is connected to the gas component analysis module, the gas concentration acquisition module, the inert gas intake pipeline and the combustion venting head in communication, and is used to receive the ignition venting instruction and the cold venting instruction. When the control module receives the combustion venting instruction, the control module is used to control the combustion venting head to ignite the venting air when the lower calorific value of the venting air at the second point is greater than or equal to the lower limit of the lower calorific value and the maximum value of the gas concentration at all detection points in the surrounding environment is less than the upper limit of the deflagration concentration, or the control module is used to control the inert gas intake pipeline to be turned on when the lower calorific value of the venting air at the second point is greater than or equal to the lower limit of the lower calorific value and the maximum value of the gas concentration at all detection points in the surrounding environment is higher than the upper limit of the deflagration concentration, until the gas concentration at all detection points in the surrounding environment is lower than the upper limit of the deflagration concentration, and then control the combustion venting head to ignite the mixture of venting air and inert gas. When the control module receives the cold venting instruction, the control module is used to control the inert gas intake pipeline to be turned on until the lower calorific value of the mixture of venting air and inert gas at the third point is lower than the lower limit of the lower calorific value so that the combustion venting head is extinguished. The venting system provided by the present invention can automatically calculate the flammability of the venting air upon receiving a combustion instruction and promptly ignite and burn the venting air when the gas phase meets the combustion requirements, and directly cold vent when the gas phase does not meet the combustion requirements. The venting system provided by the present invention can also mix inert gas into the venting air upon receiving a cold venting instruction, so that the gas phase does not meet the combustion requirements and is directly vented. The venting system provided by the present invention realizes automatic switching between combustion treatment and direct venting without combustion, without stopping production for manual switching, and solves the problem that the flare and cold venting devices cannot be combined.

[0032] Furthermore, in the venting system control method provided by the present invention, since the control method is implemented based on the above-mentioned venting system, it has the same advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of a venting system provided in one embodiment of the present invention.

[0035] Reference numerals:

[0036] 110: venting air collection manifold; 120: venting air intake pipeline; 130: liquid separator; 140: gas venting pipeline; 150: drainage pipeline; 151: shut-off valve; 152: drainage booster pump; 160: inert gas intake pipeline; 161: first flow regulating valve; 162: first flow meter; 163: shut-off valve; 170: combustion venting head; 171: first temperature sensor; 180: test combustion pipeline; 181: second flow regulating valve; 182: test combustion head; 183: second temperature sensor; 184: second flow meter;

[0037] 200: controller; 210: gas component analysis module; 2101: first gas component acquisition unit; 2102: second gas component acquisition unit; 220: gas concentration acquisition module; 2201: gas concentration acquisition unit; 230: calculation module; 240: control module;

[0038] A: the first point; B: the second point; C: the third point; D: the fourth point. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] The present invention provides a venting system, wherein the venting air enters a liquid separator through a venting air collecting manifold and a venting air inlet pipeline for gas-liquid separation, and the separated gas phase enters a gas venting pipeline, and the liquid phase enters a liquid discharge pipeline. When the calculation module determines that the venting air meets the combustion requirements, the control module can control the combustion venting head to instantly ignite and burn the venting air. When the calculation module determines that the gas phase does not meet the combustion requirements, it is directly vented without ignition. The venting system provided by the present invention realizes the instant switching between combustion treatment and direct venting without combustion, solving the problem that the flare and cold venting can only be set separately and cannot be combined due to the complex and changeable components in the current oil and gas field production process.

[0046] Combine the following Figure 1 The venting system of the present invention is described.

[0047] The present invention provides a venting system, including a venting air collecting manifold 110, a venting air intake pipeline 120, a liquid separator 130, a gas venting pipeline 140, a drainage pipeline 150, an inert gas intake pipeline 160, a combustion venting head 170 and a controller 200. The controller 200 includes a gas component analysis module 210, a gas concentration acquisition module 220, a calculation module 230 and a control module 240.

[0048] The upstream of the vent air collection manifold 110 is connected to each discharge pipeline in the oil and gas field, the downstream of the vent air collection manifold 110 is connected to the upstream of the vent air intake pipeline 120, the downstream of the vent air intake pipeline 120 is connected to the liquid separator 130, the upstream of the gas vent pipeline 140 is connected to the liquid separator 130, and the downstream end of the gas vent pipeline 140 is connected to the combustion vent header 170. The downstream of the inert gas intake pipeline 160 is connected to the first point A of the gas vent pipeline 140, and the first point A is located on the gas vent pipeline 140 near the combustion vent header 170. The upstream of the drainage pipeline 150 is connected to the liquid separator 130, and the downstream of the drainage pipeline 150 goes to the production system.

[0049] Among them, the vent air collection manifold 110 is used to collect vent air from various equipment and facilities in the oil and gas field, the vent air inlet pipeline 120 is used to lead the vent air collected by the vent air collection manifold 110 to the separator tank 130, the separator tank 130 is used to separate the vent air into gas and liquid, the gas vent line 140 is used to send the gas phase of the separated vent air to the combustion vent header 170, the combustion vent header 170 is used to burn the vent air or directly cold vent it without combustion, and the discharge pipeline 150 is used to send the liquid separated in the separator tank 130 to the production system.

[0050] The gas component analysis module 210 includes two gas component collection units. The first gas component collection unit 2101 is connected to the second point B of the gas venting pipeline 140, and the second point B is located between the first point A and the liquid separator 130. The second gas component collection unit 2102 is connected to the third point C of the gas venting pipeline 140, and the third point C is located between the first point A and the combustion venting head 170.

[0051] The gas concentration acquisition module 220 includes at least one gas concentration acquisition unit 2201, and multiple gas concentration acquisition units 2201 are distributed around the venting system. The calculation module 230 is connected to the gas component analysis module 210, and the control module 240 is connected to the calculation module 230, the gas concentration acquisition module 220, the inert gas inlet pipeline 160 and the combustion venting head 170.

[0052] Among them, the first gas component acquisition unit 2101 is used to obtain the gas component of the vented air at the second point B, and the second gas component acquisition unit is used to obtain the gas component of the vented air at the third point C. The calculation module 230 is used to calculate the lower heating value of the vented air at the second point B and the upper limit of the deflagration concentration of the vented air according to the gas component of the vented air at the second point B, and calculate the lower heating value of the vented air at the third point C according to the gas component of the vented air at the third point C. The gas concentration acquisition unit 2201 of the gas concentration acquisition module 220 is used to obtain the gas concentration of the vented air at the corresponding detection point in the surrounding environment of the venting system.

[0053] When the control module 240 receives the combustion venting instruction, the control module 240 compares the lower calorific value of the vent air at the second point B with the lower limit of the lower calorific value, and determines that the vent air is combustible when the lower calorific value of the vent air at the second point B is greater than or equal to the lower limit of the lower calorific value, and then compares the maximum value of the gas concentration at multiple detection points in the surrounding environment with the upper limit of the deflagration concentration, and determines that the vent air can be safely burned when the maximum value of the gas concentration at multiple detection points in the surrounding environment is lower than the upper limit of the deflagration concentration, and at this time controls the combustion venting head 170 to ignite the vent air.

[0054] When the control module 240 receives the combustion venting instruction, the control module 240 compares the lower calorific value of the vent air at the second point B with the lower limit of the lower calorific value, and determines that the vent air is combustible when the lower calorific value of the vent air at the second point B is greater than or equal to the lower limit of the lower calorific value, and then compares the maximum value of the gas concentration at multiple detection points in the surrounding environment with the upper limit of the deflagration concentration, and determines that there is a risk of deflagration overpressure when the vent air is ignited when the maximum value of the gas concentration at multiple detection points in the surrounding environment is higher than the upper limit of the deflagration concentration, and then controls the inert gas intake line 160 to be turned on, and adjusts the inert gas flow rate of the inert gas intake line 160 until the maximum value of the gas concentration at multiple detection points in the surrounding environment is lower than the upper limit of the deflagration concentration, and then controls the combustion venting head 170 to ignite the mixture of the vent air and the inert gas.

[0055] When the control module 240 receives the combustion venting instruction, the control module 240 compares the lower calorific value of the vented air at the second point B with the lower limit of the lower calorific value. When the lower calorific value of the vented air at the second point B is less than the lower limit of the lower calorific value, it is determined that the vented air is non-flammable and cold venting continues.

[0056] When the control module 240 receives the cold venting instruction, the control module 240 controls the inert gas intake pipeline 160 to be turned on until the lower calorific value of the mixture of vent air and inert gas at the third point C is lower than the lower calorific value limit, at which time the combustion venting head 170 is extinguished.

[0057] The venting system provided by the present invention can realize automatic control of combustion venting and non-combustion direct cold venting, and there is no need to stop production to manually switch the flare and cold venting equipment, thus realizing the combination of the flare and the cold venting equipment.

[0058] In some embodiments of the present invention, a test combustion pipeline 180 is further connected to the gas venting pipeline 140, and the upstream end of the test combustion pipeline 180 is connected to the fourth point D of the gas venting pipeline 140, and the fourth point D is located between the first point A and the second point B. The test combustion pipeline 180 is in communication connection with the control module 240. When the lower calorific value of the vented air at the second point B is greater than or equal to the lower limit of the lower calorific value, the control module 240 controls the test combustion pipeline 180 to be turned on, adjusts the opening of the test combustion pipeline 180, and then controls the test combustion pipeline 180 to be ignited for trial combustion to verify the flammability of the vented air.

[0059] Specifically, the upstream end of the test combustion pipeline 180 is connected to the fourth point D of the gas venting pipeline 140, and the fourth point D is located after the second point B and before the first point A. When the lower heating value of the vented air at the second point B is greater than or equal to the lower limit of the lower heating value, the control module 240 determines that the vented air is theoretically flammable, and then controls the test combustion pipeline 180 to be turned on and adjusts the flow of the test combustion pipeline 180, and then performs a test combustion ignition to further verify the true flammability of the vented air.

[0060] If the trial ignition fails, the vent air will continue to be cold vented. If the trial ignition is successful and the maximum value of the vent air gas concentration at multiple detection points in the surrounding environment is less than the upper limit of the deflagration concentration, the controller can control the combustion vent head 170 to ignite.

[0061] In some embodiments of the present invention, a first temperature sensor 171 is disposed on the combustion venting head 170 , and the first temperature sensor 171 is communicatively connected to the control module 240 .

[0062] The first temperature sensor 171 is used to collect the temperature value of the combustion and venting head 170 and transmit the temperature value to the control module 240. After the combustion and venting head 170 ignites and vents air, the temperature of the combustion and venting head 170 rises sharply. When the temperature value transmitted back to the control module 240 by the first temperature sensor 171 is greater than the first temperature preset value, it means that the combustion and venting head 170 has ignited and vented air. At this time, the control module 240 determines that the combustion and venting head 170 has been ignited successfully, otherwise it determines that the combustion and venting head 170 has failed to ignite.

[0063] In some embodiments of the present invention, a first flow regulating valve 161 and a first flow meter 162 are disposed on the inert gas inlet pipeline 160 . The first flow meter 162 is communicatively connected to the control module 240 , and the first flow meter 162 is communicatively connected to the first flow regulating valve 161 .

[0064] The first flow regulating valve 161 is used to control the on-off of the inert gas intake pipeline 160 and adjust the intake flow rate of the inert gas. The first flow meter 162 is in communication with the control module 240, and the control module 240 controls the on-off of the first flow regulating valve 161 through the first flow meter 162, and adjusts the opening of the first flow regulating valve 161 to change the intake flow rate of the inert gas of the inert gas intake pipeline 160.

[0065] When the lower calorific value of the vent air at the second point B is greater than or equal to the lower limit of the lower calorific value, it means that the vent air is flammable. At this time, the control module 240 obtains the gas concentration of the vent air in the surrounding environment collected by the gas concentration collection unit 2201, and selects the maximum value of multiple gas concentration values ​​for comparison with the upper limit of the deflagration concentration. When the maximum value of the gas concentration is lower than the upper limit of the deflagration concentration, it means that the vent air can burn safely. When the maximum value of the gas concentration is higher than the upper limit of the deflagration concentration, it means that there is a risk of deflagration overpressure when igniting the vent air at this time.

[0066] In this way, when the lower calorific value of the vent air at the second point B is greater than or equal to the lower limit of the lower calorific value, the control module 240 compares the maximum value of the gas concentration of the vent air at multiple detection points in the surrounding environment with the upper limit of the deflagration concentration. When the maximum value of the gas concentration is higher than the upper limit of the deflagration concentration, the control module 240 controls the first flow regulating valve 161 to open through the first flow meter 162, so that the inert gas intake pipeline 160 is connected, and inert gas is transported into the gas venting pipeline 140 to reduce the gas concentration of the vent air. When the vent air mixed with inert gas is refrigerated and vented, the gas concentration of the vent air at each detection point in the surrounding environment will be reduced to below the lower limit of the deflagration concentration.

[0067] At this time, the control module 240 compares the maximum value of the gas concentration of the vented air in the surrounding environment with the upper limit of the deflagration concentration in real time, and at the same time compares the lower calorific value of the gas at the third point C with the lower limit of the lower calorific value. The control module 240 adjusts the opening of the first flow control valve 161 in real time according to the comparison result until the maximum value of the gas concentration of the vented air in the surrounding environment is lower than the upper limit of the deflagration concentration, and ensures that the lower calorific value of the gas at the third point C is not lower than the lower limit of the lower calorific value.

[0068] In some embodiments of the present invention, a second flow regulating valve 181, a trial combustion head 182 and a second flow meter 184 are provided on the trial combustion pipeline 180, and a second temperature sensor 183 is provided on the trial combustion head 182. The second flow meter 184 and the second temperature sensor 183 are both communicatively connected to the control module 240.

[0069] The second flow regulating valve 181 is used to control the on-off of the test combustion pipeline 180 and adjust the intake flow rate of the air discharged in the test combustion pipeline 180. The second flow meter 184 is in communication connection with the control module 240, and the control module 240 controls the on-off of the second flow regulating valve 181 through the second flow meter 184, and adjusts the opening of the second flow regulating valve 181 to change the intake flow rate of the air discharged in the test combustion pipeline 180.

[0070] When the lower calorific value of the exhaust air at the second point B is greater than or equal to the lower limit of the lower calorific value, it means that the exhaust air is theoretically flammable. At this time, the control module 240 controls the conduction of the second flow regulating valve 181 and controls the opening of the second flow regulating valve 181 through the second flow meter 184, and then further controls the test combustion head 182 to ignite the test combustion.

[0071] The second temperature sensor 183 is used to collect the temperature value of the test combustion head 182 and transmit the temperature value to the control module 240. When the test combustion head 182 burns, the temperature rises sharply. Therefore, when the temperature value received by the control module 240 is greater than the second preset temperature, it is determined that the test combustion head 182 is successfully ignited, otherwise it is determined that the test combustion head 182 fails to ignite.

[0072] In some embodiments of the present invention, the downstream end of the vent air intake pipeline 120 and the upstream end of the gas vent pipeline 140 are both connected to the top of the liquid separator tank 130 , and the upstream end of the liquid discharge pipeline 150 is connected to the bottom of the liquid separator tank 130 .

[0073] Since the density of gas is less than that of liquid, gas rises and liquid falls. Therefore, the downstream end of the venting air inlet pipeline 120 and the upstream end of the gas venting pipeline 140 are both connected to the top of the liquid separator 130, and the venting air enters the gas venting pipeline 140 from the top of the liquid separator 130. The upstream end of the liquid discharge pipeline 150 is connected to the bottom of the liquid separator 130, and the separated liquid enters the liquid discharge pipeline 150 at the bottom of the liquid separator 130.

[0074] In some embodiments of the present invention, a shut-off valve 151 and a drain booster pump 152 are provided on the drain pipeline 150. The shut-off valve 151 is used to control the on-off of the drain pipeline 150, and the drain booster pump 152 is used to pressurize and discharge the separated liquid.

[0075] The venting system control method provided by the present invention is described below. The venting system control method described below and the venting system described above can be referenced to each other.

[0076] An embodiment of the present invention provides a venting system control method, comprising the following steps:

[0077] Step S100, obtaining the first gas component information of the vent air at the second point B of the gas vent pipeline 140, the second gas component information of the vent air at the third point C, and the gas concentration value of the vent air in the surrounding environment, and calculating the first lower calorific value of the vent air at the second point B of the gas vent pipeline 140, the upper limit of the deflagration concentration of the vent air at the second point B of the gas vent pipeline 140, and the second lower calorific value of the vent air at the third point C of the gas vent pipeline 140 based on the first gas component information and the second gas component information.

[0078] Specifically, the control method is executed by a controller, which includes a gas component analysis module 210 , a gas concentration acquisition module 220 , a calculation module 230 and a control module 240 .

[0079] The gas component analysis module 210 obtains the first gas component information of the vented air at the second point B, the calculation module 230 receives the first gas component information and calculates the first lower heating value and the upper limit of the deflagration concentration of the vented air at the second point B, and the gas component analysis module 210 also obtains the second gas component information of the vented air at the third point C, and the calculation module 230 receives the second gas component information and calculates the second lower heating value of the vented air at the third point C. The gas concentration acquisition module 220 is used to obtain the gas concentration of the vented air at multiple detection points in the surrounding environment.

[0080] Step S200, receiving a control instruction, and when confirming that the received control instruction is a cold idling combustion venting instruction, executing step S300 or step S400, wherein:

[0081] Step S300, determine that the first lower calorific value is greater than or equal to the lower limit of the lower calorific value and the gas concentration value in the surrounding environment is lower than the upper limit of the deflagration concentration, and control the combustion venting head 170 to ignite the venting air.

[0082] Specifically, when the control module 240 receives the cold idling combustion venting instruction, the control module 240 first compares the first lower calorific value at the second point B with the lower limit of the lower calorific value to determine whether the venting air in the gas venting pipeline 140 is theoretically combustible. When the first lower calorific value is greater than or equal to the lower limit of the lower calorific value, it means that the venting air at this time is theoretically combustible.

[0083] Then the control module 240 compares the maximum value of the gas concentration of the exhaust air at each detection point in the surrounding environment with the upper limit of the deflagration concentration. When the maximum value of the gas concentration is lower than the upper limit of the deflagration concentration, it indicates that the exhaust air can be burned safely at this time.

[0084] Based on the above determination results, the control module controls the combustion venting head 170 to ignite and vent air.

[0085] Step S400, determine that the first lower calorific value is greater than or equal to the lower limit of the lower calorific value and the gas concentration value of the vent air at at least one detection point in the surrounding environment is higher than the upper limit of the deflagration concentration, control the inert gas intake line 160 to be conductive and adjust the inert gas flow rate of the inert gas intake line 160, make the second lower calorific value greater than or equal to the lower limit of the lower calorific value and make the gas concentration value lower than the upper limit of the deflagration concentration, and control the combustion vent head 170 to ignite the vent air.

[0086] Specifically, when the control module 240 receives the cold idling combustion venting instruction, the control module 240 first compares the first lower calorific value at the second point B with the lower limit of the lower calorific value to determine whether the venting air in the gas venting pipeline 140 is theoretically combustible. When the first lower calorific value is greater than or equal to the lower limit of the lower calorific value, it means that the venting air at this time is theoretically combustible.

[0087] Then the control module 240 compares the maximum value of the gas concentration of the vent air at each detection point in the surrounding environment with the upper limit of the deflagration concentration. When the maximum value of the gas concentration at each detection point in the surrounding environment is higher than the upper limit of the deflagration concentration, it indicates that there is a risk of deflagration overpressure in the vent air ignition at this time.

[0088] Based on the above determination results, the control module 240 controls the inert gas inlet pipeline 160 to be turned on and adjusts the inert gas flow rate of the inert gas inlet pipeline 160. Then, the control module 240 compares the gas concentration at each detection point with the upper limit of the deflagration concentration in real time, and at the same time compares the second lower calorific value of the gas at the third point C with the lower limit of the lower calorific value. The control module 240 adjusts the opening of the first flow regulating valve 161 in real time according to the comparison result until the gas concentration at all detection points in the surrounding environment is lower than the upper limit of the deflagration concentration, and the second lower calorific value of the gas at the third point C is not lower than the lower limit of the lower calorific value, so as to ensure that the exhaust air is combustible under the premise of ensuring safety.

[0089] Step S500, receiving a control instruction, and when confirming that the received control instruction is a combustion venting to cooling venting instruction, executing steps S600 to S700.

[0090] Step S600: When it is determined that the combustion venting head 170 is in a combustion state, the inert gas inlet pipeline 160 is controlled to be conductive and the inert gas flow rate of the inert gas inlet pipeline 160 is adjusted until the combustion venting head 170 is extinguished.

[0091] Step S700, obtaining the flow rate of the gas venting pipeline 140, and when the flow rate of the gas venting pipeline 140 is greater than zero, cutting off the inert gas intake pipeline 160, and when the flow rate of the gas venting pipeline 140 is equal to zero, keeping the inert gas intake pipeline 160 in a conducting state.

[0092] Specifically, the controller further includes a first temperature sensor 171, which is used to detect the temperature of the combustion venting head 170. When the control module 240 receives the combustion venting to cold venting instruction, it first obtains the temperature value of the first temperature sensor 171. When the temperature value of the first temperature sensor 171 is greater than the first temperature preset value, it indicates that the combustion venting head 170 is in a combustion state. At this time, the control module 240 controls the inert gas inlet pipeline 160 to be turned on, so that the inert gas enters the gas venting pipeline 140 and mixes with the venting air, thereby reducing the low calorific value of the venting air.

[0093] If the temperature value of the first temperature sensor 171 is less than the first temperature preset value, it means that the combustion venting head 170 is in an extinguished state. At this time, it is determined that the instruction received by the control module 240 is incorrect.

[0094] The control module 240 compares the second lower calorific value of the mixture of the vent air and the inert gas at the third point C with the lower limit of the lower calorific value in real time, and adjusts the opening of the first flow control valve 161 in real time according to the comparison result until the second lower calorific value at the third point C is lower than the lower limit of the lower calorific value, so that the mixture of the vent air and the inert gas is non-flammable.

[0095] When the combustion venting head 170 is extinguished, the flow rate of the gas venting pipeline 140 needs to be obtained. When the flow rate of the gas venting pipeline 140 is greater than zero, the inert gas intake pipeline 160 can be cut off. When the flow rate of the gas venting pipeline 140 is equal to zero, the inert gas intake pipeline 160 needs to be kept in a conductive state. In this way, air backflow into the system can be prevented.

[0096] Specifically, when the inert gas inlet pipeline 160 needs to be cut off, the control module 240 can control the opening of the first flow regulating valve 161 to be zero through the first flow meter 162, or the control module 240 can directly control the shut-off valve 163 to be closed.

[0097] In some embodiments of the present invention, the following steps are further included before controlling the combustion venting head 170 to ignite the venting air:

[0098] Step S800, determining that the trial combustion head 182 of the trial combustion pipeline 180 is successfully ignited.

[0099] Specifically, before igniting the combustion head, the control module 240 can first control the test combustion pipeline 180 to be turned on, and control the test combustion head 182 to ignite a test combustion, so as to further verify the flammability of the vented air and the safety of combustion, and then ignite the combustion vent head 170 after confirming that it can burn safely.

[0100] The controller also includes a second temperature sensor 183, which is used to collect the temperature of the test combustion head 182. When the temperature value of the second temperature sensor 183 received by the control module is greater than or equal to the second temperature preset value, it indicates that the test combustion is successful, otherwise it is judged as a failure.

[0101] In some embodiments of the present invention, controlling the conduction of the inert gas inlet pipeline 160 and adjusting the inert gas flow rate of the inert gas inlet pipeline 160 until the combustion venting head 170 is extinguished includes the following steps:

[0102] Step S900, obtaining the temperature value of the combustion venting head 170 and comparing it with the first temperature preset value;

[0103] Step S1000, when the temperature value of the combustion venting head 170 is greater than the first temperature preset value, continue to adjust the flow of the inert gas inlet pipeline 160 to increase the flow of the inert gas until the temperature value of the combustion venting head 170 is less than the first temperature preset value, and determine that the combustion venting head 170 is extinguished successfully.

[0104] Specifically, when the second lower calorific value of the vent air at the third point C is lower than the lower limit of the lower calorific value, the vent air is theoretically non-flammable. At this time, the control module 240 can obtain the temperature value detected by the first temperature sensor 171 on the combustion vent head 170, and compare it with the first temperature preset value to further determine whether the combustion vent head 170 has been extinguished.

[0105] When the temperature value detected by the first temperature sensor 171 is still greater than the first temperature preset value, it means that the combustion head is not extinguished at this time. Continue to increase the opening of the first flow control valve 161 to increase the flow of the inert gas until the temperature value detected by the first temperature sensor 171 is less than the first temperature preset value, which indicates that the combustion venting head 170 is extinguished successfully.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A venting system, comprising a venting air collecting manifold (110), a venting air inlet pipeline (120), a separator tank (130), a gas venting pipeline (140), a drain pipeline (150), an inert gas inlet pipeline (160) and a combustion venting head (170), wherein the venting air collecting manifold (110), the venting air inlet pipeline (120), the separator tank (130), the gas venting pipeline (140) and the combustion venting head (170) are connected in sequence, the upstream end of the drain pipeline (150) is connected to the bottom of the separator tank (130), the downstream end of the inert gas inlet pipeline (160) is connected to a first point (A) of the gas venting pipeline (140), and the first point (A) is located near the combustion venting head (170), characterized in that: The device also includes a controller (200), wherein the controller (200) includes: a gas component analysis module (210), the gas component analysis module (210) being used to obtain gas component information of vented air at a second point (B) and a third point (C) of the gas venting pipeline (140), the second point (B) being located between the first point (A) and the liquid separator (130), and the third point (C) being located between the first point (A) and the combustion venting head (170); A gas concentration acquisition module (220), the gas concentration acquisition module (220) being used to acquire gas concentration information at a plurality of detection points in the surrounding environment; a calculation module (230), the calculation module (230) being in communication connection with the gas component analysis module (210), the calculation module (230) calculating the lower calorific value and the upper limit of the deflagration concentration of the exhaust air based on the gas component information acquired by the gas component analysis module (210); a control module (240), the control module (240) being communicatively connected with the calculation module (230), the gas concentration acquisition module (220), the inert gas intake pipeline (160), and the combustion venting head (170); When the control module (240) receives a combustion venting instruction, the control module (240) is used to control the combustion venting head (170) to ignite the vent air when the lower calorific value of the vent air at the second point (B) is greater than or equal to the lower limit of the lower calorific value and the maximum value of the gas concentration at multiple detection points in the surrounding environment is less than the upper limit of the deflagration concentration, or the control module (240) is used to control the inert gas intake pipeline (160) to be turned on when the lower calorific value of the vent air at the second point (B) is greater than or equal to the lower limit of the lower calorific value and the maximum value of the gas concentration at multiple detection points in the surrounding environment is higher than the upper limit of the deflagration concentration, until the maximum value of the gas concentration at multiple detection points in the surrounding environment is lower than the upper limit of the deflagration concentration and the lower calorific value of the vent air at the third point (C) is greater than or equal to the lower limit of the lower calorific value, then control the combustion venting head (170) to ignite the mixture of vent air and inert gas; When the control module (240) receives a cold venting instruction, the control module (240) is used to control the inert gas intake pipeline (160) to be turned on until the lower calorific value of the mixture of vent air and inert gas at the third point (C) is lower than the lower calorific value lower limit, causing the combustion venting head (170) to extinguish.

2. The venting system according to claim 1, characterized in that: It also includes a test combustion pipeline (180), the upstream end of which is connected to the fourth point (D) of the gas venting pipeline (140), and the fourth point (D) is located between the first point (A) and the second point (B). The test combustion pipeline (180) is communicatively connected to the control module (240). When the lower calorific value of the vented air at the second point (B) is greater than or equal to the lower limit of the lower calorific value, the control module (240) controls the test combustion pipeline (180) to be turned on, and controls the test combustion pipeline (180) to be ignited for test combustion, so as to verify the flammability of the vented air before igniting the combustion venting head (170).

3. The venting system according to claim 2, characterized in that: The combustion venting head (170) is provided with a first temperature sensor (171), the first temperature sensor (171) is communicatively connected with the control module (240), the control module (240) is used to obtain a temperature value of the first temperature sensor (171), and when the temperature value of the first temperature sensor (171) is greater than or equal to a first temperature preset value, the control module (240) determines that the combustion venting head (170) is ignited successfully.

4. The venting system according to claim 3, characterized in that: The inert gas inlet pipeline (160) is provided with a first flow regulating valve (161) and a first flow meter (162). The first flow meter (162) is in communication connection with the control module (240). When the lower calorific value of the vented air at the second point (B) is greater than or equal to the lower limit of the lower calorific value and the gas concentration of the vented air in the surrounding environment is greater than the upper limit of the deflagration concentration, or when the lower calorific value of the vented air at the third point (C) is greater than or equal to the lower limit of the lower calorific value and the combustion vent head (170) needs to be extinguished, the control module (240) controls the first flow regulating valve (161) to open and adjust the opening through the first flow meter (162).

5. The venting system according to claim 4, characterized in that: The test combustion pipeline (180) is provided with a second flow regulating valve (181), a test combustion head (182) and a second flow meter (184); the test combustion head (182) is also provided with a second temperature sensor (183); the second flow meter (184) and the second temperature sensor (183) are both communicatively connected with the control module (240); when the lower calorific value of the exhaust air at the second point (B) is greater than or equal to the lower limit of the lower calorific value, the control module (240) controls the second flow regulating valve (181) to open and adjust the opening through the second flow meter (184); and when the temperature value detected by the second temperature sensor (183) is greater than or equal to the second temperature preset value, the controller (200) determines that the test combustion head (182) is ignited successfully.

6. The venting system according to claim 5, characterized in that: The downstream end of the vent air intake pipeline (120) and the upstream end of the gas vent pipeline (140) are both connected to the top of the liquid separation tank (130).

7. The venting system according to claim 6, characterized in that: The liquid discharge pipeline (150) is provided with a shut-off valve (151) and a liquid discharge booster pump (152).

8. A venting system control method, characterized in that: Based on the venting system according to any one of claims 5 to 7, the control method includes: Obtaining first gas component information of the vented air at a second point (B) of the gas venting pipeline (140), second gas component information of the vented air at a third point (C), and a gas concentration value of the vented air in the surrounding environment, and calculating a first lower calorific value of the vented air at the second point (B) of the gas venting pipeline (140), an upper limit of the deflagration concentration of the vented air at the second point (B) of the gas venting pipeline (140), and a second lower calorific value of the vented air at the third point (C) of the gas venting pipeline (140) based on the first gas component information and the second gas component information; After receiving the cold idling to burning venting command, perform the following steps: Determining that the first lower calorific value is greater than or equal to the lower calorific value limit and the gas concentration value of the vent air in the surrounding environment is lower than the upper limit of the deflagration concentration, and controlling the combustion vent head (170) to ignite the vent air; Alternatively, it is determined that the first lower calorific value is greater than or equal to the lower limit of the lower calorific value and the gas concentration value of the vent air in the surrounding environment is higher than the upper limit of the deflagration concentration, the inert gas inlet pipeline (160) is controlled to be conductive and the inert gas flow rate of the inert gas inlet pipeline (160) is adjusted to make the second lower calorific value greater than or equal to the lower limit of the lower calorific value and the gas concentration value of the vent air in the surrounding environment is lower than the upper limit of the deflagration concentration, and the combustion vent head (170) is controlled to ignite the vent air; After receiving the command to switch from combustion venting to cold venting, perform the following steps: When it is determined that the combustion venting head (170) is in a combustion state, the inert gas inlet pipeline (160) is controlled to be open and the inert gas flow rate of the inert gas inlet pipeline (160) is adjusted until the combustion venting head (170) is extinguished; The flow rate of the gas venting pipeline (140) is obtained, and when the flow rate of the gas venting pipeline (140) is greater than zero, the inert gas intake pipeline (160) is cut off; when the flow rate of the gas venting pipeline (140) is equal to zero, the inert gas intake pipeline (160) is kept in a conducting state.

9. The venting system control method according to claim 8, characterized in that: Before controlling the combustion venting head (170) to ignite the venting air, it also includes determining that the trial combustion head (182) of the trial combustion pipeline (180) is successfully ignited.

10. The venting system control method according to claim 8 or 9, characterized in that: The controlling of the inert gas inlet pipeline (160) to be turned on and adjusting the inert gas flow rate of the inert gas inlet pipeline (160) until the combustion venting head is extinguished comprises: Acquire the temperature value of the combustion venting head (170) and compare it with a first temperature preset value; When the temperature value of the combustion venting head (170) is greater than a first temperature preset value, the flow rate of the inert gas inlet pipeline (160) is continuously adjusted to increase the flow rate of the inert gas until the temperature value of the combustion venting head (170) is less than the first temperature preset value, and it is determined that the combustion venting head (170) is extinguished successfully.

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