A method of oil and gas recovery conditioning

Abstract

The present application relates to oil and gas recovery technical field, disclose a kind of oil and gas recovery adjustment method, step 1, by loading monitoring management system monitoring the loading number of upper loading tank car and bottom loading tank car, step 2, according to loading flow adjustment fan air volume, loading flow: air volume=1:(1~1.2), loading flow=upper loading loading number*upper loading average flow+bottom loading loading number*bottom loading average flow;Step 3, when loading flow is 0, stop the compressor of oil and gas treatment equipment and open reflux regulating valve, fan runs 15 minutes and enters standby state;Wherein, fan is inhaled and transported to oil and gas treatment equipment by air inlet pipe containing oil and gas, and air inlet pipe is connected with the exhaust pipe of oil and gas treatment equipment, and reflux pipe is provided with reflux regulating valve on the reflux pipe;The present application can meet the different working conditions oil gas collection needs when single tank car and multiple tank cars are filled with oil, effectively defrosting treatment is carried out to oil and gas treatment equipment, and the operating stability of equipment is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil gas recovery, in particular to an oil gas recovery adjusting method. BACKGROUND

[0002] Petroleum storage contains a large amount of flammable and explosive substances, and these substances are transported to gas stations or factories as fuel or raw materials through tank trucks. During this loading process, a large amount of oil gas will be volatilized, which needs to be recovered by an oil gas recovery device to avoid pollution to the atmospheric environment.

[0003] Tank trucks can be divided into top-loading tank trucks and bottom-loading tank trucks according to the loading method. The bottom-loading tank truck can realize closed loading, and the oil gas generated during loading can be transported to the oil gas recovery equipment through the oil gas recovery pipeline for recovery treatment. According to the requirements of relevant national standards, gasoline loading must use bottom-loading tank trucks. However, there is no mandatory requirement for other types at present, so there are still a certain number of top-loading tank trucks for other volatile oil products and chemical products on the market. Due to the above reasons, the oil gas recovery system of some oil depots has both bottom-loading tank trucks and top-loading tank trucks.

[0004] However, the existing loading port of the top-loading tank truck does not have a unified standard, and cannot achieve good sealing with the crane pipe. During loading, part of the oil gas will leak into the atmosphere; these oil gas leaked into the environment pollutes the environment, poses a safety risk, and also affects the occupational health of the on-site operators. Although some equipment has added an induced draft fan, the control of the induced draft fan is unreasonable, and cannot meet the different working conditions of single-tank loading and multi-tank simultaneous loading. If the air volume is too small, it will cause oil gas to escape on site; if the air volume is too large, it will cause waste of electric energy and increase of oil gas loss during loading.

[0005] Moreover, since the oil gas contains a small amount of water vapor, the water vapor will condense into frost or ice on the heat exchange fins in a low-temperature environment, affecting the heat exchange effect and blocking the passage, affecting the normal operation of the equipment. The existing technology usually uses double channels to solve the problem, one channel is in operation, and the other channel uses the heat of the refrigerant to melt the frost, but in actual practice, this effect is not ideal, and the equipment will have a large pressure difference after a period of operation. SUMMARY

[0006] The purpose of the present application is to provide an oil gas recovery adjusting method that meets the oil gas collection needs of different working conditions of single-tank and multi-tank loading, effectively melts the frost of the oil gas treatment equipment, and effectively improves the operation stability of the equipment.

[0007] In order to achieve the above-mentioned purpose, the present application provides an oil gas recovery adjusting method, comprising the following steps:

[0008] Step 1, monitoring the number of loading tank trucks of the top-loading tank truck and the bottom-loading tank truck through the loading monitoring and management system,

[0009] Step 2, adjust the fan air volume according to the loading flow,

[0010] Loading flow: air volume = 1: (1-1.2),

[0011] Loading flow = upper loading loading quantity * upper loading average flow + bottom loading loading quantity * bottom loading average flow;

[0012] Step 3, when the loading flow is 0, stop the compressor of the oil gas treatment equipment and open the backflow regulating valve, and the fan runs for 15 minutes and enters the standby state; wherein the fan sucks and transports the air containing oil gas to the oil gas treatment equipment through the air inlet pipe, and the backflow pipe is connected between the air inlet pipe and the exhaust pipe of the oil gas treatment equipment, and the backflow regulating valve is arranged on the backflow pipe.

[0013] As a preferred scheme of the application, the upper loading average flow is 80m 3 / h; the bottom loading average flow is 120m 3 / h.

[0014] As a preferred scheme of the application, in step 3, when the loading is to the last tank car of the day, the compressor of the oil gas treatment equipment is stopped, the backflow regulating valve is opened, and the fan runs until the pressure difference before and after the heat exchanger of the oil gas treatment equipment is reduced to a set value, and then the fan enters the standby state.

[0015] As a preferred scheme of the application, in step 3, the air volume of the fan is 30% of the rated air volume of the fan.

[0016] Compared with the prior art, the oil gas recovery adjusting method of the embodiment of the application has the following beneficial effects:

[0017] The application can adjust the air volume of the fan according to the actual type (upper loading tank car and bottom loading tank car) and the number of loading tank cars, ensure that the air volume is reasonable, meet the actual working condition requirements, ensure that the oil gas can be completely recovered to the oil gas treatment equipment for treatment, avoid excessive air volume and cause loading oil loss, optimize the oil gas treatment process, avoid oil gas volatilization into the atmosphere to cause environmental pollution, reduce on-site oil gas volatilization, and be beneficial to the occupational health of the operating personnel; and during the non-loading period, the compressor is stopped and the backflow pipe and the fan are used for circulating air blowing, the defrosting of the heat exchanger of the oil gas treatment equipment is performed by air heat exchange, and the problem of the influence of the heat exchanger frosting on the system can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the application, the drawings of the embodiment will be briefly introduced below.

[0019] Figure 1 is a structural schematic diagram of an oil gas recovery system provided by the present application;

[0020] In the figure, 1 is a fan; 2 is an oil gas treatment device; 3 is a backflow pipe; 4 is a backflow regulating valve; 5 is an air inlet pipe; and 6 is an air outlet pipe. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application will be further described in detail below in combination with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top" and "bottom" indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] The oil gas recovery regulating method of the preferred embodiment of the present application comprises the following steps,

[0024] Step 1, the start-stop signal of the batch loading controller is given by the loading monitoring and management system, and the loading numbers of the top-loading tank car and the bottom-loading tank car are monitored, the loading monitoring and management system;

[0025] Step 2, adjusting the air volume of the fan 1 according to the loading flow (through the loading type and the loading number),

[0026] Loading flow: air volume = 1: (1-1.2),

[0027] Loading flow = top-loading loading number * top-loading average flow + bottom-loading loading number * bottom-loading average flow; in the embodiment, the top-loading average flow is 80m 3 / h; the bottom-loading average flow is 120m 3 / h, i.e. loading flow = top-loading loading number * 80m 3 / h + bottom-loading loading number * 120m 3 / h;

[0028] Step 3, when the loading flow is 0, stop the operation of the compressor of the oil gas treatment device 2 and open the backflow regulating valve 4, the fan 1 runs for 15 minutes and then enters the standby state; for example, Figure 1As shown, the oil gas recovery system comprises an air inlet pipe 5, a fan 1, an oil gas treatment device 2, a backflow pipe 3, a backflow regulating valve 4 and an air outlet pipe 6, the fan 1 sucks and transports air containing oil gas to the oil gas treatment device 2 through the air inlet pipe 5, and the backflow pipe 3 is connected between the air inlet pipe 5 and the air outlet pipe 6 of the oil gas treatment device 2, and the backflow regulating valve 4 is arranged on the backflow pipe 3.

[0029] The present application can adjust the air volume of the fan 1 according to the actual type (top-loading tank car and bottom-loading tank car) and the number of loading tank cars, so as to ensure that the air volume is reasonable, meets the actual working condition requirements, ensures that all oil gas can be recovered to the oil gas treatment device 2 for treatment, avoids excessive air volume and causes oil product loss during loading, optimizes the oil gas treatment process, avoids environmental pollution caused by oil gas volatilization into the atmosphere, reduces on-site oil gas volatilization, is beneficial to the occupational health of the operating personnel, and effectively solves the problem of the influence of the frosting of the heat exchanger on the system by using the non-loading period, stopping the operation of the compressor, and using the backflow pipe 3 and the fan 1 to circulate air blowing, and using the air heat exchange mode to defrost the heat exchanger of the oil gas treatment device 2.

[0030] Specifically, in the step 3, when the last tank car of the day is loaded (at this time, there is no need to wait for the loading flow to be 0), the compressor of the oil gas treatment device 2 is stopped, the backflow regulating valve 4 is opened, the fan 1 is operated until the pressure difference before and after the heat exchanger of the oil gas treatment device 2 is reduced to a set value (the pressure difference set value is usually obtained by actual test when the oil gas treatment device 2 is first put into use), and then the fan 1 is brought into a standby state, the residual heat of the heat exchanger of the oil gas treatment device 2 is used to condense and treat the oil gas generated by the last tank car of the day, so as to effectively save electric energy, and the heat exchanger of the oil gas treatment device 2 is defrosted by using the air heat exchange mode, so as to ensure that the oil gas treatment device 2 can normally operate.

[0031] Preferably, in the step 3, the air volume of the fan 1 is 30% of the rated air volume of the fan 1, which can effectively defrost the heat exchanger of the oil gas treatment device 2 and save electric energy.

[0032] In the description of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. An oil and gas recovery conditioning method, characterized by, The method comprises the following steps: Step 1, monitoring the loading number of the top-loading tank car and the bottom-loading tank car through the loading monitoring management system, Step 2, adjusting the air volume of the fan according to the loading flow, Loading flow: air volume = 1: (1~1.2), Loading flow = top-loading loading number * top-loading average flow + bottom-loading loading number * bottom-loading average flow; Step 3, when the loading flow is 0, stopping the compressor of the oil and gas treatment equipment and opening the backflow regulating valve, and the fan runs for 15 minutes and then enters the standby state; When the loading is completed to the last tank car of the day, the compressor of the oil and gas treatment equipment is stopped, the backflow regulating valve is opened, the fan runs until the pressure difference before and after the heat exchanger of the oil and gas treatment equipment decreases to the pressure difference setting value, and then the fan enters the standby state, the residual cold of the heat exchanger of the oil and gas treatment equipment is used to condense the oil gas generated by the last tank car of the day, and the heat exchanger of the oil and gas treatment equipment is defrosted by air heat exchange; wherein the fan sucks and delivers the air containing oil gas into the oil and gas treatment equipment through the air inlet pipe, and a backflow pipe is connected between the air inlet pipe and the air outlet pipe of the oil and gas treatment equipment, and a backflow regulating valve is arranged on the backflow pipe; the pressure difference setting value is obtained by actual test when the oil and gas treatment equipment is first put into use; the air volume of the fan is 30% of the rated air volume of the fan.

2. The oil and gas recovery conditioning method of claim 1, wherein, The top-loading average flow is 80 m³ / h; and the bottom-loading average flow is 120 m³ / h.

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