Heat exchange pry and oil gas adsorption treatment system

Abstract

The utility model discloses a heat exchange pry and an oil gas adsorption treatment system, relates to an oil gas recycling technology, solves the problem of low oil gas recycling efficiency, and adopts the technical scheme that the heat exchange pry comprises a pre-cooling heat exchanger and a cooler; the precooling heat exchanger is a liquid cooler and comprises a precooling liquid inlet, a precooling liquid outlet, a cooling load inlet and a cooling load outlet; the cooler comprises a liquid inlet and a liquid outlet; the cooling load outlet is communicated with the liquid inlet; the heat exchange pry is used for an oil gas cooling system. The oil-gas cooling device comprises an absorption tower and an oil storage tank; an absorbent storage tank is arranged at the bottom of the absorption tower; a storage tank liquid outlet is formed in the absorbent storage tank; a liquid outlet of the storage tank is communicated with the pre-cooling liquid inlet; the precooling liquid outlet is communicated with the oil storage tank; the cooling load inlet communicates with the oil storage tank. The purpose of improving the oil gas recovery efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to an oil and gas recovery and utilization technology, and more specifically, to a heat exchange skid and an oil and gas adsorption and absorption treatment system. Background Technique

[0002] An oil and gas recovery device is equipment used to recover the oil and gas volatilized during production, storage, transportation, or loading and unloading in places such as gas stations, oil depots, and oil tank trucks. These devices help reduce the pollution of oil and gas to the air and the environment, and at the same time reduce potential safety hazards. There are various types of oil and gas recovery devices, including vapor recovery, liquid-gas separation, absorption recovery, condensation recovery, adsorption recovery, etc., which are suitable for different scenarios. The oil and gas recovery method used in gas stations often adopts the method of gas-liquid separation; the gas after gas-liquid separation still contains a large amount of oil and gas components, so it needs to be further recovered. The existing technology uses the method of an absorption tower. Gasoline in the storage tank is sprayed down from the top of the absorption tower as an absorbent. After the gas after gas-liquid separation enters the absorption tower, the sprayed gasoline will absorb the gasoline components in the gas and finally return to the storage tank. There are two problems with the existing technology. One is that the gas discharged from the absorption tower still contains some oil and gas components; the other is that when the temperature is relatively high, the temperature of the gasoline in the storage tank can even reach above 30 degrees, and the absorption efficiency is not high. Content of the Utility Model

[0003] In the first aspect, the purpose of the utility model is to provide a heat exchange skid that adopts a two-stage cooling method to achieve the purpose of cooling the absorbent.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions: A heat exchange skid, the heat exchange skid includes a precooling heat exchanger and a cooler; the precooling heat exchanger is a liquid cooler, including a precooling liquid inlet, a precooling liquid outlet, a cooling load inlet, and a cooling load outlet; the cooler includes a liquid inlet and a liquid outlet; the cooling load outlet is communicated with the liquid inlet; the heat exchange skid is used for an oil and gas cooling system; the oil and gas cooling system includes an absorption tower and a storage tank, and an absorbent storage tank is arranged at the bottom of the absorption tower; a storage tank liquid outlet is arranged on the absorbent storage tank; the storage tank liquid outlet is communicated with the precooling liquid inlet; the precooling liquid outlet is communicated with the storage tank; the cooling load inlet is communicated with the storage tank.

[0005] The heat exchange skid can reduce the temperature of gasoline as an absorbent. When the gasoline passes through the precooling heat exchanger, the temperature of the gasoline can be initially reduced; then when the gasoline enters the cooler, the temperature can be further reduced to form a low-temperature absorbent; after the low-temperature absorbent enters the absorption tower to absorb oil and gas, the temperature rise is not obvious at this time. Transporting the low-temperature absorbent to the precooling heat exchanger for heat exchange with the gasoline coming out of the storage tank can effectively save energy.

[0006] Further, it also includes an absorbent supply pump and an absorbent return pump; the absorbent supply pump is arranged between the oil storage tank and the precooling heat exchanger, and is used to output the absorbent from the oil storage tank to the precooling heat exchanger; the absorbent return pump is arranged between the absorbent storage tank and the precooling heat exchanger, and is used to transport the absorbent from the absorbent storage tank to the precooling heat exchanger.

[0007] Further, the cooler is used to reduce the temperature of the absorbent to 5-10 degrees Celsius.

[0008] Further, the cooler is one of an air cooler and a water cooler.

[0009] In a second aspect, the present utility model provides an oil and gas absorption and adsorption system, which includes an absorption tower, an adsorption tower and an oil storage tank; an absorbent spray port is arranged at the upper part of the absorption tower; an oil and gas outlet is arranged at the top of the absorption tower; an oil and gas inlet is arranged in the middle of the absorption tower; the oil and gas inlet is communicated with an intake pipeline; an absorbent storage tank is arranged at the bottom of the absorption tower; a liquid outlet of the storage tank is arranged on the storage tank; the adsorption tower includes an adsorption tower inlet; an adsorption tower outlet is arranged at the top of the adsorption tower; the adsorption tower is filled with activated carbon for oil and gas recovery; the oil and gas outlet is communicated with the adsorption tower inlet; it also includes a heat exchange skid; the heat exchange skid includes a precooling heat exchanger and a cooler; the precooling heat exchanger is a liquid cooler, and includes a precooling liquid inlet, a precooling liquid outlet, a cooling load inlet and a cooling load outlet; the cooler includes a liquid inlet and a liquid outlet; the cooling load outlet is communicated with the liquid inlet; the liquid outlet of the storage tank is communicated with the precooling liquid inlet; the precooling liquid outlet is communicated with the oil storage tank; the cooling load inlet is communicated with the oil storage tank.

[0010] The absorption efficiency can be improved through the heat exchange skid. The oil and gas can be better absorbed through the adsorption tower, making the discharged gas meet the standards.

[0011] Further, the adsorption tower includes an intake valve, an exhaust valve and a return air valve; the exhaust valve is arranged at the adsorption tower outlet; the intake valve is arranged between the adsorption tower inlet and the oil and gas outlet; it also includes a return air pump, and the return air pump is arranged between the adsorption tower inlet and the oil and gas inlet; the return air valve is arranged between the return air pump and the adsorption tower inlet.

[0012] The adsorbed oil and gas can be recovered through the return air pump, saving resources.

[0013] Further, the adsorption tower includes a first adsorption tower and a second adsorption tower; the first adsorption tower and the second adsorption tower are arranged in parallel.

[0014] The parallel arrangement increases the continuity of system use.

[0015] Further, an explosion-proof variable frequency fan is arranged on the intake pipeline.

[0016] In summary, the utility model has the following beneficial effects: through precooling and cooling, the temperature of the absorbent can be effectively reduced; at the same time, using the absorbent with a lower temperature in the absorbent storage tank as the precooling medium can effectively save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the oil and gas absorption and adsorption system in the embodiment

[0018] In the figure: 1, heat exchange skid; 2, precooling heat exchanger; 3, cooler; 4, absorption tower; 5, adsorption tower; 6, intake valve; 7, return air valve; 8, exhaust valve; 9, return air pump; 10, absorbent return pump; 11, absorbent supply pump; 12, explosion-proof variable-frequency fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to the other component, and this "connection" does not limit fixed connection or movable connection. The specific connection method should be determined according to the specific technical problem to be solved.

[0021] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0023] Embodiment:

[0024] An oil and gas absorption and adsorption system, which includes a heat exchange skid 1, an absorption tower 4, an adsorption tower 5 and an oil storage tank; an absorbent spray port is arranged at the upper part of the absorption tower 4; an oil and gas outlet is arranged at the top of the absorption tower 4; an oil and gas inlet is arranged in the middle of the absorption tower 4; the oil and gas inlet is communicated with an intake pipeline; the intake pipeline is communicated with a gas-liquid separator of a gas station. An absorbent storage tank is arranged at the bottom of the absorption tower 4; a liquid outlet of the storage tank is arranged on the storage tank; the adsorption tower 5 includes an inlet of the adsorption tower 5; an outlet of the adsorption tower 5 is arranged at the top of the adsorption tower 5; the adsorption tower 5 is filled with activated carbon for oil and gas recovery; the oil and gas outlet is communicated with the inlet of the adsorption tower 5. The heat exchange skid 1 includes a precooling heat exchanger 2 and a cooler 3; the precooling heat exchanger 2 is a liquid cooler, which includes a precooling liquid inlet, a precooling liquid outlet, a cooling load inlet and a cooling load outlet; the cooler 3 includes a liquid inlet and a liquid outlet; the cooling load outlet is communicated with the liquid inlet; the liquid outlet of the storage tank is communicated with the precooling liquid inlet; the precooling liquid outlet is communicated with the oil storage tank; the cooling load inlet is communicated with the oil storage tank.

[0025] In summer, the oil temperature in the oil storage tank is relatively high, and it can reach more than 30 degrees at the highest. If the gasoline in the oil storage tank is pumped to the absorption tower 4 at this time, the absorption efficiency of the absorption tower 4 for the gasoline component in the oil and gas is not high. The heat exchange skid 1 can reduce the temperature of the gasoline as the absorbent. When the gasoline passes through the precooling heat exchanger 2, the temperature of the gasoline can be initially reduced; then when the gasoline enters the cooler 3, the temperature can be further reduced to form a low-temperature absorbent; after the low-temperature absorbent enters the absorption tower 4 to absorb the oil and gas, the temperature rise is not obvious at this time. The low-temperature absorbent is transported to the precooling heat exchanger 2 to exchange heat with the gasoline coming out of the oil storage tank, which can effectively save energy.

[0026] It also includes an absorbent supply pump 11 and an absorbent return pump 10; the absorbent supply pump 11 is arranged between the oil storage tank and the precooling heat exchanger 2, and is used to output the absorbent from the oil storage tank to the precooling heat exchanger 2; the absorbent return pump 10 is arranged between the absorbent storage tank and the precooling heat exchanger 2; and is used to transport the absorbent from the absorbent storage tank to the precooling heat exchanger 2.

[0027] The absorbent supply pump 11 and the absorbent return pump 10 can achieve a higher efficiency of the absorbent circulation.

[0028] Preferably, the cooler 3 is used to reduce the temperature of the absorbent to 5-10 degrees Celsius. The cooler 3 is one of an air cooler 3 and a water cooler 3.

[0029] Reducing the temperature of the absorbent to 5-10 degrees Celsius, the economic benefit is the most obvious at this time; that is, further cooling requires more costs, and the absorption efficiency does not increase significantly when the temperature is further reduced.

[0030] Optionally, the cooler 3 includes a refrigeration unit. After the refrigeration unit cools the coolant, heat exchange is performed with the absorbent through a heat exchanger to achieve the purpose of cooling the absorbent.

[0031] Preferably, the adsorption tower 5 includes an intake valve 6, an exhaust valve 8, and a return air valve 7; the exhaust valve 8 is arranged at the outlet of the adsorption tower 5; the intake valve 6 is arranged between the inlet of the adsorption tower 5 and the oil and gas outlet; a return air pump 9 is further included, and the return air pump 9 is arranged between the inlet of the adsorption tower 5 and the oil and gas inlet; the return air valve 7 is arranged between the return air pump 9 and the inlet of the adsorption tower 5.

[0032] Through the above solution, the oil and gas adsorbed in the adsorption tower 5 can be extracted to the absorption tower 4 for further recovery. When extracting the oil and gas adsorbed in the adsorption tower 5, the exhaust valve 8 and the intake valve 6 are closed, the return air valve 7 is opened, and the vacuum pump is connected to the adsorption tower 5. During the adsorption operation, the exhaust valve 8 and the intake valve 6 are opened and the return air valve 7 is closed.

[0033] Preferably, the adsorption tower 5 includes a first adsorption tower 5 and a second adsorption tower 5; the first adsorption tower 5 and the second adsorption tower 5 are arranged in parallel.

[0034] By arranging them in parallel, they can be used alternately. When one tower returns air through the return air pump 9, the other tower can perform the adsorption operation. The continuity of the system is increased. The return air pump 9 is a vacuum pump.

[0035] Preferably, an explosion-proof variable-frequency fan 12 is arranged on the intake pipeline. The probability of accidents can be reduced through the explosion-proof variable-frequency fan 12.

[0036] Working principle and effect: In an oil depot, when an oil tanker is loading oil products, the oil and gas in the original empty oil tank and the air are mixed with the oil and gas volatilized from the loaded liquid product. As the liquid fills the empty oil tanker, the liquid squeezes the air and oil and gas out from the top of the oil tank. Under the action of a slightly positive pressure, it enters the gas collection pipeline system through the oil and gas recovery pipeline and then flows into the gas-liquid separation tank. The gas-liquid separation tank separates the liquid oil products in the oil and gas. After the separated liquid oil reaches a certain liquid level, the liquid oil is pumped back into the oil tank with a pump. Then, the oil and gas completely without liquid is sucked into the oil and gas absorption and adsorption system by the explosion-proof variable-frequency fan.

[0037] After entering the oil and gas absorption and adsorption system, the oil and gas first enter a low-temperature and highly efficient absorption tower for recovery treatment. Subsequently, the unabsorbed oil and gas enter one of the two adsorption towers. Each adsorption tower is filled with imported special activated carbon for oil and gas recovery. The volatile oil and gas are adsorbed onto the surface of the activated carbon particles and remain there under atmospheric conditions. The air component in the mixed gas is not affected by the activated carbon and enters the atmosphere after passing through the activated carbon without being doped with hydrocarbons anymore. During the adsorption process, the special activated carbon uses the power of surface kinetic energy to attract hydrocarbon molecules. The special activated carbon used in the oil and gas recovery device has a very large surface absorption area, with an average of about 1,800,000 m 2 / kg. Such a large surface area enables each kilogram of activated carbon to adsorb up to 0.1 kilogram of hydrocarbons. When the oil and gas flow through the activated carbon, most of the light hydrocarbon components in the oil and gas are adsorbed by the activated carbon. The remaining trace amounts of unadsorbed light hydrocarbons and air are discharged up to standard from the top of the adsorption tower. As the amount of oil and gas adsorbed by the activated carbon increases, after the activated carbon gradually reaches the rated adsorption capacity, it must be regenerated to continue to play the adsorption role.

[0038] After the adsorption reaches the set time, the system automatically switches to the other adsorption tower to continue adsorbing the oil and gas. The return air pump is started to evacuate the adsorption tower that has completed the adsorption, breaking the adsorption force between the activated carbon and the light hydrocarbon components, releasing the light hydrocarbon components from the activated carbon, and transporting them to the middle of the absorption tower through the return air pump. The light hydrocarbon components will continuously move upward. At the same time, gasoline in the gasoline storage tank in the storage area is sent to the top of the absorption tower for spraying after being cooled by heat exchange through the absorbent supply pump. The two media are evenly distributed through the packing layer with a very large specific surface area and come into full contact. The light hydrocarbon components are continuously dissolved and absorbed by the gasoline. The gasoline after absorbing the oil and gas is transported back to the gasoline storage tank by the rich oil pump to achieve the purpose of oil and gas recovery. The remaining small amount of unabsorbed oil and gas passes from the top of the absorption tower to the adsorption tower through the process pipeline for secondary adsorption.

[0039] After the desorption and regeneration of the adsorption tower are completed, a vacuum-breaking operation is carried out to introduce a small amount of air into the adsorption tower to gradually restore the adsorption tower to normal pressure and complete the regeneration process. At this time, the adsorption tower that is currently adsorbing the oil and gas has completed the adsorption process. The two adsorption towers are switched, and the adsorption tower that has completed the vacuum desorption and regeneration is put into the operation of adsorbing the oil and gas, and the adsorption tower that has completed the adsorption is subjected to vacuum desorption and regeneration, so as to realize the continuous operation of activated carbon adsorption, desorption and regeneration.

[0040] Taking the test at a summer oil temperature of 32 degrees, the oil temperature is reduced to below 10 degrees Celsius through the heat exchange skid, and the gasoline removal rate can be increased by 40 percentage points; after passing through the pre-cooling heat exchanger, the temperature of the reflux absorbent can be raised to about 18 degrees Celsius; its cooling effect on the absorbent entering the pre-cooling heat exchanger from the storage tank is obvious.

[0041] This specific embodiment is only an interpretation of the present utility model and does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

Claims

1. A heat exchange skid, characterized by: The heat exchange skid comprises a precooling heat exchanger and a cooler; the precooling heat exchanger is a liquid cooler, comprising a precooling liquid inlet, a precooling liquid outlet, a cooling load inlet and a cooling load outlet; the cooler comprises a liquid inlet and a liquid outlet; the cooling load outlet is connected to the liquid inlet; The heat exchange skid is used for an oil and gas cooling system; the oil and gas cooling system includes an absorption tower and an oil storage tank, an absorbent storage tank is provided at the bottom of the absorption tower; a storage tank liquid outlet is provided on the absorbent storage tank; the storage tank liquid outlet is connected to a precooling liquid inlet; the precooling liquid outlet is connected to the oil storage tank; and the cooling load inlet is connected to the oil storage tank.

2. A heat exchange skid according to claim 1, characterized in that: It also includes an absorbent supply pump and an absorbent return pump; the absorbent supply pump is arranged between the oil storage tank and the precooling heat exchanger, and is used to output the absorbent from the oil storage tank to the precooling heat exchanger; the absorbent return pump is arranged between the absorbent storage tank and the precooling heat exchanger; and is used to transport the absorbent from the absorbent storage tank to the precooling heat exchanger.

3. The heat exchange skid according to claim 1, characterized in that: The cooler is used to reduce the temperature of the absorbent to 5-10 degrees Celsius.

4. A heat exchange skid according to claim 3, characterized in that: The cooler is one of an air cooler and a water cooler.

5. An oil and gas absorption system, characterized by: The oil and gas absorption and adsorption system comprises an absorption tower, an adsorption tower and an oil storage tank; an absorbent spray port is arranged at the upper part of the absorption tower; an oil and gas outlet is arranged at the top of the absorption tower; an oil and gas inlet is arranged at the middle part of the absorption tower; the oil and gas inlet is communicated with the air intake pipeline; an absorbent storage tank is arranged at the bottom of the absorption tower; a storage tank liquid outlet is arranged on the storage tank; the adsorption tower comprises an adsorption tower inlet; an adsorption tower outlet is arranged at the top of the adsorption tower; the adsorption tower is filled with oil and gas recovery activated carbon; the oil and gas outlet is communicated with the adsorption tower inlet; It also includes a heat exchange skid; the heat exchange skid includes a precooling heat exchanger and a cooler; the precooling heat exchanger is a liquid cooler, including a precooling liquid inlet, a precooling liquid outlet, a cooling load inlet and a cooling load outlet; the cooler includes a liquid inlet and a liquid outlet; the cooling load outlet is connected to the liquid inlet; the storage tank liquid outlet is connected to the precooling liquid inlet; the precooling liquid outlet is connected to the oil storage tank; the cooling load inlet is connected to the oil storage tank.

6. The oil and gas adsorption system according to claim 5, characterized in that: The adsorption tower comprises an air inlet valve, an air outlet valve and an air return valve; the air outlet valve is arranged at the outlet of the adsorption tower; the air inlet valve is arranged between the inlet of the adsorption tower and the oil and gas outlet; It also includes a return air pump, which is arranged between the adsorption tower inlet and the oil and gas inlet; and a return air valve is arranged between the return air pump and the adsorption tower inlet.

7. The oil and gas adsorption system according to claim 6, characterized in that: The adsorption tower comprises a first adsorption tower and a second adsorption tower; the first adsorption tower and the second adsorption tower are arranged in parallel.

8. The oil and gas adsorption system according to claim 7, characterized in that: An explosion-proof variable frequency fan is arranged on the air intake pipeline.

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