Device for preventing breather valve and hydraulic safety valve of oil storage tank from freezing and blocking in winter

Abstract

The invention relates to the technical field of oil field oil gas gathering and transportation, in particular to an oil storage tank breather valve and hydraulic safety valve winter anti-freezing and anti-blocking device which comprises an oil storage tank body, a connecting pipe, a flame arrester, a hydraulic safety valve, a breather valve, a mounting pipe and a first blocking net. The oil storage tank is reasonable and compact in structure and convenient to use, liquid in mixed steam can be filtered and then left in the oil storage tank body through the arrangement of the first blocking net, dry gas is exhausted, the contact amount of moisture, a valve disc and liquid seal oil is reduced, the phenomena of water accumulation in a liquid seal groove, freezing in winter and freezing and frosting of a pressure valve disc in winter can be effectively reduced, and the service life of the oil storage tank is prolonged. Meanwhile, the fire barrier net can be prevented from being in contact with mixed wet steam, corrosion of the fire barrier net is effectively prevented, the service life is prolonged, liquid filtered by the first blocking net contains oil components, oil loss is reduced, and the device has the advantages of being safe, capable of saving labor, simple, convenient and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas gathering and transportation in oil fields, and is a winter anti-freezing and blocking device for a breathing valve and a hydraulic safety valve of an oil storage tank. Background Art

[0002] Oil storage tanks are one of the important equipment for crude oil storage and transportation. Oil storage tanks are generally equipped with flame arresters, breathing valves and hydraulic safety valves. The breathing valve is an important accessory to protect the safety of oil storage tanks. It consists of two parts: a pressure valve and a vacuum valve. Its function is to maintain the airtightness of the oil storage tank under normal circumstances and reduce the evaporation loss of oil products to a certain extent. When necessary, it can automatically ventilate and adjust the balance of the pressure inside and outside the oil storage tank, which plays a safety role in the oil storage tank. The breathing valve is a safe and energy-saving product that maintains the air pressure balance of the oil storage tank and reduces the volatilization of the medium. The breathing valve makes full use of the pressure bearing capacity of the oil storage tank itself to reduce the discharge of the medium. Its principle is to use the weight of the positive and negative pressure valve disc to control the positive exhaust pressure and negative suction pressure of the oil storage tank. When the pressure of the medium in the oil storage tank is within the control operating pressure range of the breathing valve, the breathing valve does not work to maintain the airtightness of the oil storage tank; when the medium is added to the oil storage tank, the pressure of the upper gas space in the oil storage tank increases, and when it reaches the operating positive pressure of the breathing valve, the pressure valve is pushed open, and the gas escapes from the exhalation port of the breathing valve, so that the pressure in the oil storage tank no longer continues to increase; when the medium is pumped out of the oil storage tank, the pressure of the upper gas space in the oil storage tank decreases, and when it reaches the operating negative pressure of the breathing valve, the atmosphere outside the oil storage tank will push open the negative pressure valve disc of the breathing valve, allowing external gas to enter the oil storage tank, so that the pressure in the oil storage tank no longer continues to decrease, and the air pressure inside and outside the oil storage tank is balanced to protect the safety device of the oil storage tank.

[0003] Hydraulic safety valve, the flame arrester is installed at the bottom of the hydraulic safety valve, its function is to divide and cool the external fire source to prevent the fire source from entering the oil storage tank, the liquid seal tank is filled with a certain level of liquid seal oil. Its function is to isolate the contact between the inside and outside of the oil storage tank, balance the pressure difference between the inside and outside of the oil storage tank through the change of the liquid level, and when the pressure difference is greater than the liquid seal pressure, gas exchange is carried out. The partition and the umbrella cap are integrated to play the role of dividing the liquid seal oil, and the bottom is serrated to facilitate gas inhalation or exhalation.

[0004] During the operation of the oil storage tank, there are "big and small breathing" losses. This part of the oil loss accumulates day by day, and the total amount cannot be ignored. The method of installing a breathing valve and a hydraulic safety valve on the tank top is generally used on site to reduce the oil loss caused by "big and small breathing". However, the winter in the northern region is very cold, and the flame arrester, hydraulic safety valve and breathing valve will have the following conditions after running for a period of time: when the mixed steam in the tank passes through the flame arrester, the liquid in the mixed steam will adhere to the flame arrester net, causing the flame arrester net to rust and affect the performance of the flame arrester; the liquid in the mixed steam will be deposited in the liquid seal groove of the hydraulic safety valve, which will push out the liquid seal oil in the liquid seal groove, and the liquid seal oil will escape, affecting the normal operation of the hydraulic safety valve; the liquid in the mixed steam adheres to the breathing valve, which will cause the valve disc to freeze and not move, and freeze, affecting the normal operation of the oil storage tank. Summary of the invention

[0005] The present invention provides an anti-freezing and blocking device for a breathing valve and a hydraulic safety valve of an oil storage tank in winter, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of leakage of liquid seal oil and freezing of valve discs in hydraulic safety valves and breathing valves on existing oil storage tanks, which affect the normal operation of the oil storage tank.

[0006] The technical solution of the present invention is achieved through the following measures: a winter anti-freezing blocking device for a breathing valve and a hydraulic safety valve of an oil storage tank, comprising an oil storage tank body, a connecting pipe, a flame arrester, a hydraulic safety valve, a breathing valve, a mounting pipe and a first blocking net, wherein the upper end of the oil storage tank body is provided with a breathing hole connected inside and outside, a connecting pipe is fixedly installed on the upper side of the oil storage tank body corresponding to the position of the breathing hole, a flame arrester is fixedly installed on the upper end of the connecting pipe, a hydraulic safety valve or a breathing valve is fixedly installed on the upper end of the flame arrester, an mounting pipe, a diffusion pipe and an exhaust pipe which are fixedly connected together from top to bottom are mounted on the inner side of the connecting pipe, the lower end of the exhaust pipe is located on the inner side of the upper part of the oil storage tank body, the diffusion pipe is in a cone shape with a larger upper part and a smaller lower part, the upper end of the mounting pipe and the inner side of the lower end of the flame arrester are fixedly installed together, and a first blocking net with a mesh structure is fixedly installed on the inner side of the upper part of the mounting pipe.

[0007] The following are further optimizations and / or improvements to the above technical solutions: A second barrier net with a mesh structure can be fixedly installed on the inner side of the lower part of the installation pipe corresponding to the lower side position of the first barrier net, and the mesh number of the second barrier net is greater than the mesh number of the first barrier net.

[0008] The thickness of the first barrier net may be smaller than the thickness of the second barrier net.

[0009] A first connecting flange can be fixedly installed on the upper end of the above-mentioned connecting pipe, and a plurality of first connecting holes that penetrate vertically are evenly distributed along the circumference on the upper end of the first connecting flange. A second connecting flange is fixedly installed on the outer side of the upper end of the mounting pipe corresponding to the upper end position of the first connecting flange, and a second connecting hole that penetrates vertically is provided on the upper end of the second connecting flange corresponding to each first connecting hole position, and a connecting bolt corresponding to the second connecting holes is fixedly installed on the lower end of the flame arrester, and a connecting nut is screwed on the lower end of the connecting bolt after passing through the second connecting hole and the corresponding first connecting hole in sequence.

[0010] An annular reinforcement plate may be fixedly mounted on the outer side of the lower portion of the connecting pipe, and the lower side of the reinforcement plate is fixedly mounted together with the upper side of the oil storage tank body.

[0011] The above-mentioned breathing valve can be a mechanical breathing valve.

[0012] The present invention has a reasonable and compact structure and is easy to use. The arrangement of the first barrier net can filter the liquid in the mixed steam and retain it in the oil storage tank body, and the dry gas is discharged, thereby reducing the contact amount of moisture with the valve disc and the liquid sealing oil, and can effectively reduce water accumulation in the liquid sealing groove, ice formation in winter, and ice and frost formation on the pressure valve disc in winter. At the same time, it can also avoid the flame arrester fire arrester net from contacting the mixed wet steam, effectively preventing the flame arrester fire arrester net from rusting and extending its service life. At the same time, the liquid filtered by the first barrier net contains oil components, which also reduces oil loss. It has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 This is a schematic diagram of the front cross-sectional structure of the flame arrester and the hydraulic safety valve installed together in Example 1.

[0014] Attached Figure 2 This is a schematic diagram of the front cross-sectional structure of the flame arrester and the breathing valve installed together in Example 1.

[0015] The codes in the accompanying drawings are: 1 is the oil storage tank body, 2 is the connecting pipe, 3 is the flame arrester, 4 is the hydraulic safety valve, 5 is the breathing valve, 6 is the installation pipe, 7 is the first barrier net, 8 is the diffusion pipe, 9 is the exhaust pipe, 10 is the second barrier net, 11 is the first connecting flange, 12 is the second connecting flange, 13 is the connecting bolt, 14 is the connecting nut, and 15 is the reinforcement plate. DETAILED DESCRIPTION

[0016] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0017] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0018] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figure 1 , 2 As shown, the winter anti-freezing blocking device of the breathing valve and hydraulic safety valve of the oil storage tank comprises an oil storage tank body 1, a connecting pipe 2, a flame arrester 3, a hydraulic safety valve 4, a breathing valve 5, a mounting pipe 6 and a first blocking net 7. The upper end of the oil storage tank body 1 is provided with a breathing hole connected inside and outside, and a connecting pipe 2 is fixedly installed on the upper side of the oil storage tank body 1 corresponding to the position of the breathing hole, and a flame arrester 3 is fixedly installed on the upper end of the connecting pipe 2. The hydraulic safety valve 4 or the breathing valve 5 is fixedly installed on the upper end of the flame arrester 3. The inner side of the connecting pipe 2 is provided with a mounting pipe 6, a diffusion pipe 8 and an exhaust pipe 9 which are fixedly connected together from top to bottom in sequence. The lower end of the exhaust pipe 9 is located on the inner side of the upper part of the oil storage tank body 1, and the diffusion pipe 8 is in a cone shape with a larger upper part and a smaller lower part. The upper end of the mounting pipe 6 and the inner side of the lower end of the flame arrester 3 are fixedly installed together, and a first blocking net 7 with a mesh structure is fixedly installed on the inner side of the upper part of the mounting pipe 6.

[0019] During use, with such an arrangement, the mixed steam in the oil storage tank body 1 slows down when it enters the diffusion pipe 8 through the exhaust pipe 9, and then when it passes through the first barrier net 7, the gas contacts the surface of the first barrier net 7, the temperature decreases, and the first barrier net 7 absorbs the liquid in the gas and gathers it into droplets, which fall back into the oil storage tank body 1 under the action of gravity, and the dry gas is discharged to the outside of the oil storage tank body 1 after passing through the flame arrester 3. The first barrier net 7 can filter the mixed steam, which can prevent water from accumulating and freezing in the liquid seal groove of the hydraulic safety valve 4, thereby keeping the oil in the hydraulic safety valve 4 in a liquid state at all times, and can also prevent the breathing valve 5 from freezing in winter, so that the breathing valve 5 always remains in a smooth state, ensuring the normal operation of the oil storage tank body 1 After the first barrier net 7 absorbs the liquid in the gas and gathers it into droplets, since the first barrier net 7 is close to the oil storage tank body 1, the heat in the oil storage tank body 1 can be used for insulation to prevent the first barrier net 7 from being frozen. The setting of the first barrier net 7 can filter the liquid in the mixed steam and leave it in the oil storage tank body 1, and the dry gas is discharged, which reduces the contact amount of moisture with the valve disc and liquid seal oil, and can effectively reduce the accumulation of water in the liquid seal tank, ice in winter, and ice and frost on the breathing valve in winter. At the same time, it can also prevent the flame arrester 3 from contacting the mixed wet steam, effectively preventing the flame arrester 3 from rusting and extending the service life. At the same time, the liquid filtered by the first barrier net 7 contains oil components, which also reduces the loss of oil products. The present invention has a reasonable and compact structure, is easy to use, and has the characteristics of safety, labor saving, simplicity and high efficiency.

[0020] According to actual needs, the above-mentioned oil storage tank breathing valve and hydraulic safety valve winter anti-freezing blocking device can be further optimized and / or improved: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown, a second blocking net 10 with a mesh structure is fixedly installed on the inner side of the lower part of the mounting tube 6 corresponding to the lower side position of the first blocking net 7. The mesh number of the second blocking net 10 is greater than the mesh number of the first blocking net 7, and the thickness of the first blocking net 7 is less than the thickness of the second blocking net 10. According to the requirements, the thickness of the first blocking net 7 is one-third of the length of the mounting tube 6, and the thickness of the second blocking net 10 is two-thirds of the length of the mounting tube 6. During use, through such a setting, the contact area between the mixed steam and the blocking net after rising can be increased, and the liquid in the mixed steam can be filtered, which can prevent water from accumulating and freezing in the liquid seal groove of the hydraulic safety valve 4, so that the oil of the hydraulic safety valve 4 is always in a liquid state, and can also prevent the breathing valve 5 from freezing in winter, so that the breathing valve 5 always remains in a smooth state, ensuring the normal operation of the oil storage tank body 1.

[0021] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown, a first connecting flange 11 is fixedly installed on the upper end of the connecting pipe 2, and a plurality of first connecting holes are evenly spaced along the circumference of the upper end of the first connecting flange 11, and a second connecting flange 12 is fixedly installed on the outer side of the upper end of the mounting pipe 6 corresponding to the upper end position of the first connecting flange 11, and a second connecting hole is provided on the upper end of the second connecting flange 12 corresponding to each first connecting hole position, and a connecting bolt 13 corresponding to the second connecting hole is fixedly installed on the lower end of the flame arrester 3, and the lower end of the connecting bolt 13 passes through the second connecting hole and the corresponding first connecting hole in turn and is screwed with a connecting nut 14. In the process of use, through such a setting, it is convenient to disassemble and assemble the connecting pipe 2 and the flame arrester 3, and reduce the maintenance cost in the later stage.

[0022] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown, an annular reinforcing plate 15 is fixedly installed on the outer side of the lower part of the connecting pipe 2, and the lower side of the reinforcing plate 15 is fixedly installed together with the upper side of the oil storage tank body 1. During use, such an arrangement can improve the connection strength between the connecting pipe 2 and the oil storage tank body 1, and can ensure the stability of the connection between the flame arrester 3, the hydraulic safety valve 4 and the breathing valve 5.

[0023] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2As shown, the breathing valve 5 is a mechanical breathing valve. The mechanical breathing valve meets the ventilation requirements of the oil storage tank body 1, maintains the airtightness of the oil storage tank body 1, and reduces the evaporation loss of the oil product to a certain extent. When necessary, it can automatically ventilate and adjust the balance of the internal and external pressures of the oil storage tank body 1, which plays a safety role for the oil storage tank body 1.

[0024] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A winter anti-freezing device for oil tank breathing valve and hydraulic safety valve, characterized in that The utility model comprises an oil storage tank body, a connecting pipe, a flame arrester, a hydraulic safety valve, a breathing valve, a mounting pipe and a first blocking net. A breathing hole which is connected inside and outside is provided at the upper end of the oil storage tank body. A connecting pipe is fixedly installed on the upper side of the oil storage tank body corresponding to the position of the breathing hole. A flame arrester is fixedly installed on the upper end of the connecting pipe. A hydraulic safety valve or a breathing valve is fixedly installed on the upper end of the flame arrester. A mounting pipe, a diffusion pipe and an exhaust pipe which are fixedly connected together from top to bottom are mounted on the inner side of the connecting pipe. The lower end of the exhaust pipe is located on the inner side of the upper part of the oil storage tank body. The diffusion pipe is in a cone shape which is larger at the upper part and smaller at the lower part. The upper end of the mounting pipe and the inner side of the lower end of the flame arrester are fixedly installed together. A first blocking net with a mesh structure is fixedly installed on the inner side of the upper part of the mounting pipe.

2. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 1 is characterized in that A second barrier net with a mesh structure is fixedly installed on the inner side of the lower part of the installation tube corresponding to the lower side position of the first barrier net, and the mesh number of the second barrier net is greater than the mesh number of the first barrier net.

3. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 2 is characterized in that The thickness of the first barrier net is smaller than the thickness of the second barrier net.

4. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 1, 2 or 3, characterized in that A first connecting flange is fixedly installed on the upper end of the connecting pipe, and a plurality of first connecting holes that penetrate vertically are evenly distributed along the circumference on the upper end of the first connecting flange. A second connecting flange is fixedly installed on the outer side of the upper end of the mounting pipe corresponding to the upper end position of the first connecting flange, and a second connecting hole that penetrates vertically is provided on the upper end of the second connecting flange corresponding to each first connecting hole position, and a connecting bolt corresponding to the second connecting holes is fixedly installed on the lower end of the flame arrester, and a connecting nut is screwed on the lower end of the connecting bolt after passing through the second connecting hole and the corresponding first connecting hole in sequence.

5. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 1, 2 or 3, characterized in that An annular reinforcement plate is fixedly installed on the outer side of the lower part of the connecting pipe, and the lower side of the reinforcement plate is fixedly installed with the upper side of the oil storage tank body.

6. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 4 is characterized in that An annular reinforcement plate is fixedly installed on the outer side of the lower part of the connecting pipe, and the lower side of the reinforcement plate is fixedly installed with the upper side of the oil storage tank body.

7. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 1, 2, 3 or 6, characterized in that The breathing valve is a mechanical breathing valve.

8. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 4 is characterized in that The breathing valve is a mechanical breathing valve.

9. The winter anti-freezing and blocking device for the oil tank breathing valve and hydraulic safety valve according to claim 5 is characterized in that The breathing valve is a mechanical breathing valve.

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