Tail gas condensate collecting device

Abstract

The utility model discloses a tail gas condensate collecting device. The collecting device comprises an oil-water separation tank, a plurality of condensate inlets are formed in the top of the oil-water separation tank, a liquid insertion pipe is arranged in the oil-water separation tank, and the top end of the liquid insertion pipe is connected with the condensate inlets; the oil product overflow groove is fixed on the inner wall of the bottom of the oil-water separation tank; the water overflow tank is arranged behind the oil product overflow tank; the device further comprises a plurality of drain valves mounted on the bottom wall of the oil-water separation tank; the oil-water separation device further comprises a plurality of reserved connectors installed on the top wall of the oil-water separation tank, one reserved connector is provided with a pressure relief hard pipe connected to the conveying pipe, and the outlet end of the pressure relief hard pipe is located in front of the condenser. A liquid insertion pipe is additionally arranged at a condensate inlet of the oil-water separation tank to form liquid seal, and channeling of non-condensable gas such as nitrogen is reduced. Meanwhile, in order to prevent liquid in the tank from volatilizing to influence the CO reactor, a pressure relief hard pipe is arranged to lead volatile gas to the front of the condenser for unified secondary treatment, the load of the CO reactor is reduced, and the oil gas recovery rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of condensation recovery, in particular to a tail gas condensate collecting device. Background Art

[0002] As an important part of the current oil and gas recovery management, the condensation recovery unit of our company is based on the principle of introducing the mixed oil and gas into the plate heat exchanger through an environment far below the oil and gas dew point to liquefy it and collect it through the bottom overflow tank and flow into the oil-water separation tank below for temporary storage. Through our company's field use, we found that the exhaust condensate collection technology as a whole is still insufficient, and the existing problems are as follows:

[0003] (1) As domestic ships generally do not carry out inerting in the cabin, the average oxygen content in the cabin is 15% to 20%. The actual working conditions are inconsistent with the design. Therefore, a large amount of nitrogen needs to be added for dilution when the oil gas is introduced. However, the original design did not take into account the situation where a large amount of non-condensable gas enters the tank. No sealed isolation is set, resulting in a large amount of nitrogen entering the oil-water separation tank, forming an air column in the condensate recovery line, affecting the condensate entering the tank;

[0004] (2) The original design of the pressure relief line from the oil-water separation tank to the catalytic oxidation unit was unreasonable. Since the pressure inside the tank was much higher than the original set pressure relief value of 8 kPa, a large amount of mixed gas formed by nitrogen and volatile organic vapor in the tank entered the catalytic oxidation unit without any treatment, which greatly increased the load of the CO reactor, causing the CO reactor to heat up rapidly or even overheat, seriously affecting the activity of the catalyst, increasing the cost of using the catalyst, and even causing excessive emissions. Utility Model Content

[0005] The technical problem to be solved by the utility model is to address the deficiencies in the prior art and to provide a tail gas condensate collection device which has a simple structure and reasonable design, by adding a liquid inserting sleeve inside the oil-water separation tank for liquid sealing and adjusting the pressure relief direction of the pressure relief pipeline, so as to achieve efficient collection of tail gas condensate, avoid the accumulation of condensate at the bottom of the cold box which accelerates frosting and clogging of the channel, and greatly alleviate the load of the reactor in the catalytic oxidation system and extend the service life of the catalyst.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solution: a tail gas condensate collecting device, the collecting device comprising an oil-water separation tank;

[0007] A plurality of condensate inlets are arranged on the top of the oil-water separation tank, and a delivery pipe of a condenser is externally connected to the condensate inlet;

[0008] A liquid insertion tube is arranged in the oil-water separation tank, and the top end of the liquid insertion tube is connected to the condensate inlet;

[0009] An oil overflow tank, which is fixed on the inner wall at the bottom of the oil-water separation tank;

[0010] A water overflow trough is arranged at the rear of the oil overflow trough, and the notch of the water overflow trough is lower than the notch height of the oil overflow trough;

[0011] It also includes a number of shower valves installed on the bottom wall of the oil-water separation tank;

[0012] It also includes several reserved interfaces installed on the top wall of the oil-water separation tank, one of which is equipped with a pressure relief hard pipe connected to the delivery pipe, and the outlet end of the pressure relief hard pipe is located in front of the condenser.

[0013] The top height of the oil overflow trough is H1, the height of the water overflow trough is H2, and the distance between the top of the oil overflow trough and the bottom of the insertion tube is H3;

[0014] H1 is at least 10% higher than H2;

[0015] H3=[(H1-H2) / 0.3312].

[0016] The technical problem to be solved by the utility model can also be achieved through the following technical solution: in the above-mentioned exhaust condensate collection device, two adjacent condensate inlets are equidistantly arranged.

[0017] The technical problem to be solved by the utility model can also be achieved through the following technical solution: in the above-mentioned exhaust condensate collection device, two adjacent reserved interfaces are equidistantly arranged.

[0018] The technical problem to be solved by the utility model can also be achieved by the following technical solutions: in the above-mentioned tail gas condensate collection device, three shower valves are provided;

[0019] The inlet of at least one shower valve is connected to the oil-water separation tank and is not connected to the bottom wall of the oil overflow tank and the water overflow tank;

[0020] The inlet of at least one shower valve is connected to the bottom wall of the oil overflow tank, so as to drain the oil in the oil overflow tank;

[0021] The inlet of at least one shower valve is connected to the bottom wall of the water overflow trough, so as to drain the water in the water overflow trough.

[0022] Compared with the prior art, the beneficial technical effects of the utility model are:

[0023] (1) By adding a liquid insert tube to each condensate inlet of the oil-water separation tank, the lower end of the liquid insert tube is immersed in the liquid surface of the oil-water separation tank to form a liquid seal, and the oil pressure plugging effectively reduces the amount of non-condensable gas and nitrogen in the oil-water separation tank;

[0024] (2) In order to prevent the volatilization of the liquid in the tank from being directly discharged into the catalytic oxidation unit through the pressure relief line, thereby increasing the load of the CO reactor and causing the catalyst to fail due to over-temperature and exceed the emission standard, a pressure relief hard pipe is installed on the top of the oil-water separation tank to lead the volatilized gas of the liquid in the tank to the front of the condenser and perform unified condensation treatment with the ship-loading tail gas, thereby reducing the load of the CO reactor in the downstream of the oil-water separation tank and at the same time improving the secondary utilization rate of oil and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] In the figure, 1. oil-water separation tank; 2. condensate inlet; 3. condenser; 4. delivery pipe; 5. liquid insertion tube; 6. oil overflow trough; 7. water overflow trough; 8. shower valve; 9. reserved interface; 10. pressure relief hard pipe; 11. liquid level meter. DETAILED DESCRIPTION

[0027] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0028] Example 1, reference Figure 1 , a tail gas condensate collecting device, the collecting device comprising an oil-water separation tank 1;

[0029] A plurality of condensate inlets 2 are provided on the top of the oil-water separation tank 1, and a delivery pipe 4 of a condenser 3 is externally connected to the condensate inlet 2;

[0030] A liquid intubation tube 5 is provided in the oil-water separation tank 1, the top end of the liquid intubation tube 5 is connected to the condensate inlet 2, and two adjacent condensate inlets 2 are arranged at equal distances. By adding one liquid intubation tube 5 to each condensate inlet 2 of the oil-water separation tank 1, the end, i.e., the lower end, of the liquid intubation tube 5 is immersed in the liquid surface of the oil-water separation tank 1 to form a liquid seal, and the amount of non-condensable gas and nitrogen in the oil-water separation tank 1 is effectively reduced by oil pressure plugging;

[0031] It should be noted that the end of the insertion tube 5 is located above the oil-water liquid level layer;

[0032] The oil overflow trough is sealed and fixed on the side wall of the oil-water separation tank on both sides in the radial direction. The bottom is 0.05 meters away from the bottom of the tank. The liquid can only communicate left and right through the bottom of the trough. After the oil flows into the tank from the liquid insertion tube, when the height reaches the height of the oil overflow trough, the oil naturally flows into the oil overflow trough;

[0033] The water overflow trough is arranged at the rear of the oil overflow trough. The notch of the water overflow trough is lower than the notch height of the oil overflow trough. After the oil is put into the tank, under the influence of the communicating vessel principle, in order to achieve the static pressure balance on the left and right sides of the oil overflow trough, the water at the bottom of the left trough will be transferred to the right side through the channel below the oil overflow trough. When the liquid height on the right side reaches the height of the water overflow trough, the water will flow into the water overflow trough;

[0034] It should be noted that: the height of the top of the oil overflow tank 6 is H1, and the height of the top of the water overflow tank 7 is H2. Due to the physical property that the density of the oil in the condensate component is small (0.6688kg / m³), the height of H1 should always be higher than the height of H2. The distance between the top of the oil overflow tank and the bottom of the insertion tube is H3.

[0035] On the one hand, in order to avoid incomplete oil-water separation in the outer wall area of ​​the oil overflow tank 6, which will cause the oil-water mixture to enter the oil overflow tank 6 and reduce the quality of the oil, causing quality problems for subsequent oil recovery, H1 is 10% higher than H2;

[0036] On the other hand, the bottom of the insertion tube 5 should be fully immersed in the oil phase, but not enter the water phase, so as to avoid the condensate from overcoming excessive static pressure of the upper oil when flowing into the tank. According to the physical properties of the oil density of 0.6688kg / m³ and the water density of 1kg / m³ in the condensate, H3=[(H1-H2) / 0.3312] is calculated.

[0037] The water overflow groove 7 is arranged at the rear of the oil overflow groove 6, and is formed into a substantially square groove, and its top surface is open, that is, it has no top. The notch of the water overflow groove 7 is lower than the notch height of the oil overflow groove 6, and its specific height value can be selected according to the use requirements;

[0038] It also includes a plurality of drain valves 8 installed on the bottom wall of the oil-water separation tank 1, which are used to drain the medium;

[0039] It also includes a plurality of reserved interfaces 9 installed on the top wall of the oil-water separation tank 1. The number of the reserved interfaces 9 can be selected according to the use requirements. A pressure relief hard pipe 10 connected to the delivery pipe 4 is installed on one of the reserved interfaces 9. Two adjacent reserved interfaces 9 are equidistantly arranged. The outlet end of the pressure relief hard pipe 10 is located in front of the condenser 3.

[0040] It should be noted that the pressure relief hard pipe 10 can deliver the gas in the tank to the delivery pipe 4, and the gas is condensed again by the condenser 3 on the delivery pipe 4, so as to perform secondary treatment;

[0041] The shower valve 8 is provided with three;

[0042] The inlet of at least one shower valve 8 is connected to the oil-water separation tank 1 and is not connected to the bottom wall of the oil overflow tank 6 and the water overflow tank 7;

[0043] The inlet of at least one drain valve 8 is connected to the bottom wall of the oil overflow tank 6, so as to drain the oil in the oil overflow tank 6;

[0044] The inlet of at least one shower valve 8 is connected to the bottom wall of the water overflow groove 7, so as to drain the water in the water overflow groove 7;

[0045] In addition, three groups of liquid level gauges 11 may be provided on one side of the three shower valves 8 to detect the liquid level in the oil overflow tank 6 , the liquid level in the water overflow tank 7 and the liquid level in the oil-water separation tank 1 respectively.

[0046] When the exhaust condensate collection device is in use:

[0047] First, the tail gas is sent to the condensate inlet 2 of the oil-water separation tank 1 through the delivery pipe 4, and is transported to the oil-water separation tank 1 through the liquid insertion pipe 5. At this time, the oil-water mixture accumulates in the tank, and forms a stratification of upper oil and lower water due to different densities. As the liquid level in the tank rises, and the notch of the water overflow tank 7 is lower than the notch height of the oil overflow tank 6, after the liquid level rises, the upper oil can flow into the oil overflow tank 6, and the lower water can flow into the water overflow tank 7. The residual liquid in the tank, the water in the water overflow tank 7, and the oil in the oil overflow tank 6 can be discharged respectively through the drain valve 8;

[0048] In addition, the pressure relief hard pipe 10 located at the reserved interface 9 can deliver the gas overflowing from the tank to the delivery pipe 4 and be uniformly processed with the exhaust gas on board.

Claims

1. A tail gas condensate collection device, characterized in that: The collection device includes an oil-water separation tank; A plurality of condensate inlets are arranged on the top of the oil-water separation tank, and a delivery pipe of a condenser is externally connected to the condensate inlet; A liquid insertion tube is arranged in the oil-water separation tank, and the top end of the liquid insertion tube is connected to the condensate inlet; The oil overflow trough is sealed and fixed on the side wall of the oil-water separation tank on both sides in the radial direction. The bottom is 0.05 meters away from the bottom of the tank. The liquid can only communicate left and right through the bottom of the trough. After the oil flows into the tank from the liquid insertion tube, when the height reaches the height of the oil overflow trough, the oil naturally flows into the oil overflow trough; The water overflow trough is arranged at the rear of the oil overflow trough. The notch of the water overflow trough is lower than the notch height of the oil overflow trough. After the oil is put into the tank, under the influence of the communicating vessel principle, in order to achieve the static pressure balance on the left and right sides of the oil overflow trough, the water at the bottom of the left trough will be transferred to the right side through the channel below the oil overflow trough. When the liquid height on the right side reaches the height of the water overflow trough, the water will flow into the water overflow trough; It also includes a number of shower valves installed on the bottom wall of the oil-water separation tank; It also includes several reserved interfaces installed on the top wall of the oil-water separation tank, one of which is equipped with a pressure relief hard pipe connected to the delivery pipe, and the outlet end of the pressure relief hard pipe is located in front of the condenser.

2. The exhaust condensate collection device according to claim 1, characterized in that: The top height of the oil overflow trough is H1, the height of the water overflow trough is H2, and the distance between the top of the oil overflow trough and the bottom of the insertion tube is H3; H1 is at least 10% higher than H2; H3=[(H1-H2) / 0.3312]-0.

1.

3. The exhaust condensate collection device according to claim 1, characterized in that: Two adjacent condensate inlets are arranged at equal distances.

4. The exhaust condensate collection device according to claim 1, characterized in that: Two adjacent reserved interfaces are set at an equidistant distance.

5. The exhaust condensate collection device according to claim 1, characterized in that: The shower valves are provided with three; The inlet of at least one shower valve is connected to the oil-water separation tank and is not connected to the bottom wall of the oil overflow tank and the water overflow tank; The inlet of at least one drain valve is connected to the bottom wall of the oil overflow tank, so as to drain the oil in the oil overflow tank; The inlet of at least one shower valve is connected to the bottom wall of the water overflow trough, so as to drain the water in the water overflow trough.

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