Liquid nitrogen cryogenic oil gas recovery heat exchanger test device

Abstract

The utility model discloses a liquid nitrogen cryogenic oil gas recovery heat exchanger testing device, which belongs to the technical field of heat exchangers and mainly comprises a heat exchanger, a gas-liquid separator and the like. The upper end of the tube pass of the heat exchanger is connected with an air inlet pipeline; a first flowmeter, a first thermometer and a first pressure gauge are arranged on the air inlet pipeline; a gas outlet in the side wall of the gas-liquid separator is connected with a gas outlet pipeline; a second flowmeter, a second thermometer and a second pressure gauge are arranged on the gas outlet pipeline; one side of the shell side wall of the heat exchanger communicates with a liquid nitrogen pipeline, a third thermometer is arranged on the liquid nitrogen pipeline, the other side of the shell side wall of the heat exchanger communicates with a nitrogen pipeline, and a fourth thermometer is arranged on the nitrogen pipeline. The flow meters, the thermometers and the pressure gauges are arranged at the hot flow inlet, the hot flow outlet, the cold flow inlet and the cold flow outlet of the heat exchanger, and finally the heat transfer coefficient and the pressure difference of the heat exchanger are measured and calculated, so that the performance parameters of the heat exchanger are measured and evaluated.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a liquid nitrogen deep-cooling oil and gas recovery heat exchanger test device. Background Art

[0002] Oil and gas recovery is to recycle and reuse hydrocarbon organic gases emitted during oil loading and unloading to purify the air and save resources. In the process of loading and unloading finished oil and filling tanks or vehicles with oil, the volatile organic gases are collected, and the volatilization of organic gases is reduced through one or several combined methods in the recovery process such as absorption, adsorption or condensation, or the finished oil gas is converted from gas to liquid and then back to finished oil, so as to achieve the purpose of final reuse and resource saving. In China, with the emphasis on oil and gas recovery of finished oil in recent years, the localization process of condensation recovery equipment has also been accelerated.

[0003] As an indispensable equipment for heat exchange between cold and hot fluids in condensation recovery devices, heat exchangers are used in chemical, petroleum, power, food and other sectors. At present, with the continuous development of heat exchangers, there are more and more types and higher complexity, and it is also necessary to measure the overall performance parameters of heat exchangers.

[0004] To this end, the utility model proposes a liquid nitrogen deep-cooling oil and gas recovery heat exchanger test device. Utility Model Content

[0005] The utility model aims to provide a liquid nitrogen deep-cooling oil and gas recovery heat exchanger test device, which can measure the performance parameters of the heat exchanger.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid nitrogen cryogenic oil and gas recovery heat exchanger test device, comprising a heat exchanger and a gas-liquid separator;

[0008] The upper end of the tube side of the heat exchanger is connected to an air intake pipeline, and the air intake pipeline is provided with a first flow meter, a first thermometer and a first pressure gauge;

[0009] The lower end of the tube side of the heat exchanger is connected to the upper end of the gas-liquid separator, the side wall gas outlet of the gas-liquid separator is connected to an outlet pipeline, and the outlet pipeline is provided with a second flow meter, a second thermometer and a second pressure gauge;

[0010] One side of the shell side wall of the heat exchanger is connected to a liquid nitrogen pipeline, and a third thermometer is arranged on the liquid nitrogen pipeline. The other side of the shell side wall of the heat exchanger is connected to a nitrogen pipeline, and a fourth thermometer is arranged on the nitrogen pipeline.

[0011] Preferably, the air intake pipeline is connected to an oil and gas generating unit, the oil and gas generating unit is used to generate a gasoline-air mixture and transport it to the heat exchanger, and the oil and gas generating unit includes an external air pipeline, a solvent barrel, a temperature control heater and a constant temperature water tank;

[0012] The outside air pipeline is connected with the air inlet of the solvent barrel, and the outside air pipeline is used to transport air into the solvent barrel; gasoline is contained in the solvent barrel, and the solvent barrel is placed in the constant temperature water tank, and water is contained in the constant temperature water tank; the constant temperature water tank is equipped with the temperature control heater, and the temperature control heater is used to heat the water contained in the constant temperature water tank; the top air outlet of the solvent barrel is connected with a gasoline-air mixed gas pipeline, and an oil and gas conveying fan is arranged on the gasoline-air mixed gas pipeline, and the gasoline-air mixed gas pipeline is connected with the air inlet pipeline.

[0013] Preferably, an air delivery fan is provided on the external air pipeline.

[0014] Preferably, the temperature of the water source contained in the constant temperature water tank is set to 40°C.

[0015] Preferably, one end of the bottom liquid outlet of the gas-liquid separator is connected to a condensate pipeline.

[0016] Preferably, an automatic control valve is provided on the liquid nitrogen pipeline.

[0017] Preferably, the air inlet pipeline is provided with a first sampling valve, and the air outlet pipeline is provided with a second sampling valve.

[0018] Preferably, a flame arrester is also provided on the gasoline-air mixture pipeline.

[0019] The beneficial effects of the utility model are as follows:

[0020] The utility model proposes a liquid nitrogen deep-cold oil and gas recovery heat exchanger test device. By arranging and installing flow meters, thermometers and pressure gauges at the hot flow inlet, hot flow outlet, cold flow inlet and cold flow outlet of the heat exchanger, relevant data such as temperature, pressure and flow rate are obtained, and finally the heat transfer coefficient K and the pressure difference △p of the heat exchanger are measured and calculated, so as to measure and evaluate the performance parameters of the heat exchanger; a gasoline-air mixed gas is generated by an oil and gas generation unit, and is transported to the heat exchanger through a gasoline-air mixed gas pipeline, and a flame arrester is arranged on the pipeline to prevent the flame of flammable gas and flammable liquid vapor from spreading, so as to ensure the personal safety of personnel and prevent accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural relationship connection diagram of the utility model;

[0022] Among them, 1-heat exchanger, 10-gas-liquid separator;

[0023] Oil and gas generation unit: 101-external air pipeline, 102-solvent barrel, 103-constant temperature water tank, 104-temperature control heater; 105-gasoline-air mixture pipeline, 106-flame arrester, 107-oil and gas delivery fan;

[0024] 11-intake pipeline, 111-first flow meter, 112-first sampling valve, 113-first thermometer, 114-first pressure gauge;

[0025] 12-air outlet pipeline, 121-second flow meter, 122-second sampling valve, 123-second thermometer, 124-second pressure gauge;

[0026] 13- condensate pipeline;

[0027] 21 - liquid nitrogen pipeline, 22 - automatic control valve, 23 - third thermometer, 24 - nitrogen pipeline, 25 - fourth thermometer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Combination Figure 1 As shown, the utility model proposes a liquid nitrogen cryogenic oil and gas recovery heat exchanger test device, which mainly includes structural components such as a heat exchanger 1 and a gas-liquid separator 10. The test device can be used to calculate and measure the performance parameters of the heat exchanger 1.

[0031] The upper end of the tube side of the heat exchanger 1 (heat flow inlet) is connected to an oil and gas generation unit through an air intake pipeline 11, and the oil and gas generation unit is used to generate a gasoline-air mixture and transport it to the heat exchanger 1. The oil and gas generation unit includes structural components such as an external air pipeline 101, a solvent barrel 102, a constant temperature water tank 103, and a temperature control heater 104.

[0032] The outside air pipeline 101 is connected to the air inlet of the solvent barrel 102, and an air delivery fan is provided on the outside air pipeline 101. The outside air pipeline 101 can deliver saturated humid air to the solvent barrel 102 through the air delivery fan. Gasoline is contained in the solvent barrel 102, and the solvent barrel 102 is placed in a constant temperature water tank 103, and a water source is contained in the constant temperature water tank 103. The constant temperature water tank 103 is equipped with a temperature control heater 104, and the temperature control heater 104 is used to heat the water source contained in the constant temperature water tank 103, and the temperature of the water source contained in the constant temperature water tank 103 is set to 40°C.

[0033] Air is delivered into the solvent barrel 102 from the external air pipeline 101 through the air delivery fan. When the air contacts with gasoline, bubbles are formed and rise to the liquid surface. At the same time, the temperature control heater 104 is used to heat the constant temperature water tank 103 and keep the water temperature at 40°C. Due to the evaporation of gasoline on the bubble surface and the liquid surface, a gasoline-air mixture is formed.

[0034] The top gas outlet of the solvent barrel 102 is connected to a gasoline-air mixed gas pipeline 105, on which an oil and gas delivery fan 107 is provided, and the gasoline-air mixed gas pipeline 105 is connected to the air intake pipeline 11. A flame arrester 106 is also provided on the gasoline-air mixed gas pipeline 105, which can be used to prevent the flame of flammable gas and flammable liquid vapor from spreading, prevent accidents, and ensure the life and health safety of personnel.

[0035] The air intake pipeline 11 is provided with structural components such as a first flow meter 111, a first thermometer 113 and a first pressure gauge 114, which can obtain data such as the flow rate, temperature and pressure of the oil and gas at the heat flow inlet of the heat exchanger 1. The air intake pipeline 11 is also provided with a first sampling valve 112, which can sample the oil and gas.

[0036] The lower end of the tube side of the heat exchanger 1 (hot flow outlet) is connected to the upper end of the gas-liquid separator 10, and the gas-liquid separator 10 can separate the gas phase and the liquid phase. The side wall gas outlet of the gas-liquid separator 10 is connected to the gas outlet pipeline 12, and the gas outlet pipeline 12 is provided with structural components such as a second flowmeter 121, a second thermometer 123 and a second pressure gauge 124, which can obtain data such as the flow rate, temperature and pressure of the oil and gas at the hot flow outlet of the heat exchanger 1. A second sampling valve 122 is provided on the gas outlet pipeline 12, which can sample the oil and gas. One end of the bottom liquid outlet of the gas-liquid separator 10 is connected to the condensate pipeline 13.

[0037] One side of the shell side wall of the heat exchanger 1 (cold flow inlet) is connected to a liquid nitrogen pipeline 21, and a third thermometer 23 is provided on the liquid nitrogen pipeline 21, which can measure the temperature at the cold flow inlet of the heat exchanger 1. An automatic control valve 22 is provided on the liquid nitrogen pipeline 21, and the automatic control valve 22 can be used to control the flow of liquid nitrogen, thereby controlling the condensation temperature. The other side of the shell side wall of the heat exchanger 1 (cold flow outlet) is connected to a nitrogen pipeline 24, and a fourth thermometer 25 is provided on the nitrogen pipeline 24, and the cold flow outlet temperature of the heat exchanger 1 can be measured by the fourth thermometer 25.

[0038] The operation process of the utility model is as follows:

[0039] Open the automatic control valve 22 of the liquid nitrogen pipeline 21, and use liquid nitrogen to precool the heat exchanger 1; when the precooling temperature is reached, turn on the temperature control heater 104 to heat the water source of the constant temperature water tank 103, and keep the water temperature stable at 40°C, and turn on the oil and gas delivery fan 107 at the same time; adjust the opening of the outlet valve of the oil and gas delivery fan 107 to ensure that the flow reading of the first flow meter 111 at the fan outlet is stable; adjust the opening of the automatic control valve 22 of the liquid nitrogen pipeline 21 to control the liquid nitrogen flow, thereby controlling the condensation temperature. Record the relevant test data during the test, and defrost in time if frost blockage is found.

[0040] Air is sent from the outside air pipeline 101 to the solvent barrel 102 through the air delivery fan, forming bubbles that rise to the liquid surface; at the same time, the temperature control heater 104 is used to heat the constant temperature water tank 103 to keep the water temperature at 40°C. Due to the evaporation of the gas phase of gasoline on the bubble surface and the liquid surface, a gasoline-air mixture is formed, which is transported to the heat exchanger 1 through the gasoline-air mixture pipeline 105 for testing. The escaping oil and gas are transported to the upper air inlet (hot flow inlet) of the tube side of the heat exchanger 1 by the oil and gas delivery fan 107 through the gasoline-air mixture pipeline 105; after condensation treatment, the oil and gas pass through the gas-liquid separator 10, and the gas phase is discharged through the gas outlet pipeline 12, and the liquid phase is discharged through the condensate pipeline 13. The liquid nitrogen pipeline 21 is connected to one side of the shell side wall of the heat exchanger 1 (cold flow inlet), and is discharged through the nitrogen pipeline 24, and the nitrogen pipeline 24 is connected to the other side of the shell side wall of the heat exchanger 1 (cold flow outlet).

[0041] According to the experimental measurement data, the hot flow inlet temperature T1 is obtained by the first thermometer 113, the hot flow outlet temperature T2 is obtained by the second thermometer 123, the cold flow inlet temperature t1 is obtained by the third thermometer 23, the cold flow outlet temperature t2 is obtained by the fourth thermometer 25, the fluid volume V is measured by the first flowmeter 111 and the second flowmeter 121, the pressure P1 is obtained by the first pressure gauge 114, and the pressure P2 is obtained by the second pressure gauge 124, thereby obtaining the total heat transfer coefficient K and the pressure difference △p of the heat exchanger 1:

[0042] Overall heat transfer coefficient K:

[0043] K=Q T / (S△t m ),

[0044] Among them, Q T is the heat load of the heat exchanger, S is the heat exchange area of ​​the heat exchanger (the heat exchange area of ​​the heat exchanger used in this embodiment is S = 8.68m 2 ), △t m is the mean temperature difference;

[0045] Heat load Q T :

[0046] Q T =VρC△t,

[0047] Among them, V is the volume of the fluid, ρ is the density of the fluid, C is the specific heat capacity at constant pressure, △t is the temperature difference between the cold and hot fluids at both ends of the heat exchanger, △t = T1-T2 or △t = t2-t1, which is selected according to actual calculations.

[0048] Average temperature difference △t m :

[0049] △t m =(△t1-△t2) / ln(△t1 / △t2),

[0050] Among them, △t1=T1–t2, △t2=T2–t1;

[0051] Pressure difference △p: △p=P1-P2, thereby finally obtaining the total heat transfer coefficient K and pressure difference △p of the heat exchanger 1. Different heat exchangers 1 can be replaced to evaluate the performance of the heat exchanger.

[0052] Of course, the above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model and should be protected by the utility model.

Claims

1. A liquid nitrogen cryogenic oil and gas recovery heat exchanger test device, characterized in that: Including heat exchanger and gas-liquid separator; The upper end of the tube side of the heat exchanger is connected to an air intake pipeline, and the air intake pipeline is provided with a first flow meter, a first thermometer and a first pressure gauge; The lower end of the tube side of the heat exchanger is connected to the upper end of the gas-liquid separator, and the side wall gas outlet of the gas-liquid separator is connected to an outlet pipeline, and the outlet pipeline is provided with a second flow meter, a second thermometer and a second pressure gauge; One side of the shell side wall of the heat exchanger is connected to a liquid nitrogen pipeline, and a third thermometer is provided on the liquid nitrogen pipeline. The other side of the shell side wall of the heat exchanger is connected to a nitrogen pipeline, and a fourth thermometer is provided on the nitrogen pipeline.

2. A liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 1, characterized in that: The air intake pipeline is connected to an oil and gas generating unit, which is used to generate a gasoline-air mixture and transport it to the heat exchanger. The oil and gas generating unit includes an external air pipeline, a solvent barrel, a temperature-controlled heater, and a constant temperature water tank; The outside air pipeline is connected to the air inlet of the solvent barrel, and the outside air pipeline is used to transport air into the solvent barrel; Gasoline is contained in the solvent barrel, which is placed in the constant temperature water tank, which contains water. The constant temperature water tank is equipped with the temperature control heater, which is used to heat the water in the constant temperature water tank. The top air outlet of the solvent barrel is connected to a gasoline-air mixed gas pipeline, an oil and gas delivery blower is provided on the gasoline-air mixed gas pipeline, and the gasoline-air mixed gas pipeline is connected to the air inlet pipeline.

3. A liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 2, characterized in that: An air delivery fan is provided on the external air pipeline.

4. The liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 2, characterized in that: The temperature of the water source contained in the constant temperature water tank is set to 40°C.

5. The liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 1, characterized in that: One end of the bottom liquid outlet of the gas-liquid separator is connected to a condensate pipeline.

6. The liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 1, characterized in that: The liquid nitrogen pipeline is provided with an automatic control valve.

7. The liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 1, characterized in that: The air inlet pipeline is provided with a first sampling valve, and the air outlet pipeline is provided with a second sampling valve.

8. The liquid nitrogen cryogenic oil and gas recovery heat exchanger test device according to claim 2, characterized in that: A flame arrester is also provided on the gasoline-air mixture pipeline.

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