Low-temperature liquid vaporization device based on engine waste heat recovery

Abstract

The utility model discloses a low-temperature liquid vaporization device based on engine waste heat recovery, which belongs to the technical field of oil and gas field exploitation and comprises a diesel engine, an exhaust radiator, a hot air heat exchanger and a smoke exhaust heat exchanger. The exhaust radiator is connected to the right side of the diesel engine, the hot air heat exchanger is connected with the right side of the exhaust radiator through a flow guide cover, the smoke exhaust heat exchanger is located above the hot air heat exchanger, a smoke exhaust pipe is fixedly connected to the top of a shell of the smoke exhaust heat exchanger, and the left side of the shell of the smoke exhaust heat exchanger is connected with a smoke outlet pipe of the diesel engine through a smoke exhaust main pipe. The device has the advantages that the low-temperature liquid is heated through the sleeve cylinder water waste heat and the exhaust smoke waste heat generated when the diesel engine works, temperature rising gasification of the low-temperature liquid is achieved, on one hand, the waste heat can be recycled, energy waste is avoided, on the other hand, the temperature of the sleeve cylinder water can be reduced, and energy is saved. Therefore, the cooling effect on the diesel engine is improved, and the working efficiency of the diesel engine is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field development technology, specifically to a cryogenic liquid vaporization device based on engine waste heat recovery. Background Technology

[0002] Nitrogen and carbon dioxide injection processes in oilfields are among the most economical methods for enhancing oil and gas recovery. These processes often require large volumes of high-pressure gas, typically achieved by pressurizing cryogenic liquids such as liquid nitrogen or liquid carbon dioxide using pumping equipment (diesel-driven or electric-driven), followed by heating and vaporization. The vaporization of cryogenic liquids requires a significant amount of heat, usually generated by heat-generating equipment such as electric heating, steam heat exchange, or combustion heat exchange.

[0003] The following problems exist:

[0004] Firstly, when diesel is used, the diesel engine generates a lot of heat, which results in the cooling water in the diesel engine cylinder having a higher temperature. The higher temperature of the cooling water reduces its cooling effect on the diesel engine, thereby reducing the working efficiency of the diesel engine.

[0005] Secondly, after the cooling water heats up, its heat cannot be effectively utilized, and the heat in the high-temperature flue gas discharged from the diesel engine also cannot be effectively utilized, thus leading to energy waste. Utility Model Content

[0006] To solve the above problems, this utility model provides a cryogenic liquid vaporization device based on engine waste heat recovery. This utility model is achieved through the following technical solution.

[0007] A cryogenic liquid vaporization device based on engine waste heat recovery includes a diesel engine, and further includes an exhaust radiator, a hot air heat exchanger, and a smoke exhaust heat exchanger. The exhaust radiator is connected to the right side of the diesel engine and is used to draw in cold air from the outside, pass it through the cylinder of the diesel engine, and generate hot air blown to the right. The hot air heat exchanger is connected to the right side of the exhaust radiator through a guide shroud. The hot air heat exchanger has a first coil inside, and the bottom of the first coil is connected to a liquid inlet pipe. The smoke exhaust heat exchanger is located above the hot air heat exchanger and has a second coil inside. The bottom of the second coil is connected to the top of the first coil, and the top of the second coil is connected to an exhaust pipe. An exhaust pipe is fixed to the top of the shell of the smoke exhaust heat exchanger, and the left side of the shell of the smoke exhaust heat exchanger is connected to the exhaust pipe of the diesel engine through the exhaust pipe.

[0008] Furthermore, a smoke guide baffle is fixedly connected inside the shell of the flue gas heat exchanger. The smoke guide baffle is fixedly connected to the inner wall of the top plate and bottom plate of the flue gas heat exchanger shell, and the smoke guide baffles on the upper and lower sides are arranged alternately.

[0009] Furthermore, a secondary exhaust pipe is connected between the main exhaust pipe and the exhaust pipe, a flue gas regulator is fixedly connected to the secondary exhaust pipe, and a temperature transmitter is fixedly connected to the main exhaust pipe.

[0010] Furthermore, a pressure transmitter is fixedly connected to the exhaust pipe, and a solenoid valve is fixedly connected to the inlet pipe.

[0011] Furthermore, a resistance heater is fixedly connected to the head of the exhaust main pipe, and staggered resistance heating plates are fixedly connected inside the resistance heater. An exhaust secondary pipe is fixedly connected to the right side of the housing of the resistance heater.

[0012] Furthermore, it also includes a PLC controller, the power interface of which is electrically connected to an external power source, the signal input terminals of which are electrically connected to a temperature transmitter and a pressure transmitter, respectively, and the control output terminals of which are electrically connected to a resistance heater, a flue gas regulator, and a solenoid valve, respectively.

[0013] A cryogenic liquid vaporization method based on engine waste heat recovery includes the following steps:

[0014] S1, start the diesel engine and exhaust radiator, and pump the cryogenic liquid from the inlet pipe through the diesel engine;

[0015] S2, the cryogenic liquid is heated by a hot air heat exchanger and a flue gas heat exchanger respectively;

[0016] S3 measures the gas in the exhaust pipe through temperature and pressure transmitters and feeds the measurement results back to the PLC controller.

[0017] S4, the PLC controller controls the resistance heater, flue gas regulator and solenoid valve based on the received data.

[0018] The beneficial effects of this utility model are that it utilizes the waste heat of the cylinder liner water and exhaust gas generated during the operation of the diesel engine to heat the cryogenic liquid, thereby achieving the heating and vaporization of the cryogenic liquid. On the one hand, the waste heat can be recovered and utilized, thus avoiding energy waste; on the other hand, the temperature of the cylinder liner water can be reduced, thereby improving the cooling effect on the diesel engine and increasing the working efficiency of the diesel engine. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 : A schematic diagram of the structure of a cryogenic liquid vaporization device based on engine waste heat recovery according to this utility model;

[0021] Figure 2 : A circuit connection diagram of the PLC controller described in this utility model.

[0022] The attached figures are labeled as follows:

[0023] 1-Diesel engine, 2-Exhaust radiator, 3-Hot air heat exchanger, 4-Smoke heat exchanger, 5-Guide shroud, 6-First coil, 7-Liquid inlet pipe, 8-Second coil, 9-Exhaust main pipe, 10-Smoke pipe, 11-Smoke main pipe, 12-Smoke baffle, 13-Smoke auxiliary pipe, 14-Flue gas regulator, 15-Temperature transmitter, 16-Pressure transmitter, 17-Solenoid valve, 18-Resistance heater, 19-Resistance heating plate, 20-Exhaust auxiliary pipe, 21-PLC controller, 22-External power supply. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-2 As shown, a cryogenic liquid vaporization device based on engine waste heat recovery includes a diesel engine 1, an exhaust radiator 2, a hot air heat exchanger 3, and a smoke exhaust heat exchanger 4. The exhaust radiator 2 is connected to the right side of the diesel engine 1. The exhaust radiator 2 is used to draw in cold air from the outside, pass it through the cylinder of the diesel engine 1, and generate hot air blown to the right. The hot air heat exchanger 3 is connected to the right side of the exhaust radiator 2 through a guide shroud 5. The hot air heat exchanger 3 is provided with a first coil 6, and the bottom of the first coil 6 is connected to a liquid inlet pipe 7. The smoke exhaust heat exchanger 4 is located above the hot air heat exchanger 3. The smoke exhaust heat exchanger 4 is provided with a second coil 8, the bottom of the second coil 8 is connected to the top of the first coil 6, and the top of the second coil 8 is connected to an exhaust pipe 9. An exhaust pipe 10 is fixedly connected to the top of the shell of the smoke exhaust heat exchanger 4. The left side of the shell of the smoke exhaust heat exchanger 4 is connected to the exhaust pipe of the diesel engine 1 through the exhaust pipe 11.

[0026] Preferably, a smoke guide baffle 12 is fixedly connected inside the shell of the flue gas heat exchanger 4. The smoke guide baffle 12 is fixedly connected to the inner wall of the top plate and bottom plate of the shell of the flue gas heat exchanger 4, and the smoke guide baffles 12 on the upper and lower sides are arranged alternately.

[0027] Preferably, a secondary exhaust pipe 13 is connected between the main exhaust pipe 11 and the exhaust pipe 10, a flue gas regulator 14 is fixedly connected to the secondary exhaust pipe 13, and a temperature transmitter 15 is fixedly connected to the main exhaust pipe 9.

[0028] Preferably, a pressure transmitter 16 is fixedly connected to the exhaust pipe 9, and a solenoid valve 17 is fixedly connected to the liquid inlet pipe 7.

[0029] Preferably, a resistance heater 18 is fixedly connected to the head of the exhaust main pipe 9, and staggered resistance heating plates 19 are fixedly connected inside the resistance heater 18. An exhaust secondary pipe 20 is fixedly connected to the right side of the housing of the resistance heater 18.

[0030] Preferably, it also includes a PLC controller 21, the power interface of which is electrically connected to an external power supply 22, the signal input terminals of which are electrically connected to a temperature transmitter 15 and a pressure transmitter 16, respectively, and the control output terminals of which are electrically connected to a resistance heater 18, a flue gas regulator 14 and a solenoid valve 17, respectively.

[0031] A cryogenic liquid vaporization method based on engine waste heat recovery includes the following steps:

[0032] S1, start the diesel engine 1 and the exhaust radiator 2, and pump the cryogenic liquid from the inlet pipe 7 through the diesel engine 1.

[0033] like Figure 1 As shown, when the diesel engine 1 is working, it generates power, thereby pumping cryogenic liquid into the inlet pipe 7. When the diesel engine 1 is working, the cooling water in its cylinder absorbs the heat generated by the diesel engine and rises in temperature. When the exhaust radiator 2 is working, it draws in external air and heats it through the cylinder wall, thereby heating the outside air and lowering the temperature of the cooling water. This makes the cooling water have a better heat absorption effect, cools down the diesel engine 1, and improves its working efficiency.

[0034] S2, the cryogenic liquid is heated by the hot air heat exchanger 3 and the flue gas heat exchanger 4 respectively.

[0035] like Figure 1 As shown, the exhaust radiator 2 generates hot air to the right. The hot air flows out through the guide shroud 5 and the hot air heat exchanger 3. The low-temperature liquid undergoes initial heating when flowing in the first coil 6. After the initial heating, the low-temperature liquid enters the second coil 8.

[0036] When the diesel engine 1 is working, it produces high-temperature flue gas. Part of this high-temperature flue gas enters the exhaust heat exchanger 4 through the exhaust main pipe 11, where it heats up the low-temperature liquid in the second pipe again, causing it to vaporize. The flue gas in the exhaust heat exchanger 4 is discharged through the exhaust pipe 10. The other part of the high-temperature flue gas is discharged directly through the exhaust auxiliary pipe 13 and the exhaust pipe 10.

[0037] After vaporization, the cryogenic liquid enters the resistance heater 18 through the exhaust pipe 9. If the vaporization is incomplete and the temperature is still low, the resistance heating plate 19 can heat and vaporize it a third time. After complete vaporization, it is discharged from the exhaust side pipe 20.

[0038] S3, the gas in the exhaust pipe 9 is measured by temperature transmitter 15 and pressure transmitter 16, and the measurement results are fed back to PLC controller 21.

[0039] S4, PLC controller 21 controls the resistance heater 18, flue gas regulator 14 and solenoid valve 17 according to the received data.

[0040] like Figure 2 As shown, temperature transmitter 15 and pressure transmitter 16 measure the temperature and pressure at the exhaust pipe 9 and input the measurement results to PLC controller 21. PLC controller 21 controls the resistance heater 18, flue gas regulator 14 and solenoid valve 17 based on the received measurement data and compares it with the built-in threshold.

[0041] When the temperature detected by temperature transmitter 15 is low, it indicates that the liquid vaporization is incomplete. At this time:

[0042] 1. Control the operation of the resistance heater 18 to perform reheating and vaporization;

[0043] 2. Control the flue gas regulator 14 to reduce the flow rate of high-temperature flue gas in the exhaust pipe 13, so that more high-temperature flue gas enters the exhaust heat exchanger 4.

[0044] 3. Control solenoid valve 17 to slow down the entry speed of cryogenic liquid.

[0045] When the temperature transmitter 15 detects a high temperature, the resistance heater 18 does not work; the flow rate of high-temperature flue gas in the exhaust pipe 13 increases; and the pumping speed of the cryogenic liquid decreases.

[0046] When the pressure detected by pressure transmitter 16 is high:

[0047] 1. Resistance heater 18 is not working;

[0048] 2. Increase the flow rate of high-temperature flue gas in the exhaust pipe 13 by means of flue gas regulator 14;

[0049] 3. Increase the pumping speed of cryogenic liquid by using solenoid valve 17.

[0050] When the pressure transmitter 16 detects a low pressure, the resistance heater 18 operates; the flow rate of high-temperature flue gas in the exhaust pipe 13 is reduced by the flue gas regulator 14; and the pumping speed of the cryogenic liquid is reduced by the solenoid valve 17.

[0051] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A cryogenic liquid vaporization device based on engine waste heat recovery, comprising a diesel engine, characterized in that, It also includes an exhaust radiator, a hot air heat exchanger, and a smoke exhaust heat exchanger; the exhaust radiator is connected to the right side of the diesel engine, and is used to draw in cold air from the outside, pass it through the cylinder of the diesel engine, and generate hot air blown to the right. The hot air heat exchanger is connected to the right side of the exhaust radiator through a guide shroud. The hot air heat exchanger has a first coil inside, and the bottom of the first coil is connected to a liquid inlet pipe. The smoke exhaust heat exchanger is located above the hot air heat exchanger, and has a second coil inside. The bottom of the second coil is connected to the top of the first coil, and the top of the second coil is connected to an exhaust pipe. An exhaust pipe is fixed to the top of the shell of the smoke exhaust heat exchanger, and the left side of the shell of the smoke exhaust heat exchanger is connected to the exhaust pipe of the diesel engine through the exhaust pipe.

2. The cryogenic liquid vaporization device based on engine waste heat recovery according to claim 1, characterized in that, A smoke guide baffle is fixedly connected inside the shell of the flue gas heat exchanger. The smoke guide baffle is fixedly connected to the inner wall of the top plate and bottom plate of the flue gas heat exchanger shell, and the smoke guide baffles on the upper and lower sides are arranged alternately.

3. The cryogenic liquid vaporization device based on engine waste heat recovery according to claim 1, characterized in that, A secondary exhaust pipe is connected between the main exhaust pipe and the exhaust pipe. A flue gas regulator is fixedly connected to the secondary exhaust pipe, and a temperature transmitter is fixedly connected to the main exhaust pipe.

4. A cryogenic liquid vaporization device based on engine waste heat recovery according to claim 3, characterized in that, A pressure transmitter is fixedly connected to the exhaust pipe, and a solenoid valve is fixedly connected to the inlet pipe.

5. A cryogenic liquid vaporization device based on engine waste heat recovery according to claim 4, characterized in that, A resistance heater is fixedly connected to the head of the main exhaust pipe, and staggered resistance heating plates are fixedly connected inside the resistance heater. An exhaust secondary pipe is fixedly connected to the right side of the housing of the resistance heater.

6. A cryogenic liquid vaporization device based on engine waste heat recovery according to claim 5, characterized in that, It also includes a PLC controller, whose power interface is electrically connected to an external power source, whose signal input terminals are electrically connected to a temperature transmitter and a pressure transmitter, and whose control output terminals are electrically connected to a resistance heater, a flue gas regulator, and a solenoid valve.

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