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

Abstract

The invention 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 system has the beneficial effects that the low-temperature liquid is heated by using the sleeve cylinder water waste heat and the exhaust smoke waste heat generated when the diesel engine works, so that the temperature rise gasification of the low-temperature liquid is realized, on one hand, the waste heat can be recycled to avoid the waste of energy, on the other hand, the temperature of the sleeve cylinder water can be reduced, and the energy consumption is reduced. Therefore, the cooling effect on the diesel engine is improved, and the working efficiency of the diesel engine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field exploitation, and in particular to a low-temperature liquid vaporization device and method based on engine waste heat recovery. Background Art

[0002] Oilfield nitrogen and carbon dioxide injection processes are currently one of the economical methods to improve oil and gas recovery. During the construction process, a large amount of high-pressure gas is often required. Usually, low-temperature liquids such as liquid nitrogen or liquid carbon dioxide are pressurized by pumping equipment (diesel drive or electric drive), and then heated and vaporized to achieve the purpose of large-volume high-pressure gas. The heating and vaporization of low-temperature liquids requires a large amount of heat, which is generally achieved through heat-generating equipment, such as electric heating, steam heat exchange, combustion heat exchange, etc.

[0003] There are the following problems: First, when diesel drive is used, the diesel engine will generate a lot of heat, which causes the cooling water in the diesel engine cylinder to have a higher temperature. The higher temperature of the cooling water makes its cooling effect on the diesel engine worse, thereby reducing the working efficiency of the diesel engine.

[0004] Secondly, after the cooling water is heated up, its heat cannot be effectively utilized, and the heat in the high-temperature flue gas exhausted by the diesel engine cannot be effectively utilized, which leads to a waste of energy. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a low-temperature liquid vaporization device and method based on engine waste heat recovery, and the present invention is achieved through the following technical solutions.

[0006] The exhaust fan of the present invention is connected with the exhaust fan of the present invention, and the exhaust fan of the present invention is connected with the exhaust fan of the present invention.

[0007] Furthermore, a smoke guide baffle is fixedly connected inside the shell of the smoke exhaust heat exchanger. The smoke guide baffle is fixedly connected to the top plate and the inner wall of the bottom plate of the shell of the smoke exhaust heat exchanger, and the smoke guide baffles on the upper and lower sides are arranged alternately.

[0008] Furthermore, a smoke exhaust auxiliary pipe is connected between the smoke exhaust main pipe and the smoke exhaust pipe, a smoke regulator is fixedly connected to the smoke exhaust auxiliary pipe, and a temperature transmitter is fixedly connected to the exhaust main pipe.

[0009] Furthermore, a pressure transmitter is fixedly connected to the exhaust main pipe, and a solenoid valve is fixedly connected to the liquid inlet pipe.

[0010] Furthermore, a resistance heater is fixedly connected to the head of the exhaust main pipe, staggered resistance heating plates are fixedly connected inside the resistance heater, and an exhaust sub-pipe is fixedly connected to the right side of the shell of the resistance heater.

[0011] Furthermore, it also includes a PLC controller, wherein the power interface of the PLC controller is electrically connected to the external power supply, the signal input end of the PLC controller is electrically connected to the temperature transmitter and the pressure transmitter, and the control output end of the PLC controller is electrically connected to the resistance heater, the flue gas regulator and the solenoid valve.

[0012] A cryogenic liquid vaporization method based on engine waste heat recovery comprises the following steps: S1, start the diesel engine and the exhaust radiator, and pump the cryogenic liquid from the liquid inlet pipe through the diesel engine; S2, the cryogenic liquid is heated by a hot air heat exchanger and a smoke exhaust heat exchanger respectively; S3, measuring the gas in the exhaust pipe through the temperature transmitter and the pressure transmitter, and feeding back the measurement results to the PLC controller; S4, the PLC controller controls the resistance heater, the flue gas regulator and the solenoid valve according to the received data.

[0013] The beneficial effect of the present invention is that the waste heat of the cylinder water and the exhaust gas generated when the diesel engine is working is used to heat the low-temperature liquid, thereby realizing the temperature rise and gasification of the low-temperature liquid. On the one hand, the waste heat can be recycled to avoid energy waste, and on the other hand, the temperature of the cylinder water can be reduced, thereby improving the cooling effect on the diesel engine and improving the working efficiency of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 : A schematic structural diagram of a cryogenic liquid vaporization device based on engine waste heat recovery according to the present invention; Figure 2: Circuit connection diagram of the PLC controller described in the present invention.

[0016] The reference numerals are as follows: 1-diesel engine, 2-exhaust radiator, 3-hot air heat exchanger, 4-exhaust smoke heat exchanger, 5-air deflector, 6-first coil, 7-liquid inlet pipe, 8-second coil, 9-exhaust main pipe, 10-exhaust pipe, 11-exhaust main pipe, 12-smoke guide baffle, 13-exhaust auxiliary pipe, 14-smoke 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 DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1-2 As shown, a low-temperature 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, and the exhaust radiator 2 is used to draw cold air from the outside through the cylinder of the diesel engine 1 and generate hot air blowing to the right side, the hot air heat exchanger 3 is connected to the right side of the exhaust radiator 2 through a deflector 5, a first coil 6 is arranged in the hot air heat exchanger 3, and a liquid inlet pipe 7 is connected to the bottom of the first coil 6, the smoke exhaust heat exchanger 4 is located above the hot air heat exchanger 3, a second coil 8 is arranged in the smoke exhaust heat exchanger 4, 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 main pipe 9, an exhaust pipe 10 is fixedly connected to the top of the shell of the smoke exhaust heat exchanger 4, and the left side of the shell of the smoke exhaust heat exchanger 4 is connected to the smoke outlet pipe of the diesel engine 1 through the exhaust main pipe 11.

[0019] Preferably, a smoke guide baffle 12 is fixedly connected in the shell of the smoke exhaust heat exchanger 4, and the smoke guide baffle 12 is fixedly connected to the top plate and the inner wall of the bottom plate of the shell of the smoke exhaust heat exchanger 4, and the smoke guide baffles 12 on the upper and lower sides are arranged alternately.

[0020] Preferably, a smoke exhaust auxiliary pipe 13 is connected between the smoke exhaust main pipe 11 and the smoke exhaust pipe 10 , a smoke conditioner 14 is fixedly connected to the smoke exhaust auxiliary pipe 13 , and a temperature transmitter 15 is fixedly connected to the exhaust main pipe 9 .

[0021] Preferably, a pressure transmitter 16 is fixedly connected to the exhaust main pipe 9 , and a solenoid valve 17 is fixedly connected to the liquid inlet pipe 7 .

[0022] Preferably, a resistance heater 18 is fixedly connected to the head of the exhaust main pipe 9 , staggered resistance heating plates 19 are fixedly connected inside the resistance heater 18 , and an exhaust sub-pipe 20 is fixedly connected to the right side of the shell of the resistance heater 18 .

[0023] Preferably, it also includes a PLC controller 21, the power interface of the PLC controller 21 is electrically connected to the external power supply 22, the signal input end of the PLC controller 21 is electrically connected to the temperature transmitter 15 and the pressure transmitter 16, and the control output end of the PLC controller 21 is electrically connected to the resistance heater 18, the flue gas regulator 14 and the solenoid valve 17.

[0024] A cryogenic liquid vaporization method based on engine waste heat recovery comprises the following steps: S1, start the diesel engine 1 and the exhaust radiator 2, and pump the low-temperature liquid into the diesel engine 1 from the liquid inlet pipe 7.

[0025] like Figure 1 As shown, the diesel engine 1 generates power when it is working, so that the low-temperature liquid is pumped in from the liquid 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 heats up. When the exhaust radiator 2 is working, it draws external air and heats it through the cylinder wall, so that the outside air is heated, and then the temperature of the cooling water is reduced, so that the cooling water has a better heat absorption effect, cools the diesel engine 1, and improves its working efficiency.

[0026] S2, the low-temperature liquid is heated by the hot air heat exchanger 3 and the smoke exhaust heat exchanger 4 respectively.

[0027] like Figure 1 As shown, the exhaust radiator 2 generates hot air to the right, and the hot air flows out through the deflector 5 and the hot air heat exchanger 3. The low-temperature liquid is initially heated when flowing in the first coil 6, and the low-temperature liquid after the initial heating enters the second coil 8.

[0028] When the diesel engine 1 is working, high-temperature flue gas is generated. A part of the high-temperature flue gas enters the exhaust heat exchanger 4 through the exhaust main pipe 11, and the low-temperature liquid in the second row of pipes is heated up for a second time to be gasified. 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 directly discharged through the exhaust auxiliary pipe 13 and the exhaust pipe 10.

[0029] The vaporized low-temperature liquid enters the resistance heater 18 through the exhaust main pipe 9. If the vaporization is not complete and still has a low temperature, the resistance heating plate 19 can heat and vaporize it for the third time. After complete vaporization, it is discharged from the exhaust sub-pipe 20.

[0030] S3 , measuring the gas in the exhaust pipe 9 through the temperature transmitter 15 and the pressure transmitter 16 , and feeding back the measurement results to the PLC controller 21 .

[0031] S4, the PLC controller 21 controls the resistance heater 18, the flue gas regulator 14 and the solenoid valve 17 according to the received data.

[0032] like Figure 2 As shown, the temperature transmitter 15 and the pressure transmitter 16 measure the temperature and pressure at the exhaust pipe 9 and input the measurement results to the PLC controller 21. The PLC controller 21 controls the resistance heater 18, the flue gas regulator 14 and the solenoid valve 17 based on the received measurement data and compares it with the built-in threshold value.

[0033] When the temperature detected by the temperature transmitter 15 is low, it indicates that the liquid is not completely vaporized. At this time: 1. Control the resistance heater 18 to work, so as to perform heating and gasification again; 2. Control the flue gas regulator 14 to reduce the flow rate of the high-temperature flue gas in the exhaust auxiliary pipe 13, so that more high-temperature flue gas enters the exhaust heat exchanger 4; 3. Control the solenoid valve 17 to slow down the entry speed of the cryogenic liquid.

[0034] When the temperature detected by the temperature transmitter 15 is high, the resistance heater 18 does not work; the flow rate of the high-temperature flue gas in the smoke exhaust auxiliary pipe 13 increases; and the pumping speed of the low-temperature liquid decreases.

[0035] When the pressure detected by the pressure transmitter 16 is high: 1. The resistance heater 18 does not work; 2. Increase the flow rate of high-temperature flue gas in the exhaust auxiliary pipe 13 through the flue gas regulator 14; 3. Increase the pumping speed of the cryogenic liquid through the solenoid valve 17.

[0036] When the pressure detected by the pressure transmitter 16 is relatively low, the resistance heater 18 works; the flow rate of the high-temperature flue gas in the exhaust auxiliary pipe 13 is reduced through the flue gas regulator 14; and the pumping speed of the low-temperature liquid is reduced through the solenoid valve 17.

[0037] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-temperature 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, the exhaust radiator is used to draw cold air from the outside through the cylinder of the diesel engine and generate hot air blown to the right side, the hot air heat exchanger is connected to the right side of the exhaust radiator through the air deflector, a first coil is provided in the hot air heat exchanger, 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, a second coil is provided in the smoke exhaust heat exchanger, the bottom of the second coil is connected to the top of the first coil, the top of the second coil is connected to an exhaust main pipe, the top of the smoke exhaust heat exchanger shell is fixedly connected to a smoke exhaust pipe, and the left side of the smoke exhaust heat exchanger shell is connected to the smoke outlet pipe of the diesel engine through the smoke exhaust main pipe.

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

3. The low-temperature liquid vaporization device based on engine waste heat recovery according to claim 1 is characterized in that: A smoke exhaust auxiliary pipe is connected between the smoke exhaust main pipe and the smoke exhaust pipe, a smoke regulator is fixedly connected to the smoke exhaust auxiliary pipe, and a temperature transmitter is fixedly connected to the exhaust main pipe.

4. A low-temperature liquid vaporization device and method based on engine waste heat recovery according to claim 3, characterized in that: The exhaust main pipe is fixedly connected with a pressure transmitter, and the liquid inlet pipe is fixedly connected with a solenoid valve.

5. A low-temperature 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 exhaust main pipe, staggered resistance heating plates are fixedly connected inside the resistance heater, and an exhaust sub-pipe is fixedly connected to the right side of the shell of the resistance heater.

6. A low-temperature liquid vaporization device based on engine waste heat recovery according to claim 5, characterized in that: It also includes a PLC controller, wherein the power interface of the PLC controller is electrically connected to an external power supply, the signal input end of the PLC controller is electrically connected to a temperature transmitter and a pressure transmitter, and the control output end of the PLC controller is electrically connected to a resistance heater, a flue gas regulator and a solenoid valve.

7. A cryogenic liquid vaporization method based on engine waste heat recovery, implemented based on a cryogenic liquid vaporization device based on engine waste heat recovery according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, start the diesel engine and the exhaust radiator, and pump the cryogenic liquid from the liquid inlet pipe through the diesel engine; S2, the cryogenic liquid is heated by a hot air heat exchanger and a smoke exhaust heat exchanger respectively; S3, measuring the gas in the exhaust pipe through the temperature transmitter and the pressure transmitter, and feeding back the measurement results to the PLC controller; S4, the PLC controller controls the resistance heater, the flue gas regulator and the solenoid valve according to the received data.

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