Waste oil gas recovery device

Abstract

The utility model discloses a waste oil gas recovery device which comprises a compressor, a condenser, a liquid storage tank, a first evaporator and a second evaporator, and the compressor is connected with the liquid storage tank through the condenser connected with the compressor; the air inlet end is respectively connected with a first evaporator and a second evaporator through a first air inlet valve and a second air inlet valve which are connected with the air inlet end; a first detection mechanism and a second detection mechanism are arranged on an inlet pipeline of the compressor, and a third detection mechanism and a fourth detection mechanism are arranged on a pipeline between the compressor and the condenser. The device is provided with the first evaporator and the second evaporator which can be used for condensing waste oil gas, so that the problem that continuous operation cannot be carried out is avoided, defrosting operation can be carried out respectively, and the problem that waste oil gas treatment cannot be carried out continuously is avoided; the frequency converter is adopted to control start and stop of the compressor, the compressor is started more stably, meanwhile, the working frequency of the compressor can be properly adjusted in normal work, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] This utility model relates to an oil and gas recovery device, and more particularly to a waste oil and gas recovery device. Background Technology

[0002] Waste oil and gas condensation is widely used in the petroleum, chemical, paint (coating), and transportation industries. Because light oil products such as gasoline are highly volatile during production, storage, transportation, sales, and use, they generate significant stationary oil emissions. Using condensation recovery devices can effectively reduce pollution emissions and recover and reuse energy.

[0003] In existing technologies, traditional compressors use star-delta or dual-coil start-up control, which cannot achieve energy saving and consumption reduction, and a single evaporator cannot operate continuously for a long time; moreover, the evaporator may have frosting problems, which will lead to the inability to continuously carry out condensation operations and affect work efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a waste oil and gas recovery device, which solves the problems of continuous operation and low efficiency in waste oil and gas recovery.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0006] This utility model provides a waste oil and gas recovery device, including a compressor, a condenser, a liquid storage tank, a first evaporator, and a second evaporator, wherein...

[0007] The compressor is connected to the liquid storage tank via the condenser connected thereto;

[0008] It also includes the air intake, among which,

[0009] The air inlet is connected to a first evaporator and a second evaporator via a first air inlet valve and a second air inlet valve connected thereto, respectively.

[0010] The compressor's inlet pipe has a first detection mechanism and a second detection mechanism, wherein,

[0011] The pipeline between the compressor and the condenser has a third detection mechanism and a fourth detection mechanism;

[0012] Both the first evaporator and the second evaporator are connected to the gas outlet, wherein,

[0013] The air outlet has a sixth detection mechanism.

[0014] As a preferred embodiment of this utility model, the liquid storage tank is connected to the first evaporator and the second evaporator respectively via pipelines;

[0015] A first coolant valve and a first expansion valve are provided between the liquid storage tank and the first evaporator;

[0016] A second coolant valve and a second expansion valve are provided between the liquid storage tank and the second evaporator.

[0017] As a preferred technical solution of this utility model

[0018] A first defrost valve is provided on the connecting pipe between the compressor and the first evaporator;

[0019] A second defrost valve is installed on the connecting pipe between the compressor and the second evaporator.

[0020] In a preferred embodiment of this invention, both the first evaporator and the second evaporator are connected to the compressor via a first detection mechanism and a second detection mechanism, respectively.

[0021] A seventh detection mechanism is also provided on the pipeline between the first evaporator and the second detection mechanism.

[0022] The pipeline between the second evaporator and the second detection mechanism also has a ninth detection mechanism.

[0023] As a preferred technical solution of this utility model

[0024] An eighth detection mechanism is installed on the pipeline between the first expansion valve and the first evaporator;

[0025] A tenth detection mechanism is installed on the pipeline between the second expansion valve and the second evaporator.

[0026] As a preferred embodiment of this utility model, a differential pressure transmitter is provided on the connecting pipeline between the air inlet end and the air outlet end.

[0027] As a preferred embodiment of the present invention, the first evaporator and the second evaporator respectively have a first oil outlet and a second oil outlet;

[0028] The outlet pipeline of the storage tank is also equipped with a fifth detection mechanism.

[0029] As a preferred embodiment of this utility model, the first detection mechanism, the third detection mechanism, the fifth detection mechanism, the sixth detection mechanism, the seventh detection mechanism, the eighth detection mechanism, the ninth detection mechanism, and the tenth detection mechanism all include temperature detection equipment;

[0030] Both the second and fourth testing institutions include pressure testing equipment.

[0031] The beneficial effects of this utility model are as follows: This utility model has a first evaporator and a second evaporator, both of which can perform waste oil and gas condensation operations, avoiding the problem of not being able to operate continuously. They can perform defrosting operations separately, ensuring continuous waste oil and gas treatment. A frequency converter is used to control the compressor's start and stop, making its start-up smoother. At the same time, the compressor's operating frequency can be appropriately adjusted during normal operation to achieve energy saving and consumption reduction. Optionally, the compressor is also protected by equipping its inlet and outlet with temperature and pressure sensors to detect the inlet and outlet air temperature and pressure. When the system detects abnormal temperature or pressure during operation, it will alarm and stop the compressor to avoid property damage caused by compressor failure. Optionally, both evaporators use electronic expansion valves, which can adjust the compressor frequency and evaporator coolant flow rate by detecting the oil and gas temperature at the common outlet of the two evaporators. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] In the diagram: 1. Compressor; 11. First detection mechanism; 12. Second detection mechanism; 13. Third detection mechanism; 14. Fourth detection mechanism; 2. Condenser; 3. Liquid receiver; 31. Fifth detection mechanism; 4. Inlet end; 5. Outlet end; 51. Sixth detection mechanism; 6. First evaporator; 61. First inlet valve; 62. First oil outlet; 63. First coolant valve; 64. First expansion valve; 65. First defrost valve; 66. Seventh detection mechanism; 67. Eighth detection mechanism; 7. Second evaporator; 71. Second inlet valve; 72. Second oil outlet; 73. Second coolant valve; 74. Second expansion valve; 75. Second defrost valve; 76. Ninth detection mechanism; 77. Tenth detection mechanism; 8. Differential pressure transmitter. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] Example

[0036] like Figure 1 As shown, this embodiment provides a waste oil and gas recovery device, including a compressor 1, a condenser 2, a liquid storage tank 3, a first evaporator 6, and a second evaporator 7. The compressor 1 is connected to the liquid storage tank 3 through the condenser 2. Preferably, in this embodiment, the compressor is controlled to start and stop by a frequency converter, which can achieve smooth start-up and reduce the impact of high-power compressors on the power grid. After the compressor stops, a delay time is set, and the compressor can be restarted after the time expires, avoiding frequent starts that could damage the compressor.

[0037] In this embodiment, the first detection mechanism 11, the third detection mechanism 13, the fifth detection mechanism 31, the sixth detection mechanism 51, the seventh detection mechanism 66, the eighth detection mechanism 67, the ninth detection mechanism 76 and the tenth detection mechanism 77 all include temperature detection equipment; the second detection mechanism 12 and the fourth detection mechanism 14 both include pressure detection equipment.

[0038] The recovery device also includes an air inlet 4, wherein the air inlet 4 is connected to a first evaporator 6 and a second evaporator 7 via at least one first air inlet valve 61 and at least one second air inlet valve 71 connected thereto. Both the first evaporator 6 and the second evaporator 7 can perform condensation of waste oil and gas. In this embodiment, each of the first air inlet valve 61 and the second air inlet valve 71 is provided as one. Preferably, multiple first air inlet valves 61 and multiple second air inlet valves 71 can be provided. Correspondingly, multiple evaporators can also be provided, including various detection mechanisms and expansion valves, defrosting valves, etc.

[0039] The liquid storage tank 3 is connected to the first evaporator 6 and the second evaporator 7 via pipelines. Specifically, a first coolant valve 63 and a first expansion valve 64 are provided between the liquid storage tank 3 and the first evaporator 6; a second coolant valve 73 and a second expansion valve 74 are provided between the liquid storage tank 3 and the second evaporator 7. The coolant gas can enter the first evaporator 6 and the second evaporator 7 respectively through the first expansion valve 64 and the second expansion valve 74 for condensation treatment of waste oil gas. The first evaporator 6 and the second evaporator 7 have a first oil outlet 62 and a second oil outlet 72 respectively to realize the recovery of condensed oil.

[0040] The compressor 1 has a first detection mechanism 11 and a second detection mechanism 12 on its inlet pipe. The pipe between the compressor 1 and the condenser 2 has a third detection mechanism 13 and a fourth detection mechanism 14. Specifically, the first evaporator 6 and the second evaporator 7 are both connected to the compressor 1 through the first detection mechanism 11 and the second detection mechanism 12. The first detection mechanism 11 and the second detection mechanism 12 can detect the inlet temperature and pressure of the compressor 1. When the temperature is too low, an alarm can be triggered and the compressor 1 can be stopped. In this embodiment, the control of each detection mechanism is implemented by a control device, but it can also be manually controlled.

[0041] A seventh detection mechanism 66 is also provided on the pipeline between the first evaporator 6 and the second detection mechanism 12, and a ninth detection mechanism 76 is also provided on the pipeline between the second evaporator 7 and the second detection mechanism 12. When the coolant that has completed the heat absorption and condensation operation in the first evaporator 6 or the second evaporator 7 re-enters the compressor 1, the seventh detection mechanism 66 and the ninth detection mechanism 76 can detect its temperature and display the temperature.

[0042] An eighth detection mechanism 67 is provided on the pipeline between the first expansion valve 64 and the first evaporator 6, and a tenth detection mechanism 77 is provided on the pipeline between the second expansion valve 74 and the second evaporator 7. When the first expansion valve 64 and the second expansion valve 74 release coolant gas into the first evaporator 6 and the second evaporator 7, the eighth detection mechanism 67 and the tenth detection mechanism 77 can detect and display the temperature.

[0043] The first evaporator 6 and the second evaporator 7 are both connected to the gas outlet 5. The gas outlet 5 has a sixth detection mechanism 51, which can adjust the compressor frequency and the evaporator coolant flow rate by detecting the oil and gas temperature at the common outlet of the two evaporators (sixth detection mechanism 51).

[0044] A first defrost valve 65 is installed on the connecting pipe between compressor 1 and the first evaporator 6, and a second defrost valve 75 is installed on the connecting pipe between compressor 1 and the second evaporator 7. Both valves can deliver compressed gas from compressor 1 to the first evaporator 6 or the second evaporator 7 for defrosting. Since there are two evaporators, one can be defrosted while the other continues to condense waste oil gas.

[0045] Preferably, a differential pressure transmitter 8 is installed on the connecting pipeline between the inlet end 4 and the outlet end 5. During normal operation of the unit, the operating time of the first evaporator 6 is timed, and the differential pressure transmitter 8 at the inlet and outlet of the evaporator detects the pressure difference of the gas. When the operating time reaches the set value or the differential pressure is too large, the second coolant valve 73, the second expansion valve 74, and the second inlet valve 71 of the second evaporator 7 are opened, and both evaporators start condensing simultaneously. After the two evaporators have been condensing simultaneously for a certain period of time, the first coolant valve 63, the first expansion valve 64, and the first inlet valve 61 of the first evaporator 6 can be closed to stop the condensing operation; then the first defrost valve 65 is opened to start the defrosting operation.

[0046] The outlet pipe of the liquid storage tank 3 is also equipped with a fifth detection mechanism 31, which is used to detect the temperature of the cooling gas output from the liquid storage tank 3.

[0047] Specifically, a typical implementation process includes: the frequency converter controls the compressor 1 to start smoothly, thereby reducing the impact of the high-power compressor on the power grid; after the compressor 1 stops, a delay time is set, and the compressor can be restarted after the time expires, avoiding frequent starts that could damage the compressor.

[0048] After compressor 1 starts, the temperature and pressure at the inlet and outlet of compressor 1 are detected after a delay (achieved by the first detection mechanism 11, the second detection mechanism 12, the third detection mechanism 13, and the fourth detection mechanism 14). An alarm is triggered and compressor 1 stops when the inlet temperature TT1A and pressure PT1A are too low; an alarm is triggered and compressor 1 stops when the outlet temperature TT1B and pressure PT1B are too high. Before compressor startup, the first coolant valve 63, the first expansion valve 64, the second coolant valve 73, and the second expansion valve 74 are opened in advance to prevent pipe blockage and excessively high outlet temperature and pressure of compressor 1. After the coolant valves are opened and the compressor starts, both evaporators are pre-cooled simultaneously. After the set pre-cooling time, the first coolant valve 63 and the first expansion valve 64 of the first evaporator 6 are kept open, while the first intake valve 61 is opened. The second coolant valve 73 and the second expansion valve 74 of the second evaporator 7 are closed, putting the first evaporator 6 into condensation operation, while the second evaporator 7 remains in a waiting state.

[0049] Preferably, the compressor 1 frequency level can be set, such as the lowest level not lower than 30Hz. During normal operation of the unit, the compressor 1 frequency level is adjusted according to the temperature of the evaporator oil and gas outlet (detected by the sixth detection agency 51). At the same time, PID regulation is used to control the opening of the first expansion valve 64 of the coolant, further precisely controlling the coolant flow and better controlling the temperature.

[0050] When the unit is operating normally, the operating time of the first evaporator 6 is timed, and the differential pressure transmitter 8 at the inlet and outlet of the evaporator detects the pressure difference of the gas. When the operating time reaches the set value or the differential pressure is too large, the second coolant valve 73, the second expansion valve 74, and the second air inlet valve 71 of the second evaporator 7 are opened, and both evaporators start condensing at the same time.

[0051] After the two evaporators have been condensing simultaneously for a certain period of time (a specific time can be set), the first coolant valve 63, the first expansion valve 64, and the first air inlet valve 61 of the first evaporator 6 are closed to stop the condensation operation.

[0052] After the first evaporator 6 stops condensing, the first defrost valve 65 is opened, and the high-temperature gas from the compressor 1 outlet is used to defrost the first evaporator. Defrosting can be performed intermittently over a cycle, meaning it operates for a period within a cycle, then stops, and resumes in the next cycle. This mode ensures a sufficient supply of coolant to the second evaporator 7 and prevents the condensing efficiency of the second evaporator 7 from being reduced while the first evaporator 6 is defrosting.

[0053] The two evaporators switch between each other based on a set time and the differential pressure between the oil and gas inlet and outlet, ensuring continuous and uninterrupted operation of the compressor unit. The condensed liquid oil is recovered from the evaporator outlet to the oil storage tank.

[0054] This utility model features a first evaporator 6 and a second evaporator 7, both capable of condensing waste oil and gas, thus avoiding the problem of continuous operation interruption. They can also perform defrosting operations separately, ensuring uninterrupted waste oil and gas treatment. A frequency converter controls the start and stop of the compressor 1, making its start-up smoother. During normal operation, the compressor's operating frequency can be adjusted appropriately to achieve energy saving and consumption reduction. Optionally, protection is also provided for the compressor 1, with temperature and pressure sensors (first detection mechanism 11, second detection mechanism 12, third detection mechanism 13, and fourth detection mechanism 14) installed at its inlet and outlet to detect the inlet and outlet air temperature and pressure. During operation, the system detects... When abnormal temperature or pressure occurs, an alarm will sound and compressor 1 will stop operating to prevent property damage caused by compressor failure. Optionally, both evaporators are equipped with electronic expansion valves (first expansion valve 64 and second expansion valve 74), which can adjust the compressor frequency and evaporator coolant flow rate by detecting the oil-gas temperature at the common outlet of the two evaporators (sixth detection mechanism 51). Optionally, the coolant temperature at the evaporator inlet and outlet is displayed using temperature sensors (achieved through the seventh detection mechanism 66, eighth detection mechanism 67, ninth detection mechanism 76, and tenth detection mechanism 77). During operation, the evaporators can be switched using time or differential pressure control. This configuration offers significant advantages in energy consumption and allows for uninterrupted equipment operation, greatly improving production efficiency.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A waste oil gas recovery apparatus characterized by comprising: Comprising a compressor (1), a condenser (2), a liquid storage tank (3), a first evaporator (6) and a second evaporator (7), wherein, The compressor (1) is connected with the condenser (2) connected thereto, and the liquid storage tank (3) is connected thereto; Further comprising an air inlet end (4), wherein, The air inlet end (4) is connected with the first evaporator (6) and the second evaporator (7) through at least one first air inlet valve (61) and at least one second air inlet valve (71) connected thereto, respectively; The compressor (1) has a first detection mechanism (11) and a second detection mechanism (12) on the inlet pipeline thereof, The compressor (1) has a third detection mechanism (13) and a fourth detection mechanism (14) on the pipeline between the compressor (1) and the condenser (2); The first evaporator (6) and the second evaporator (7) are both connected to an air outlet end (5), wherein, The air outlet end (5) has a sixth detection mechanism (51).

2. The waste oil vapor recovery device of claim 1, wherein The liquid storage tank (3) is connected to the first evaporator (6) and the second evaporator (7) through a pipeline, respectively; The liquid storage tank (3) is provided with a first coolant valve (63) and a first expansion valve (64) between the liquid storage tank (3) and the first evaporator (6); The liquid storage tank (3) is provided with a second coolant valve (73) and a second expansion valve (74) between the liquid storage tank (3) and the second evaporator (7).

3. The waste oil gas recovery device according to claim 1 or 2, characterized in that, The first defrosting valve (65) is arranged on the connecting pipeline between the compressor (1) and the first evaporator (6); The second defrosting valve (75) is arranged on the connecting pipeline between the compressor (1) and the second evaporator (7).

4. The apparatus of claim 3, wherein: The first evaporator (6) and the second evaporator (7) are both connected with the compressor (1) through the first detection mechanism (11) and the second detection mechanism (12), wherein, The first evaporator (6) and the second evaporator (7) are both connected with the compressor (1) through the first detection mechanism (11) and the second detection mechanism (12), wherein, The second evaporator (7) and the second detection mechanism (12) are both connected with the compressor (1) through the first detection mechanism (11) and the second detection mechanism (12), wherein, 5. The waste oil gas recovery device according to claim 2, characterized in that, The eighth detection mechanism (67) is arranged on the pipeline between the first expansion valve (64) and the first evaporator (6); The tenth detection mechanism (77) is arranged on the pipeline between the second expansion valve (74) and the second evaporator (7).

6. The apparatus of claim 4 wherein, The differential pressure transmitter (8) is arranged on the connecting pipeline between the air inlet end (4) and the air outlet end (5).

7. A waste oil vapor recovery device as set forth in claim 5 wherein, The first evaporator (6) and the second evaporator (7) respectively have a first oil outlet (62) and a second oil outlet (72); The fifth detection mechanism (31) is further arranged on the outlet pipeline of the liquid storage tank (3).

8. A waste oil vapor recovery device as set forth in claim 7 wherein, The first detection mechanism (11), the third detection mechanism (13), the fifth detection mechanism (31), the sixth detection mechanism (51), the seventh detection mechanism (66), the eighth detection mechanism (67), the ninth detection mechanism (76) and the tenth detection mechanism (77) all comprise temperature detection devices; The second detection mechanism (12) and the fourth detection mechanism (14) both comprise pressure detection devices.

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