A processing system and method for a fraction gas

Abstract

The present invention discloses a processing system for fraction gas, comprising: a fraction gas inlet pipeline and a heat exchange device, wherein the heat exchange device includes: a pressure detection module, a first valve control module, a first controller and more than 2 heat exchangers; each heat exchanger includes a fraction gas heat exchange pipeline, and the fraction gas heat exchange pipeline is provided with a fraction gas inlet, a condensate liquid outlet and a fraction gas outlet; all fraction gas inlets are connected to the fraction gas inlet pipeline, and the first valve control module is configured to control the on-off state between all fraction gas inlets and the fraction gas inlet pipeline, and the first controller is communicatively connected to the pressure detection module and all first valve control modules. The present invention also provides a processing method for fraction gas. According to the fraction gas processing system and processing method of the present invention, when one heat exchanger fails, it can be switched to another heat exchanger through the first controller, and online cleaning without shutdown can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fraction gas treatment, and particularly to a treatment system and a treatment method for fraction gas. Background Art

[0002] When a thermal desorption device processes materials such as industrial waste clay, oily sludge, and municipal sludge, oil gas and dust will be generated during the treatment of the materials through the thermal desorption process. This part of the fraction gas needs to be condensed to extract the oil phase to achieve the resource utilization of oil-containing waste. It has received more and more attention and industry recognition in the field of oil-containing waste treatment and has become the most promising oil-containing waste treatment technology at present.

[0003] The current industry difficulty is that in addition to oil gas in the fraction gas, there are also water vapor and dust, and a dust, water, and oil mixture will be generated after condensation, which is difficult to separate.

[0004] In the industry, the fraction gas is usually treated by the method of post-condensation. The condensation methods include two categories: direct condensation and indirect condensation. Among them, indirect condensation usually uses a heat exchanger condensation device. Heavy oil with a relatively high viscosity is likely to cause blockage of the heat exchanger and requires frequent shutdown for cleaning, resulting in a low condensation efficiency of the fraction gas and seriously delaying the subsequent treatment efficiency. Summary of the Invention

[0005] The present invention discloses a treatment system and a treatment method for fraction gas to solve the technical problem in the prior art that heavy oil with a relatively high viscosity is likely to cause blockage of the heat exchanger and requires frequent cleaning, resulting in a low condensation efficiency of the fraction gas.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a processing system for fraction gas, comprising: a fraction gas inlet pipeline and a heat exchange device, the heat exchange device including: a pressure detection module, a first valve control module, a first controller, and more than 2 heat exchangers; wherein each of the heat exchangers includes a fraction gas heat exchange pipeline, and the fraction gas heat exchange pipeline is provided with a fraction gas inlet, a condensate liquid outlet, and a fraction gas outlet; all the fraction gas inlets are connected to the fraction gas inlet pipeline, the first valve control module is configured to control the on-off state between all the fraction gas inlets and the fraction gas inlet pipeline, and the first controller is communicatively connected to the pressure detection module and all the first valve control modules; the pressure detection module is configured to detect the pressure of the fraction gas inside the fraction gas heat exchange pipeline currently in the working state and feed the pressure value back to the first controller; the first controller is configured to, in response to the pressure value detected by the pressure detection module being higher than the set value, control the first valve control module to disconnect the connection state between the fraction gas heat exchange pipeline currently in the working state and the fraction gas inlet pipeline and make another fraction gas heat exchange pipeline in the non-working state be in a connected state with the fraction gas inlet pipeline.

[0008] Optionally, the pressure detection module includes a pressure gauge, and the pressure gauge is arranged on the fraction gas inlet pipeline; or the pressure detection module includes multiple pressure gauges, the number of the pressure gauges is the same as the number of the heat exchangers, and one pressure gauge is arranged at the fraction gas inlet of each heat exchanger.

[0009] Optionally, the heat exchange device further includes a gas displacement module; the gas displacement module is configured to displace the fraction gas in the fraction gas heat exchange pipeline.

[0010] Optionally, the gas displacement module includes a displacement gas storage tank, and the displacement gas storage tank is connected to all the fraction gas heat exchange pipelines through pipelines; or the gas displacement module includes multiple displacement gas storage tanks, the number of the displacement gas storage tanks is the same as the number of the heat exchangers, and each displacement gas storage tank is connected to the corresponding fraction gas heat exchange pipeline through a pipeline; the displacement gas storage tank is a nitrogen gas storage tank.

[0011] Optionally, each heat exchanger further includes a detection port and a gas alarm; the detection port is arranged at the lower part of the heat exchanger and is connected to the fraction gas heat exchange pipeline in the heat exchanger through a pipeline, and the detection port is connected to the gas alarm through a pipeline; the gas alarm is configured to detect the concentration of harmful gas at the detection port and issue an alarm when the concentration is greater than a specific value.

[0012] Optionally, each of the heat exchangers further includes a cleaning port, which is provided at the top of the heat exchanger and is in communication with the fraction gas heat exchange pipeline in the heat exchanger.

[0013] Optionally, the fraction gas treatment system further includes a sedimentation and oil collection device, which includes a sedimentation tank, an oil tank, and a partition provided between the sedimentation tank and the oil tank; the sedimentation tank is provided below the condensate liquid outlet; the height of the top of the partition is lower than the height of the top surface of the sedimentation tank and the height of the top surface of the oil tank so that the oil phase in the sedimentation tank can flow over the partition into the oil tank.

[0014] Optionally, the heat exchange device further includes a backwashing manifold, and each of the fraction gas heat exchange pipelines further includes a backwashing port. One end of the backwashing manifold is connected to the bottom of the sedimentation tank, and the other end of the backwashing manifold is connected to the backwashing port of the heat exchanger.

[0015] Optionally, a first interface meter, a sewage discharge port, and a second controller communicatively connected to the first interface meter and the sewage discharge port are provided in the sedimentation tank; the first interface meter is configured to display the liquid level height of the aqueous phase in the sedimentation tank.

[0016] Optionally, the oil tank is provided with a second interface meter, an oil pumping port, a heavy sedimentation assembly, and a third controller communicatively connected to the second interface meter, the oil pumping port, and the heavy sedimentation assembly; the second interface meter is configured to display the liquid level height of the aqueous phase and the liquid level height of the oil phase in the oil tank; the heavy sedimentation assembly is provided at the bottom of the oil tank and is connected to the sedimentation tank through a pipeline.

[0017] Optionally, the heavy sedimentation assembly includes a positive displacement pump or a diaphragm pump.

[0018] Optionally, each of the heat exchangers further includes a dust removal assembly, which includes a dust remover. The dust remover includes a dust-containing fraction gas inlet, a fraction gas outlet after dust removal, and a dust-containing liquid droplet outlet that are connected through a pipeline to the fraction gas outlet; the dust-containing liquid droplet outlet is connected to the sedimentation tank through a pipeline; the heat exchange device further includes a second valve control module, which is provided at the fraction gas outlet of each heat exchanger; the second valve control module is configured to control the on-off state between all the fraction gas outlets and the fraction gas heat exchange pipelines, and the first controller is communicatively connected to all the second valve control modules.

[0019] Optionally, the fraction gas treatment system further includes a sludge removal device, which includes a scraper frame and a scraper conveyor obliquely installed on the scraper frame; the scraper conveyor includes a feeding end and a discharging end; the sedimentation tank and the oil tank are arranged inside the scraper frame, and the feeding end of the scraper conveyor extends to the bottom of the sedimentation tank; the sludge removal device further includes a sludge discharge port, which is located below the discharging end.

[0020] According to the second aspect of the present invention, there is provided a method for treating fraction gas, including: obtaining and feeding back the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state; and when the pressure value is higher than the set value, disconnecting the connection state between the fraction gas heat exchange pipeline currently in the working state and the fraction gas inlet pipeline, and making another fraction gas heat exchange pipeline in the non-working state communicate with the fraction gas inlet pipeline.

[0021] Optionally, the step of obtaining and feeding back the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state includes: obtaining the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state by detecting the pressure of the fraction gas inside the fraction gas inlet pipeline; or detecting the pressure inside the fraction gas heat exchange pipeline currently in the working state to obtain the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state.

[0022] Optionally, after the step of disconnecting the connection state between the fraction gas heat exchange pipeline currently in the working state and the fraction gas inlet pipeline, it further includes: cleaning the fraction gas heat exchange pipeline after disconnecting it from the fraction gas inlet pipeline, and the cleaning method includes: introducing a replacement gas into the fraction gas heat exchange pipeline to continuously replace the fraction gas in the fraction gas heat exchange pipeline within a predetermined time; after the predetermined time ends, obtaining the concentration of harmful gases inside the fraction gas heat exchange pipeline; when the concentration of the harmful gases is greater than a specific value, issuing an alarm and repeating the step of introducing a replacement gas into the fraction gas heat exchange pipeline to continuously replace the fraction gas in the fraction gas heat exchange pipeline within a predetermined time; and when there is no alarm, cleaning the fraction gas heat exchange pipeline.

[0023] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0024] According to the fraction gas treatment system and the fraction gas treatment method provided by the present invention, when a heat exchanger fails, the program control switches to another heat exchanger, enabling online cleaning without stopping the machine, effectively improving the subsequent treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is the front view of the processing system for fraction gas according to the present invention;

[0027] Figure 2 is the side view of the processing system for fraction gas according to the present invention;

[0028] Figure 3 is the structural schematic diagram of the dust collector in the processing system for fraction gas according to the present invention.

[0029] Description of reference numerals:

[0030] 10 First heat exchanger

[0031] 11 Second heat exchanger

[0032] 12 First pressure gauge

[0033] 13 Second pressure gauge

[0034] 101 First fraction gas inlet

[0035] 102 First condensate liquid outlet

[0036] 103 First fraction gas outlet

[0037] 111 Second fraction gas inlet

[0038] 112 Second condensate liquid outlet

[0039] 113 Second fraction gas outlet

[0040] 104A First valve control component A

[0041] 104B First valve control component B

[0042] 105A Second valve control component A

[0043] 105B Second valve control component B

[0044] 106A Third valve control component A

[0045] 106B Third valve control component B

[0046] 14 Nitrogen gas storage tank

[0047] 15 Detection port

[0048] 16 Cooling water exhaust port

[0049] 17 Backwashing Manifold

[0050] 20 Settling Tank

[0051] 21 Fuel Tank

[0052] 22 Baffle

[0053] 201 First Interface Gauge

[0054] 202 First Drainage Port

[0055] 203 Second Drainage Port

[0056] 211 Second Interface Gauge

[0057] 212 Oil Pumping Port

[0058] 214 Heavy Settling Assembly

[0059] 30 Dust Collector

[0060] 301 Inlet for Dust-Laden Fraction Gas

[0061] 302 Outlet for Fraction Gas after Dust Removal

[0062] 303 Outlet for Dust-Laden Liquid Droplets

[0063] 40 Scraper Conveyor

[0064] 41 Scraper Conveyor Frame

[0065] 42 Mud Discharge Port

[0066] 43 Water Make-up Port Detailed Embodiments

[0067] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0068] The following will, with reference to the drawings, elaborate on the technical solutions disclosed in various embodiments of the present invention.

[0069] According to an embodiment of the present invention, a processing system for fraction gas is provided, including: a fraction gas inlet pipeline and a heat exchange device. The heat exchange device includes: a pressure detection module, a first valve control module, a first controller, and a heat exchanger. Among them, in the embodiments of the present application, the number of heat exchangers can usually be two or more, and the pressure detection module usually can include one or more pressure gauges. The following will be combined withFigure 1 , the description will be given by taking the heat exchange device having two heat exchangers and the pressure detection module including two pressure gauges as an example.

[0070] As Figure 1 shown, the heat exchange device includes two heat exchangers, the first heat exchanger 10 and the second heat exchanger 11. The fraction gas heat exchange pipeline of the first heat exchanger 10 is provided with a first fraction gas inlet 101, a first condensed liquid outlet 102 and a first fraction gas outlet 103; the fraction gas heat exchange pipeline of the second heat exchanger 11 is provided with a second fraction gas inlet 111, a second condensed liquid outlet 112 and a second fraction gas outlet 113; both the first fraction gas inlet 101 and the second fraction gas inlet 111 are connected to the fraction gas inlet pipeline; the first valve control module includes a first valve control component A 104A and a first valve control component B 104B. The first valve control component A 104A is arranged at the fraction gas inlet of the first heat exchanger 10, and the first valve control component B 104B is arranged at the fraction gas inlet of the second heat exchanger 11. The first valve control component A 104A arranged on the first heat exchanger 10 is configured to control the on-off state between the first fraction gas inlet 101 and the fraction gas inlet pipeline; the first valve control component B 104B arranged on the second heat exchanger 11 is configured to control the on-off state between the second fraction gas inlet 111 and the fraction gas inlet pipeline.

[0071] In the use state of the processing system in this embodiment, the fraction gas heat exchange pipeline in one of the heat exchangers will be connected to the fraction gas inlet pipeline to make it in the working state, and the fraction gas heat exchange pipelines in the remaining heat exchangers will be disconnected from the fraction gas inlet pipeline to make these heat exchangers all in the non-working state, that is, the standby state. For example, first open the first valve control component A 104A. At this time, the fraction gas heat exchange pipeline of the first heat exchanger 10 will be connected to the fraction gas inlet pipeline and be in the working state, and close the first valve control component B 104B to disconnect the fraction gas heat exchange pipeline of the second heat exchanger 11 from the fraction gas inlet pipeline to make it in the non-working state. Of course, vice versa is also possible. The first pressure gauge 12 is arranged at the first fraction gas inlet 101 of the first heat exchanger 10; the second pressure gauge 13 is arranged at the second fraction gas inlet 111 of the second heat exchanger 11; the first controller is communicatively connected to the first pressure gauge 12, the second pressure gauge 13, the first valve control component A 104A of the first heat exchanger 10 and the first valve control component B 104B of the second heat exchanger 11; the first pressure gauge 12 and the second pressure gauge 13 are configured to detect the pressure of the fraction gas inside the fraction gas heat exchange pipeline in the current working state and feed back the pressure value to the first controller.

[0072] During the use of the first heat exchanger 10 and the second heat exchanger 11, the condensed water in the shell side of the first heat exchanger 10 and the second heat exchanger 11 continuously condenses the distillate gas in the distillate gas heat exchange pipeline, and the pipe wall of the distillate gas heat exchange pipeline will continuously adhere to oil droplets and other dust particles. When the continuously adhered oil droplets and other dust particles accumulate to a certain extent, the distillate gas heat exchange pipeline will be blocked, thereby causing the internal pressure of the distillate gas heat exchange pipeline to increase. In this embodiment, the distillate gas heat exchange pipeline of the first heat exchanger 10 is detected by the first pressure gauge 12. The pressure of the distillate gas inside the gas heat exchange pipeline or the pressure of the distillate gas inside the distillate gas heat exchange pipeline of the second heat exchanger 11 is detected by the second pressure gauge 13 to obtain the pressure of the distillate gas inside the distillate gas heat exchange pipeline of the first heat exchanger 10 or the second heat exchanger 11. Of course, in another embodiment, the number of pressure gauges can be one, and the pressure gauge is set on the distillate gas inlet pipeline. The pressure of the distillate gas inside the distillate gas heat exchange pipeline can also be obtained by detecting the pressure of the distillate gas inside the distillate gas inlet pipeline. When the value of the pressure gauge is higher than the set value, an alarm is issued, thereby determining whether the first heat exchanger 10 or the second heat exchanger 11 currently in the working state is blocked, and then determining whether the first heat exchanger 10 and the second heat exchanger 11 need to be cleaned. When the obtained pressure value is higher than the set value, the pressure value is fed back to the first controller, and then the first controller controls the first valve control module to disconnect the blocked distillate gas heat exchange pipeline and the distillate gas inlet pipeline and connect the other unblocked distillate gas heat exchange pipeline with the distillate gas inlet pipeline.

[0073] In this embodiment, by providing a first heat exchanger 10, a second heat exchanger 11, a first valve control component A 104A, a first valve control component B 104B and a first controller, when one heat exchanger is blocked, for example, when the first heat exchanger 10 is blocked, the first controller is switched to the second heat exchanger 11, so that online cleaning can be achieved without stopping the machine, thereby effectively improving the efficiency of subsequent processing.

[0074] It can be understood that when the present embodiment includes more heat exchangers, more spare heat exchangers can be provided for replacement when a blockage occurs, thereby allowing more time for cleaning work.

[0075] In order to improve the safety when cleaning the failed heat exchanger, the heat exchange device may further include a nitrogen gas storage tank 14 for replacing the distillate gas in the distillate gas heat exchange pipeline. The number of nitrogen gas storage tanks 14 may generally be one or more, such as Figure 1 As shown, in this embodiment, the first heat exchanger 10 and the second heat exchanger 11 are each provided with a nitrogen gas storage tank 14 connected to the fraction gas heat exchange pipeline of the first heat exchanger 10 and the second heat exchanger 11 .

[0076] In this embodiment, the first heat exchanger 10 and the second heat exchanger 11 may each further include a detection port 15 and a gas alarm (not shown in the figure); the detection port 15 is provided at the lower part of the first heat exchanger 10 and the second heat exchanger 11 and is connected to the fraction gas heat exchange pipeline in the first heat exchanger 10 and the second heat exchanger 11 through a pipeline, and the detection port 15 is connected to the gas alarm through a pipeline; the gas alarm can detect the concentration of CO and / or H 2 S at the detection port and issue an alarm when the concentration is greater than a specific value.

[0077] In this embodiment, the first heat exchanger 10 and the second heat exchanger 11 may each further include a cleaning port, and the cleaning ports are respectively provided at the tops of the first heat exchanger 10 and the second heat exchanger 11 and are respectively connected to the fraction gas heat exchange pipelines in the first heat exchanger 10 and the second heat exchanger 11. The shell sides of the first heat exchanger 10 and the second heat exchanger 11 are filled with coolant to indirectly condense the fraction gas. The coolant pipeline is provided with a cooling water exhaust port 16.

[0078] When one of the first heat exchanger 10 and the second heat exchanger 11 is blocked and needs to be repaired, the gas in the blocked heat exchanger can be replaced by using the gas in the nitrogen gas storage tank 14, and at the same time, a gas alarm is used to detect the concentration of CO and / or H 2 S at the detection port 15, so as to avoid potential safety hazards caused by CO and / or H 2 S during the process of opening the cover and cleaning the blocked heat exchanger, and maximize the safety of maintenance personnel.

[0079] In this embodiment, in order to improve the separation efficiency of the oil phase and the water phase in the condensed liquid obtained after condensation by the first heat exchanger 10 and the second heat exchanger 11, the fraction gas treatment system may further include a sedimentation and oil collection device, such as Figure 2 shown, the sedimentation and oil collection device includes a sedimentation tank 20, an oil tank 21 and a partition plate 22 arranged between the sedimentation tank and the oil tank; the sedimentation tank 20 is arranged below the condensed liquid outlet, for example, below the first condensed liquid outlet 102 and the second condensed liquid outlet 112; the height of the top of the partition plate 22 is lower than the height of the top surface of the sedimentation tank 20 and the height of the top surface of the oil tank 21 so that the oil phase in the sedimentation tank 20 can flow over the partition plate 22 and into the oil tank 21.

[0080] Among them, when the fraction gas treatment system is operating, the bottoms of the first condensed liquid outlet 102 and the second condensed liquid outlet 112 are located below the liquid level of the sedimentation tank 20, so as to play a water seal role on the first condensed liquid outlet 102 and the second condensed liquid outlet 112 through the liquid surface and prevent gas leakage in the fraction gas heat exchange pipeline.

[0081] Further, in this embodiment, the heat exchange device may further include a backwashing manifold 17. A backwashing manifold 17 is provided on each of the first heat exchanger 10 and the second heat exchanger 11. The fraction gas heat exchange pipelines of the first heat exchanger 10 and the second heat exchanger 11 are respectively provided with backwashing ports. One end of the backwashing manifold 17 is connected to the bottom of the sedimentation tank 20, and the other end of the backwashing manifold 17 is connected to the backwashing ports of the first heat exchanger 10 and the second heat exchanger 11. Thus, the on-line flushing time of the backwashing manifold 17 is set according to the on-site working conditions and the time interval of material blockage. The flushing time can be irregular or regular flushing. For example, the on-line backwashing can be started every 30 minutes for 30 seconds to clean the inside of the fraction gas heat exchange pipeline regularly.

[0082] Specifically, a first interface meter 201, a first sewage discharge port 202 and a second controller communicatively connected to the first interface meter 201 and the first sewage discharge port 202 are provided in the sedimentation tank 20. The first interface meter 201 is configured to display the liquid level height of the aqueous phase in the sedimentation tank 20. The second controller is configured to open the first sewage discharge port 202 when the liquid level height of the aqueous phase displayed by the first interface meter 201 reaches a first predetermined value and close the first sewage discharge port 202 when the liquid level height of the aqueous phase displayed by the first interface meter 201 drops to a second predetermined value. That is, when the liquid level height of the aqueous phase in the sedimentation tank 20 reaches a certain value, the second controller controls the first sewage discharge port 202 to automatically discharge externally. When the liquid level height of the aqueous phase measured by the first interface meter 201 in the sedimentation tank 20 drops to a certain value, the second controller controls the first sewage discharge port 202 to stop discharging externally. A water replenishing port 43 is provided in the upper part of the sedimentation tank 20 for water replenishment during the initial startup.

[0083] Among them, the fuel tank 21 is provided with a second interface gauge 211, an oil pumping port 212, a heavy sedimentation component 214, a second sewage discharge port 203, and a third controller communicatively connected to the second interface gauge 211, the oil pumping port 212, the heavy sedimentation component 214, and the second sewage discharge port 203; the second interface gauge 211 is configured to display the liquid level height of the water phase and the liquid level height of the oil phase in the fuel tank 21; the heavy sedimentation component 214 is arranged at the bottom of the fuel tank 21 and is communicated with the sedimentation tank 20 through a pipeline. The third controller is configured to start the heavy sedimentation component 214 when the liquid level height of the water phase displayed by the second interface gauge 211 reaches a third predetermined value, close the heavy sedimentation component 214 when the liquid level height of the water phase displayed by the second interface gauge 211 drops to a fourth predetermined value, and open the oil pumping port 212 when the liquid level height of the oil phase displayed by the second interface gauge 211 reaches a fifth predetermined value. That is, when the liquid level height of the water phase in the fuel tank 21 measured by the second interface gauge 211 reaches a certain value, the third controller controls the heavy sedimentation component 214 to start, and pumps the water phase and the sludge at the bottom of the water phase in the fuel tank 21 back to the sedimentation tank 20. When the liquid level height of the water phase in the fuel tank 21 measured by the second interface gauge 211 drops to a certain value, the third controller controls the heavy sedimentation component 214 to stop discharging. When the liquid level height of the oil phase in the fuel tank 21 measured by the second interface gauge 211 reaches a certain value, oil is pumped through the oil pumping port 212. In this embodiment, the heavy sedimentation component 214 can also adopt a positive displacement pump. Of course, in other embodiments, a diaphragm pump can also be adopted. When the processing system stops abnormally, due to the cold in winter, the fuel tank needs to be quickly cleaned. Long-term shutdown will cause icing, and at this time, the second sewage discharge port 203 will be opened simultaneously to accelerate the discharging speed.

[0084] Further, as Figure 3As shown, the first heat exchanger 10 and the second heat exchanger 11 each further include a dust remover 30. The dust remover 30 includes a dust-containing fraction gas inlet 301, a fraction gas outlet 302 after dust removal, and a dust-containing liquid droplet outlet 303. Among them, the dust-containing fraction gas inlet 301 is connected to the fraction gas outlet 103 of the first heat exchanger 10 and the fraction gas outlet 113 of the second heat exchanger 11 through pipelines. The dust-containing liquid droplet outlet 303 is connected to the sedimentation tank 20 through a pipeline. The second valve control module includes a second valve control component A 105A and a second valve control component B 105B. The second valve control component A 105A is arranged at the fraction gas outlet 103 of the first heat exchanger 10, and the second valve control component B 105B is arranged at the fraction gas outlet 113 of the second heat exchanger 11. The second valve control component A 105A is configured to control the on-off state between the fraction gas outlet 103 and the fraction gas heat exchange pipeline, and the second valve control component B 105B is configured to control the on-off state between the fraction gas outlet 113 and the fraction gas heat exchange pipeline. The first controller is communicatively connected to the first pressure gauge 12, the second pressure gauge 13, the second valve control component A 105A, and the second valve control component B 105B respectively. By setting the dust remover 30, the condensed gas phase (mainly including methane, hydrogen, oil droplets, and dust particles) can be separated to obtain the fraction gas after dust removal (mainly including methane and hydrogen) and the dust-containing liquid droplets (including oil droplets and dust particles). Among them, the dust removal principle of the dust remover 30 is that when the wind blows over an obstacle, the air pressure is relatively low near the upper port on the leeward side of the obstacle, thus generating an adsorption effect and causing the flow of air. The dust remover is to make the airflow change from thick to thin to accelerate the gas flow rate, so that a "vacuum" area is formed behind the outlet of the scrubbing dust remover. When this vacuum area approaches the workpiece, it will have a certain adsorption effect on the workpiece. The water flow will be sucked in through the manifold and dispersed for dust removal.

[0085] Further, the third valve control module includes a third valve control component A 106A and a third valve control component B 106B. The third valve control component A 106A is arranged at the first condensate liquid outlet 102, and the third valve control component B 106B is arranged at the second condensate liquid outlet 112. The first controller is communicatively connected to the first pressure gauge 12, the second pressure gauge 13, the third valve control component A 106A, and the third valve control component B 106B respectively.

[0086] In this embodiment, the fraction gas treatment system may further include a sludge removal device, which includes a scraper frame 41 and a scraper conveyor 40 inclinedly installed on the scraper frame 41; the scraper conveyor includes a feeding end and a discharging end; a sedimentation tank 20 and an oil tank 21 are arranged inside the scraper frame 41, and the feeding end of the scraper conveyor 40 extends to the bottom of the sedimentation tank 20. The sludge removal device further includes a sludge discharge port 42, which is located below the discharging end.

[0087] In this embodiment, the scraper conveyor 40 has no corners and is inclinedly installed inside the scraper frame 41 to reduce the stress on the chain. An oil-resistant rubber plate is installed at the bottom of the scraper of the scraper conveyor to ensure no gap between the scraper and the bottom plate of the scraper frame 41. The main function of the scraper frame 41 is to support and fix, and reinforcing ribs are welded on the outside to prevent the sedimentation tank from deforming. The discharging port of the scraper frame 41 needs to be installed on a sealed discharging box. The sludge removal device is integrated with the sedimentation tank 20. The scraper conveyor 40 is in a straight line form, scraping the sludge obliquely upward, having no corners, and reducing the stress on the chain.

[0088] Specifically, the first valve control component A 104A, the first valve control component B 104B, the second valve control component A 105A, the second valve control component B 105B, the third valve control component A 106A, and the third valve control component B 106B each include a first valve (electric or pneumatic) and a second valve (electric or pneumatic). The first valve can be a gate valve, a ball valve, a butterfly valve, or a globe valve, and the second valve can be an eye valve; the first controller controls the first valve (for example, a gate valve) and the second valve (for example, an eye valve) simultaneously. The first valve such as a gate valve plays a role in normal opening and closing, and the second valve such as an eye valve plays an absolute cut-off role for toxic, harmful, and flammable gases. When opening the valve control module, first open the first valve such as a gate valve, and then open the second valve such as an eye valve. When closing the valve control module, first close the second valve such as an eye valve, and then close the first valve such as a gate valve. The first valve control module, the second valve control module, and the third valve control module form a reliable combustible gas isolation module.

[0089] In this embodiment, the operation method of the fraction gas treatment system includes: for example, when the first heat exchanger 10 is in the working state, the pressure of the fraction gas inside the first heat exchanger 10 is detected by the first pressure gauge 12. When the pressure value detected by the first pressure gauge 12 is higher than the set value, an alarm is given and the pressure value is fed back to the first controller. The first controller switches the first valve control module, the second valve control module, and the third valve control module. That is, the first valve control component A 104A, the second valve control component A 105A, and the third valve control component A 106A of the first heat exchanger 10 that are currently in the working state are closed, and at the same time, the first valve control component B 104B, the second valve control component B 105B, and the third valve control component B 106B of the second heat exchanger 11 are opened. The first heat exchanger 10 changes from the working state to the state to be cleaned, and all the air inlets are separated by the first valve control component A 104A, the second valve control component A 105A, and the third valve control component A 106A to prevent gas overflow or air entry. The first valve control component B 104B, the second valve control component B 105B, and the third valve control component B 106B of the second heat exchanger 11 are opened, and the second heat exchanger 11 enters the working state. The cleaning method of the first heat exchanger 10 includes: first, nitrogen is flushed into the fraction gas heat exchange pipeline of the first heat exchanger 10 through the nitrogen gas storage tank 14 to displace the fraction gas in the fraction gas heat exchange pipeline, and then the second valve control component A 105A is opened to press the fraction gas in the first heat exchanger 10 to the rear-end gas treatment equipment, such as the dust collector 30. When the nitrogen is filled for a specified time, the detection port 15 can be opened to detect the concentration of CO and / or H 2 S in the fraction gas heat exchange pipeline of the first heat exchanger 10, and a gas alarm is used to check whether the replacement is completed. When the concentration of CO and / or H 2 S is greater than a specific value, the gas alarm gives an alarm, and the step of passing nitrogen into the fraction gas heat exchange pipeline to displace the fraction gas in the fraction gas heat exchange pipeline is repeated again; if there is no alarm, the top cover can be opened for cleaning, and the cleaning method can be mechanical cleaning, chemical cleaning, high-pressure water cleaning, and steam cleaning. Considering the influence of the subsequent water treatment, steam cleaning is adopted in this embodiment. One end of the backwashing manifold 17 is connected to the bottom of the sedimentation tank 20, and the other end is connected to the backwashing ports of the first heat exchanger 10 and the second heat exchanger 11. A basket filter is added in the middle section of the backwashing manifold 17, and the high-pressure water in the sedimentation tank 20 is used to perform on-line flushing on the first heat exchanger 10 and the second heat exchanger 11.

[0090] In summary, through the above fraction gas treatment system of the present invention, problems commonly existing in existing equipment, such as easy blockage of heat exchangers, difficult cleaning of sediment at the bottom of sedimentation tanks, excessive force on sludge scrapers leading to chain breakage, poor sedimentation effect, serious oil-water emulsification, large amount of wastewater production, and gas overflow caused by heat exchanger blockage resulting in danger, can be effectively solved.

[0091] In the above embodiments of the present invention, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. For the sake of brevity in writing, they will not be elaborated here.

[0092] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A processing system for fraction gas, characterized in that, it includes: a fraction gas inlet pipeline and a heat exchange device, and the heat exchange device includes: a pressure detection module, a first valve control module, a first controller and more than 2 heat exchangers; wherein, each of the heat exchangers includes a fraction gas heat exchange pipeline, and the fraction gas heat exchange pipeline is provided with a fraction gas inlet, a condensed liquid outlet and a fraction gas outlet; all the fraction gas inlets are connected to the fraction gas inlet pipeline, the first valve control module is configured to control the on-off state between all the fraction gas inlets and the fraction gas inlet pipeline, and the first controller is communicatively connected to the pressure detection module and all the first valve control modules; the pressure detection module is configured to detect the pressure of the fraction gas inside the fraction gas heat exchange pipeline currently in the working state and feed back the pressure value to the first controller; the first controller is configured to control the first valve control module to disconnect the connection state between the fraction gas heat exchange pipeline currently in the working state and the fraction gas inlet pipeline and make another fraction gas heat exchange pipeline in the non-working state communicate with the fraction gas inlet pipeline in response to the pressure value detected by the pressure detection module being higher than the set value; the processing system for fraction gas further includes a sedimentation and oil collection device, and the sedimentation and oil collection device includes a sedimentation tank, an oil tank and a partition plate arranged between the sedimentation tank and the oil tank; the sedimentation tank is arranged below the condensed liquid outlet; the height of the top of the partition plate is lower than the height of the top surface of the sedimentation tank and the height of the top surface of the oil tank so that the oil phase in the sedimentation tank can flow over the partition plate into the oil tank; the heat exchange device further includes a backwashing manifold, and each fraction gas heat exchange pipeline further includes a backwashing port, one end of the backwashing manifold is connected to the bottom of the sedimentation tank, and the other end of the backwashing manifold is connected to the backwashing port of the heat exchanger; each heat exchanger further includes a dust removal component, the dust removal component includes a dust remover, and the dust remover includes a dust-containing fraction gas inlet, a fraction gas outlet after dust removal and a dust-containing liquid droplet outlet which are connected through pipelines to the fraction gas outlet, and the dust-containing liquid droplet outlet is connected to the sedimentation tank through a pipeline; the heat exchange device further includes a second valve control module, and the second valve control module is arranged at the fraction gas outlet of each heat exchanger; the second valve control module is configured to control the on-off state between all the fraction gas outlets and the fraction gas heat exchange pipeline, and the first controller is communicatively connected to all the second valve control modules.

2. The processing system for fraction gas according to claim 1, characterized in that, the pressure detection module includes a pressure gauge, and the pressure gauge is arranged on the fraction gas inlet pipeline; or the pressure detection module includes multiple pressure gauges, the number of the pressure gauges is the same as the number of the heat exchangers, and one pressure gauge is arranged at the fraction gas inlet of each heat exchanger.

3. The treatment system for fraction gas according to claim 1, characterized in that, the heat exchange device further includes a gas displacement module; the gas displacement module is configured to displace the fraction gas in the fraction gas heat exchange pipeline.

4. The treatment system for fraction gas according to claim 3, characterized in that, the gas displacement module includes a displacement gas storage tank, and the displacement gas storage tank is connected to all the fraction gas heat exchange pipelines through pipelines; or the gas displacement module includes a plurality of displacement gas storage tanks, the number of the displacement gas storage tanks is the same as the number of the heat exchangers, and each displacement gas storage tank is connected to the corresponding fraction gas heat exchange pipeline through a pipeline; the displacement gas storage tank is a nitrogen gas storage tank.

5. The treatment system for fraction gas according to claim 1, characterized in that, each heat exchanger further includes a detection port and a gas alarm; the detection port is arranged at the lower part of the heat exchanger and is connected to the fraction gas heat exchange pipeline in the heat exchanger through a pipeline, and the detection port is connected to the gas alarm through a pipeline; the gas alarm is configured to detect the concentration of harmful gas at the detection port and give an alarm when the concentration is greater than a specific value.

6. The treatment system for fraction gas according to claim 1, characterized in that, each heat exchanger further includes a cleaning port, and the cleaning port is arranged at the top of the heat exchanger and is connected to the fraction gas heat exchange pipeline in the heat exchanger.

7. The treatment system for fraction gas according to claim 1, characterized in that, a first interface meter, a sewage discharge port and a second controller communicatively connected to the first interface meter and the sewage discharge port are arranged in the sedimentation tank; the first interface meter is configured to display the liquid level height of the aqueous phase in the sedimentation tank.

8. The treatment system for fraction gas according to claim 1, characterized in that, a second interface meter, an oil pumping port, a heavy sedimentation assembly and a third controller communicatively connected to the second interface meter, the oil pumping port and the heavy sedimentation assembly are arranged in the oil tank; the second interface meter is configured to display the liquid level height of the aqueous phase and the liquid level height of the oil phase in the oil tank; the heavy sedimentation assembly is arranged at the bottom of the oil tank and is connected to the sedimentation tank through a pipeline.

9. The treatment system for fraction gas according to claim 8, characterized in that, the heavy sedimentation assembly includes a positive displacement pump or a diaphragm pump.

10. The treatment system for fraction gas according to claim 1, characterized in that, it further includes a sludge removal device, and the sludge removal device includes a scraper frame and a scraper conveyor obliquely installed on the scraper frame; the scraper conveyor includes a feeding end and a discharging end; the sedimentation tank and the oil tank are arranged in the scraper frame, and the feeding end of the scraper conveyor extends to the bottom of the sedimentation tank; the sludge removal device further includes a sludge discharge port, and the sludge discharge port is located below the discharging end.

11. A treatment method for fraction gas, characterized in that, using the treatment system for fraction gas according to any one of claims 1 to 10, the treatment method for fraction gas includes: Obtain the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state and feedback it; and When the pressure value is higher than the set value, disconnect the connection state between the fraction gas heat exchange pipeline currently in the working state and the fraction gas inlet pipeline, and make another fraction gas heat exchange pipeline that is not in the working state be in the connected state with the fraction gas inlet pipeline.

12. The processing method of the fraction gas according to claim 11, characterized in that the step of obtaining the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state and feedbacking it includes: Obtain the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state by detecting the pressure of the fraction gas inside the fraction gas inlet pipeline; or Detect the pressure inside the fraction gas heat exchange pipeline currently in the working state to obtain the pressure of the fraction gas inside the fraction gas heat exchange pipeline of the heat exchanger currently in the working state.

13. The processing method of the fraction gas according to claim 11, characterized in that After the step of disconnecting the connection state between the fraction gas heat exchange pipeline currently in the working state and the fraction gas inlet pipeline, it further includes: cleaning the fraction gas heat exchange pipeline after disconnecting the connection state with the fraction gas inlet pipeline, and the cleaning method includes: Introduce a replacement gas into the fraction gas heat exchange pipeline to continuously replace the fraction gas in the fraction gas heat exchange pipeline within a predetermined time; After the predetermined time ends, obtain the concentration of harmful gases in the fraction gas heat exchange pipeline; When the concentration of the harmful gases is greater than a specific value, issue an alarm and repeat the step of introducing a replacement gas into the fraction gas heat exchange pipeline to continuously replace the fraction gas in the fraction gas heat exchange pipeline within a predetermined time; and When there is no alarm, clean the fraction gas heat exchange pipeline.

Images