Carbon dioxide fracturing exhaust mute recycling system and recycling method

Abstract

The invention discloses a carbon dioxide fracturing exhaust mute recycling system which comprises a gas production pipe collection, the gas production pipe collection is connected with an inlet of a gas inlet silencer through a pipeline, an outlet of the gas inlet silencer is connected with an inlet of a middle buffer tank through a pipeline, and the middle buffer tank is provided with two outlets. One outlet is connected with an inlet of a booster pump through a pipeline, an outlet of the booster pump is connected with a water-separating gas filter through a pipeline, the other outlet of the middle buffer tank is connected to a pipeline between the booster pump and the water-separating gas filter through a pipeline, and the water-separating gas filter is connected with an inlet of a gas storage tank through a pipeline; an outlet of the gas storage tank is connected with a gas outlet pipe collection and a purging collection pipe through a pipeline, and the purging collection pipe is connected with an inlet of the middle buffer tank through a pipeline. The problems that in the prior art, after work is finished, gas is directly discharged into the atmosphere, and the exhaust noise is large are solved. The invention further discloses a carbon dioxide fracturing exhaust mute recycling method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of carbon dioxide fracturing devices, and relates to a carbon dioxide fracturing exhaust gas silencing recycling system. BACKGROUND

[0002] The carbon dioxide fracturing technology is a new technology developed in recent years, which uses carbon dioxide to replace the conventional water-based fracturing fluid and has a series of advantages, and is applied more and more widely in major oilfields at home and abroad.

[0003] At present, the carbon dioxide fracturing related equipment does not have a carbon dioxide exhaust gas recycling device, including a pressurizing device, a pumping device, a sand mixing device and an inlet and outlet manifold, so that carbon dioxide is directly discharged into the atmosphere in the pre-cooling stage before operation, the operation construction stage and the gas after the work is completed, especially the pressurizing device, because the exhaust valve on the gas-liquid separator is always in an open state during the working process, not only the exhaust noise is large, but also a large amount of carbon dioxide is directly discharged and wasted, which is neither economical nor environmentally friendly. SUMMARY

[0004] The application aims to provide a carbon dioxide fracturing exhaust gas silencing recycling system, which solves the problems of direct discharge of gas into the atmosphere after work and large exhaust noise in the prior art.

[0005] Another object of the application is to provide a carbon dioxide fracturing exhaust gas silencing recycling method.

[0006] The technical scheme adopted by the application is that the carbon dioxide fracturing exhaust gas silencing recycling system comprises a gas collection manifold, the gas collection manifold is connected through a pipeline to an inlet of an inlet silencer, an outlet of the inlet silencer is connected through a pipeline to an inlet of an intermediate buffer tank, the intermediate buffer tank is provided with two outlets, one outlet is connected through a pipeline to an inlet of a booster pump, an outlet of the booster pump is connected through a pipeline to a water separation and gas filter, the other outlet of the intermediate buffer tank is connected through a pipeline to a pipeline between the booster pump and the water separation and gas filter, the water separation and gas filter is connected through a pipeline to an inlet of a gas storage tank, an outlet of the gas storage tank is connected through a pipeline to a gas outlet manifold and a purge manifold, and the purge manifold is connected through a pipeline to an inlet of the intermediate buffer tank.

[0007] The application is characterized in that:

[0008] The gas gathering manifold comprises several gas gathering manifolds and a main pipe a, each of the gas gathering manifolds is communicated with one end of the main pipe a, each of the gas gathering manifolds comprises a flexible pipe a communicated with one end of the main pipe a, one end of the flexible pipe a away from the main pipe a is connected with a quick connector a, a one-way valve a is further arranged on the flexible pipe a between the quick connector a and the connection point of the main pipe a, the flexible pipe a is communicated with the exhaust port of the carbon dioxide fracturing equipment through the quick connector a, the main pipe a is a metal hard pipe, and the other end of the main pipe a is connected with the inlet of the gas inlet silencer through a pipeline.

[0009] The gas inlet silencer adopts a multi-stage cylindrical metal structure, specifically comprising three coaxial metal cylinders arranged in a nested manner from outside to inside, each metal cylinder is provided with an air inlet and an air outlet at both axial ends, the air inlets of the three metal cylinders are located on the same side and have the same diameter, are coaxial with the metal cylinders and are communicated, the air outlets of the three metal cylinders are located on the same side and are coaxial with the metal cylinders and are communicated, the air outlet of the metal cylinder in the middle has a larger diameter than the air outlets on the metal cylinders at the innermost side and the outermost side, a plurality of air holes are uniformly arranged on the side wall of the air outlet of the metal cylinder in the middle, a plurality of air holes are uniformly arranged on the cylinder walls of the metal cylinders at the innermost side and the middle layer, a plurality of guide vanes are uniformly arranged on the inner sides of the three metal cylinders, one end of the guide vanes on the metal cylinders at the innermost side and the outermost side close to the axial center is inclined towards the air inlet, one end of the guide vanes on the metal cylinder at the middle layer close to the axial center is inclined towards the air outlet, the guide vanes on the metal cylinder at the outermost side are further provided with air holes, the air inlet of the outermost metal cylinder of the gas inlet silencer is communicated with the outlet of the main pipe a through a pipeline, the air outlet of the outermost metal cylinder of the gas inlet silencer is communicated with the inlet of the intermediate buffer tank through a pipeline, and the gas inlet silencer is used for silencing the collected carbon dioxide exhaust gas flow.

[0010] The intermediate buffer tank is provided with two inlets, two outlets and one drainage and sewage outlet, the air outlet of the gas inlet silencer is communicated with one of the inlets of the intermediate buffer tank through a pipeline, the other inlet of the intermediate buffer tank is connected with the purge manifold through a pipeline, the drainage and sewage outlet is connected with an electrically operated on-off valve b, the tank body of the intermediate buffer tank is further provided with a safety valve a, a pressure gauge a and a pressure sensor a, an electrically operated on-off valve c is arranged on the pipeline between the one outlet of the intermediate buffer tank and the inlet of the booster pump, a one-way valve c and a safety valve b are arranged in sequence on the pipeline between the one outlet of the intermediate buffer tank and the outlet of the booster pump from the intermediate buffer tank to the booster pump, the safety valve b is further provided with an electrically operated on-off valve d in parallel, and a one-way valve and an electrically operated on-off valve e are arranged in sequence on the pipeline between the intermediate buffer tank and the purge manifold from the intermediate buffer tank to the purge manifold.

[0011] The outlet of the booster pump is provided with a pressure gauge b and a pressure sensor b, and is divided into two paths after the pressure sensor b, one path is connected with the outlet of the intermediate buffer tank, and the other path is connected with the inlet of the water separation and gas filter.

[0012] The gas storage tank body is provided with an inlet, an outlet and a drainage and blowdown port, the inlet of the gas storage tank and the outlet of the water filter are connected through a pipeline, the drainage and blowdown port of the gas storage tank is provided with an electric switch valve g, the gas storage tank body is further provided with a safety valve c, a pressure gauge c and a pressure sensor c, the pipeline between the inlet of the gas storage tank and the outlet of the water filter is further provided with a check valve d and an electric switch valve f in sequence from the water filter to the gas storage tank, the outlet of the gas storage tank is connected to a gas outlet pipe through a pipeline, and the pipeline between the gas storage tank and the gas outlet pipe is provided with an electric switch valve h, a pressure regulating valve, a pressure gauge d and a pressure sensor d in sequence from the gas storage tank to the gas outlet pipe, and the pressure regulating valve is further connected in parallel with an electric switch valve i through a pipeline.

[0013] The gas outlet pipe collection includes a plurality of gas outlet pipe collections and a main pipe b, each gas outlet pipe collection is communicated with the main pipe b, and each gas outlet pipe collection includes a flexible pipe c communicated with the main pipe b, and the flexible pipe c is provided with an electric switch valve j, a flow regulating valve and a quick connector b in sequence from the side close to the gas storage tank to the side far away from the gas storage tank, the quick connector b is communicated with the gas inlet of the gas using equipment, the main pipe b is a metal hard pipe, and the outlet of the gas storage tank is connected to the main pipe b through a pipeline.

[0014] The purge pipe collection includes a flexible pipe b, one end of the flexible pipe b is connected to the pipeline between the main pipe b and the pressure sensor d, the other end of the flexible pipe b is connected to an inlet of the intermediate buffer tank, and the flexible pipe b is further provided with an electric switch valve k.

[0015] The second technical scheme of the present application is a carbon dioxide fracturing exhaust gas silent recycling method, which adopts the carbon dioxide fracturing exhaust gas silent recycling system, and specifically comprises the following steps:

[0016] Before work: the quick connector a on the gas collection pipe is communicated with the exhaust port of the carbon dioxide fracturing equipment;

[0017] Gas recovery: the gas is sequentially collected from the main pipe a to the silencer, the intermediate buffer tank, the booster pump, the water filter and the gas storage tank;

[0018] Gas use: the quick connector b of the gas outlet pipe is communicated with the gas inlet of the gas using equipment, any gas use can be turned off by controlling the electric switch valve j, and any flow can be regulated by controlling the flow regulating valve, and the gas is used.

[0019] The second technical scheme of the present application is characterized in that:

[0020] Gas recovery: open the electric switch valve a, close other electric switch valves and safety valves, start the booster pump (4), and the gas flows along the gas collection pipe quick connector a, one-way valve a, flexible pipe a, main pipe a, and then into the gas inlet silencer. The high-speed gas flow is subjected to silencing treatment, and then enters the intermediate buffer tank through one-way valve b and electric switch valve a. When the gas in the intermediate buffer tank reaches the set safety pressure, electric switch valve c and electric switch valve f are opened. Under the action of the booster pump, the gas in the intermediate buffer tank is pressurized by the booster pump and then enters the water separation and gas filter. The gas flow is subjected to water removal and decontamination in the water separation and gas filter, and then enters the gas storage tank through one-way valve d and electric switch valve f for storage.

[0021] In the gas recovery process, bypass pressure relief return is achieved by opening the safety valve b, and partial return is achieved by opening the electric switch valve.

[0022] When gas is needed, the gas outlet pipe quick connector b is connected to the gas inlet of the gas using equipment in advance, and then electric switch valve h, electric switch valve i, and electric switch valve j are opened in sequence. According to the pressure of pressure gauge d and pressure sensor d, if the pressure in the gas storage tank needs to be adjusted, the pressure regulating valve is opened. If no adjustment is needed, only electric switch valve i needs to be opened. At this time, the gas flow enters the gas using equipment along electric switch valve h, electric switch valve i or the pressure regulating valve, electric switch valve j, flow regulating valve, flexible pipe c, and quick connector b. Any gas flow can be turned off by controlling electric switch valve j, and any flow can be regulated by controlling the flow regulating valve.

[0023] When cleaning is needed, electric switch valve e of the intermediate buffer tank and electric switch valve k of the cleaning pipe are opened, and the pressurized gas in the gas storage tank is used to clean the intermediate buffer tank.

[0024] The beneficial effects of the present application are:

[0025] The present application overcomes the problems of direct discharge of a large amount of carbon dioxide gas into the atmosphere and high exhaust noise in the current carbon dioxide fracturing process, and makes the carbon dioxide fracturing operation process more green, environmentally friendly, and economical. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the carbon dioxide fracturing exhaust gas silent recycling system of the present application;

[0027] Figure 2 is a structural schematic diagram of the gas inlet silencer in the carbon dioxide fracturing exhaust gas silent recycling system of the present application;

[0028] Figure 3 is Figure 2 the left view of

[0029] In the diagram: 1-Gas collection pipe manifold, 101-Gas collection pipe assembly, 102-Main pipe a, 1011-Quick connector a, 1012-Check valve a, 1013-Flexible pipe a, 2-Inlet silencer, 201-Inlet, 202-Outlet, 203-Ventilation hole, 204-Guide plate, 3-Intermediate buffer tank, 301-Safety valve a, 302-Pressure gauge a, 303-Pressure sensor a, 304-Check valve b, 305-Electric switch valve a, 306-Electric switch valve b, 307-Electric switch valve c, 308-Check valve c, 309-Safety valve b, 310-Electric switch valve d, 311-Electric switch valve e, 4-Booster pump, 401-Pressure gauge b, 402-Pressure sensor b, 5-Water separator and air filter, 6-Air tank, 601-Safety valve c, 602-Pressure gauge c, 603-Pressure sensor c, 604-Check valve d, 605-Electric switch valve f, 606-Electric switch valve g, 607-Electric switch valve h, 608-Electric switch valve i, 609-Pressure regulator valve, 610-Pressure gauge d, 611-Pressure sensor d, 7-Outlet manifold, 701-Outlet manifold, 702-Main pipe b, 7011-Quick connector b, 7012-Electric switch valve j, 7013-Flow regulating valve, 7014-Flexible pipe b, 8-Purge manifold, 801-Electric switch valve, 802-Flexible pipe b. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] The present invention relates to a silent carbon dioxide fracturing exhaust gas recovery and utilization system, the structure of which is as follows: Figure 1 As shown, the system includes a gas sampling pipe manifold 1, which is connected to the inlet of an air intake silencer 2 via a pipeline. The outlet of the air intake silencer 2 is connected to the inlet of an intermediate buffer tank 3 via a pipeline. The intermediate buffer tank 3 has two outlets. One outlet is connected to the inlet of a booster pump 4 via a pipeline. The outlet of the booster pump 4 is connected to a water separator filter 5 via a pipeline. The other outlet of the intermediate buffer tank 3 is connected to the pipeline between the booster pump 4 and the water separator filter 5 via a pipeline. The water separator filter 5 is connected to the inlet of a gas storage tank 6 via a pipeline. The outlet of the gas storage tank 6 is connected to an outlet pipe manifold 7 and a purge manifold 8 via a pipeline. The purge manifold 8 is connected to the inlet of the intermediate buffer tank 3 via a pipeline.

[0033] The working principle of the embodiment is that the gas collection pipe set 1 is communicated with the exhaust port of the carbon dioxide fracturing equipment, the gas outlet pipe set 7 is communicated with the gas inlet port of the gas using equipment, the gas passes through the inlet silencer 2 for silencing treatment of the high-speed gas flow with pressure, and then enters the intermediate buffer tank 3, the gas in the intermediate buffer tank 3 is pressurized by the booster pump 4 and then enters the water separation and gas filter 5, the gas flow enters the gas storage tank 6 for storage after being dehydrated and decontaminated in the water separation and gas filter 5, and an electric valve is arranged between the gas storage tank 6 and the gas outlet pipe set 7, if the gas is needed, the corresponding electric valve is opened.

[0034] An electric valve is arranged on the pipeline between the purge manifold 8 and the intermediate buffer tank 3, if the intermediate buffer tank 3 needs to be purged and cleaned, the corresponding electric valve is opened to use the pressurized gas in the gas storage tank 6 to purge and clean the intermediate buffer tank 3.

[0035] Embodiment 2

[0036] On the basis of embodiment 1, the gas collection pipe set 1 includes a plurality of gas collection pipes 101 and a main pipe a 102, each gas collection pipe 101 is communicated with one end of the main pipe a 102, each gas collection pipe 101 includes a flexible pipe a 1013 communicated with one end of the main pipe a 102, the end of the flexible pipe a 1013 away from the main pipe a 102 is connected with a quick connector a 1011, a one-way valve a 1012 is further arranged on the flexible pipe a 1013 between the quick connector a 1011 and the connection point of the main pipe a 102, the flexible pipe a 1013 is communicated with the exhaust port of the carbon dioxide fracturing equipment through the quick connector a 1011 to realize gas drainage and collection, the main pipe a 102 is a metal hard pipe, and the other end of the main pipe a 102 is connected with the inlet of the inlet silencer 2 through a pipeline.

[0037] The inlet silencer 2 adopts a multi-stage cylindrical metal structure, for example Figures 2-3As shown, it specifically includes three coaxial metal cylinders arranged from outside to inside, each metal cylinder is provided with an air inlet 201 and an air outlet 202 at both axial ends, the air inlets 201 of the three metal cylinders are located on the same side and have the same diameter, and are coaxial with the metal cylinders and communicate with each other, the air outlets 202 of the three metal cylinders are located on the same side and are coaxial with the metal cylinders and communicate with each other, the air outlet 202 of the metal cylinder in the middle has a larger diameter than the air outlets 202 on the innermost and outermost metal cylinders, a plurality of air holes 203 are uniformly arranged on the sidewall of the air outlet 202 of the metal cylinder in the middle, a plurality of air holes 203 are uniformly arranged on the cylinder wall of the innermost and middle metal cylinders, a plurality of guide vanes 204 are uniformly arranged on the inner side of the three metal cylinders, one end of the guide vane 204 on the innermost and outermost metal cylinders close to the axis of the metal cylinder is inclined towards the air inlet 201, one end of the guide vane 204 on the middle metal cylinder close to the axis of the metal cylinder is inclined towards the air outlet 202, the guide vane 204 on the outermost metal cylinder is further provided with an air hole 203, the air inlet 201 of the outermost metal cylinder of the air inlet silencer 2 is connected with the outlet of the main pipe a102 through a pipeline, the air outlet 202 of the outermost metal cylinder of the air inlet silencer 2 is connected with the inlet of the middle buffer tank 3 through a pipeline, and the air silencer 2 is used for silencing the collected carbon dioxide exhaust gas flow. Figure 3 As shown, the side view of the guide vane 204 is isosceles trapezoidal, and the width of one end close to the metal cylinder is greater than that of one end close to the axis of the metal cylinder.

[0038] The tank body of the middle buffer tank 3 is provided with two inlets, two outlets and one drainage and sewage outlet, the air outlet of the air inlet silencer 2 is connected with one inlet of the middle buffer tank 3 through a pipeline, the other inlet of the middle buffer tank 3 is connected with the purge manifold 8 through a pipeline, the drainage and sewage outlet is connected with an electrically operated on-off valve b306, the tank body of the middle buffer tank 3 is further provided with a safety valve a301, a pressure gauge a302 and a pressure sensor a303; an electrically operated on-off valve c307 is arranged on the pipeline between the one outlet of the middle buffer tank 3 and the inlet of the booster pump 4, a check valve c308 and a safety valve b309 are arranged in sequence on the pipeline between the one outlet of the middle buffer tank 3 and the outlet of the booster pump 4 from the middle buffer tank 3 to the booster pump 4, and an electrically operated on-off valve d310 is further arranged on the safety valve b309; a check valve 312 and an electrically operated on-off valve e311 are arranged in sequence on the pipeline between the middle buffer tank 3 and the purge manifold 8 from the middle buffer tank 3 to the purge manifold 8.

[0039] The intermediate buffer tank 3 is used for buffering and storing the collected gas, and the safety valve a301, pressure gauge a302 and pressure sensor a303 are arranged on the intermediate buffer tank 3, so that the gas pressure can be adjusted and controlled, the overpressure automatic pressure relief function can be realized, and the pressure display, pressure maintaining and overpressure automatic pressure relief functions can be realized. At the same time, in order to avoid the impact and damage to the water separation and gas filter 5 caused by the excessively high gas pressure or excessively large flow rate at the outlet of the booster pump, bypass pressure relief backflow is realized through the safety valve b309, and partial backflow is realized through the electrically operated on-off valve d310.

[0040] The pressure gauge b401 and pressure sensor b402 are arranged at the outlet of the booster pump 4, and after the pressure sensor b402, the outlet of the intermediate buffer tank 3 is connected to one of the two paths, and the inlet of the water separation and gas filter 5 is connected to the other path.

[0041] The tank body of the gas storage tank 6 is provided with one inlet, one outlet and one drainage and sewage outlet, the inlet of the gas storage tank 6 is connected to the outlet of the water separation and gas filter 5 through a pipeline, the electrically operated on-off valve g606 is arranged on the drainage and sewage outlet of the gas storage tank 6, the safety valve c601, pressure gauge c602 and pressure sensor c603 are arranged on the tank body of the gas storage tank 6, the one-way valve d604 and electrically operated on-off valve f605 are arranged in sequence on the pipeline between the inlet of the gas storage tank 6 and the outlet of the water separation and gas filter 5 from the water separation and gas filter 5 to the gas storage tank 6, the outlet of the gas storage tank 6 is connected to the gas outlet pipe collection 7 through a pipeline, the electrically operated on-off valve h607, pressure regulating valve 609, pressure gauge d610 and pressure sensor d611 are arranged in sequence on the pipeline between the gas storage tank 6 and the gas outlet pipe collection 7 from the gas storage tank 6 to the gas outlet pipe collection 7, the electrically operated on-off valve i608 is connected to the pressure regulating valve 609 through a pipeline in parallel, and the purge pipe collection 8 is connected between the gas outlet pipe collection 7 and the pressure sensor d611.

[0042] The safety valve c601, pressure gauge c602 and pressure sensor c603 are also arranged on the gas storage tank 6, so that the gas pressure can be adjusted and controlled, and the overpressure automatic pressure relief function can be realized.

[0043] The electrically operated on-off valve i608 and pressure regulating valve 609 are bypassed and connected in parallel, and the pressure gauge c610 and pressure sensor c611 are arranged at the outlet thereof, the pressure regulating valve 609 is operated, adjusted and controlled according to the pressure display, and the electrically operated on-off valve i608 is directly opened without pressure regulation.

[0044] The gas outlet manifold 7 comprises a plurality of gas outlet manifolds 701 and a main pipe b 702, each of the gas outlet manifolds 701 is communicated with the main pipe b 702, the gas outlet manifold 701 comprises a flexible pipe c 7014 communicated with the main pipe b 702, the flexible pipe c 7014 is sequentially provided with an electric switch valve j 7012, a flow regulating valve 7013 and a quick connector b 7011 from the direction close to the gas storage tank 6 to the direction away from the gas storage tank 6, the quick connector b 7011 is communicated with the gas inlet of the gas equipment, the main pipe b 702 is a metal hard pipe, and the outlet of the gas storage tank 6 is connected with the main pipe b 702 through a pipeline.

[0045] The purge pipe manifold 8 comprises a flexible pipe b 802, one end of the flexible pipe b 802 is connected with a pipeline between the main pipe b 702 and the pressure sensor d 611, the other end of the flexible pipe b 802 is connected with an inlet of the intermediate buffer tank 3, and the flexible pipe b 802 is further provided with an electric switch valve k 801, the intermediate buffer tank 3 is purged and cleaned by using the gas with pressure in the gas storage tank 6 through the electric switch valve e 311 arranged in the intermediate buffer tank 3 and the electric switch valve k 801 in the purge pipe manifold 8.

[0046] Embodiment 3

[0047] The carbon dioxide fracturing exhaust gas silent recycling method adopts the carbon dioxide fracturing exhaust gas silent recycling system of embodiment 2, and specifically comprises the following steps.

[0048] Before work: according to the number of exhaust outlets of the carbon dioxide fracturing related equipment, a corresponding number of gas collecting manifolds are arranged, and the quick connector a 1011 on the gas collecting manifold 101 is communicated with the exhaust outlet of the carbon dioxide fracturing equipment;

[0049] Gas recovery: the gas is sequentially collected from the main pipe a 102 to the silencer 2, the intermediate buffer tank 3, the booster pump 4, the water separation and gas filter 5 and the gas storage tank 6.

[0050] Gas use: the quick connector b 7011 of the gas outlet manifold 701 is communicated with the gas inlet of the gas equipment, any gas use is turned off through the control of the electric switch valve j 7012, any flow is regulated through the control of the flow regulating valve 7013, and the gas is used.

[0051] Gas recovery: open electric switch valve a305, other electric switch valves and safety valve closed, start booster pump 4, gas along gas pipe manifold quick connector a1011, one-way valve a1012, flexible pipe a1013 to main pipe a102, then into the inlet silencer 2, the high-speed airflow with pressure is treated by silencer, the airflow after silencer treatment enters the intermediate buffer tank 3 through one-way valve b304 and electric switch valve a305, when the gas in the intermediate buffer tank 3 reaches the set safety pressure, open electric switch valve c307 and electric switch valve f605, under the action of booster pump 4, the gas in the intermediate buffer tank 3 is pressurized by the booster pump 4 and enters the water separation and gas filter 5, the airflow is dehydrated and decontaminated in the water separation and gas filter 5, then enters the gas storage tank 6 through one-way valve d604 and electric switch valve f605 for storage;

[0052] Wherein, during gas recovery, bypass pressure relief return is performed by opening safety valve b309, and partial return is performed by opening electric switch valve 310;

[0053] When gas is needed: first connect the quick connector b7011 of the outlet pipe manifold 701 with the gas inlet of the gas using equipment, then open electric switch valve h607, electric switch valve i608 and electric switch valve j7012 in sequence, according to the pressure of pressure gauge d610 and pressure sensor d611, if the pressure in the gas storage tank 6 needs to be adjusted, open pressure regulating valve 609, if no adjustment is needed, only electric switch valve i608 needs to be opened, at this time, the airflow enters the gas using equipment along electric switch valve h607, electric switch valve i608 or pressure regulating valve 609, electric switch valve j7012, flow regulating valve 7013, flexible pipe c7014 and quick connector b7011, any route gas cutoff can be performed by controlling electric switch valve j7012, and any route flow regulation can be performed by controlling flow regulating valve 7013;

[0054] When cleaning is needed, open electric switch valve e311 of the intermediate buffer tank 3 and electric switch valve k801 of the purge pipe manifold 8, and use the gas with pressure in the gas storage tank 6 to purge and clean the intermediate buffer tank 3.

Claims

1. A carbon dioxide fracturing exhaust gas silencing recycling system, characterized in that, The application relates to a gas collecting pipe set (1) which is connected with the inlet of an air inlet silencer (2) through a pipeline, the outlet of the air inlet silencer (2) is connected with the inlet of an intermediate buffer tank (3) through a pipeline, the intermediate buffer tank (3) is provided with two outlets, one outlet is connected with the inlet of a booster pump (4) through a pipeline, the outlet of the booster pump (4) is connected with a water separation and gas filter (5) through a pipeline, the other outlet of the intermediate buffer tank (3) is connected with the pipeline between the booster pump (4) and the water separation and gas filter (5), the water separation and gas filter (5) is connected with the inlet of a gas storage tank (6) through a pipeline, the outlet of the gas storage tank (6) is connected with a gas outlet pipe set (7) and a purge manifold (8) through a pipeline, and the purge manifold (8) is connected with the inlet of the intermediate buffer tank (3) through a pipeline.

2. The carbon dioxide fracturing de- exhaust quiet recycling system according to claim 1, characterized in that, The gas collecting pipe set (1) comprises a plurality of gas collecting pipe sets (101) and a main pipe a (102), each gas collecting pipe set (101) is communicated with one end of the main pipe a (102), each gas collecting pipe set (101) comprises a flexible pipe a (1013) communicated with one end of the main pipe a (102), one end of the flexible pipe a (1013) away from the main pipe a (102) is connected with a quick connector a (1011), a one-way valve a (1012) is further arranged on the flexible pipe a (1013) between the quick connector a (1011) and the connection point of the main pipe a (102), the flexible pipe a (1013) is communicated with the exhaust port of a carbon dioxide fracturing device through the quick connector a (1011), the main pipe a (102) is a metal hard pipe, and the other end of the main pipe a (102) is connected with the inlet of the air inlet silencer (2) through a pipeline.

3. The carbon dioxide fracturing de- emission silencing recycling system according to claim 2, characterized in that, The intake silencer (2) adopts a multi-stage cylindrical metal structure, including three coaxial metal cylinders nested from outside to inside, each metal cylinder is provided with an air inlet (201) and an air outlet (202) at both axial ends, the air inlets (201) of the three metal cylinders are located on the same side and have the same diameter, and are coaxial with the metal cylinders and communicate with each other, the air outlets (202) of the three metal cylinders are located on the same side and are coaxial with the metal cylinders and communicate with each other, the air outlet (202) of the middle metal cylinder has a larger diameter than the air outlets (202) on the innermost and outermost metal cylinders, a plurality of air holes (203) are uniformly arranged on the side wall of the air outlet (202) of the middle metal cylinder, a plurality of air holes (203) are uniformly arranged on the cylinder wall of the innermost and middle metal cylinders, a plurality of guide vanes (204) are uniformly arranged on the inner side of the three metal cylinders, the end of the guide vane (204) on the innermost and outermost metal cylinders close to the axis of the metal cylinder is inclined towards the air inlet (201), the end of the guide vane (204) on the middle metal cylinder close to the axis of the metal cylinder is inclined towards the air outlet (202), the guide vane (204) on the outermost metal cylinder is further provided with an air hole (203), the air inlet (201) of the outermost metal cylinder of the intake silencer (2) is communicated with the outlet of the main pipe a (102) through a pipeline, and the air outlet (202) of the outermost metal cylinder of the intake silencer (2) is communicated with the inlet of the intermediate buffer tank (3) through a pipeline.

4. The carbon dioxide fracturing de- emission quieting recycling system according to any one of claims 1-3, characterized in that, The intermediate buffer tank (3) is provided with two inlets, two outlets and one drainage and sewage outlet on the tank body, the air outlet of the intake silencer (2) is communicated with one inlet of the intermediate buffer tank (3) through a pipeline, the other inlet of the intermediate buffer tank (3) is connected with the purge manifold (8) through a pipeline, the drainage and sewage outlet is connected with an electrically operated on-off valve b (306), the tank body of the intermediate buffer tank (3) is further provided with a safety valve a (301), a pressure gauge a (302) and a pressure sensor a (303); an electrically operated on-off valve c (307) is arranged on the pipeline between the one outlet of the intermediate buffer tank (3) and the inlet of the booster pump (4), a check valve c (308) and a safety valve b (309) are arranged in sequence on the pipeline between the one outlet of the intermediate buffer tank (3) and the outlet of the booster pump (4) from the intermediate buffer tank (3) to the booster pump (4), and an electrically operated on-off valve d (310) is further arranged on the safety valve b (309); a check valve (312) and an electrically operated on-off valve e (311) are arranged in sequence on the pipeline between the intermediate buffer tank (3) and the purge manifold (8) from the intermediate buffer tank (3) to the purge manifold (8).

5. The carbon dioxide fracturing de-venting silencing recycling system according to claim 4, characterized in that, The outlet of the booster pump (4) is provided with a pressure gauge b (401) and a pressure sensor b (402), and is divided into two ways after the pressure sensor b (402), one way is connected with the outlet of the intermediate buffer tank (3), and the other way is connected with the inlet of the water separation and air filter (5).

6. The carbon dioxide fracturing de- exhaust silencing recycling system according to claim 5, characterized in that, The gas tank (6) is provided with an inlet, an outlet and a drainage outlet, the inlet of the gas tank (6) is connected with the outlet of the water filter (5) through a pipeline, the drainage outlet of the gas tank (6) is provided with an electric switch valve g (606), the gas tank (6) is further provided with a safety valve c (601), a pressure gauge c (602) and a pressure sensor c (603), a one-way valve d (604) and an electric switch valve f (605) are sequentially arranged on the pipeline between the inlet of the gas tank (6) and the outlet of the water filter (5) from the water filter (5) to the gas tank (6), the outlet of the gas tank (6) is connected with the gas outlet manifold (7) through a pipeline, and the pipeline between the gas tank (6) and the gas outlet manifold (7) is sequentially provided with an electric switch valve h (607), a pressure regulating valve (609), a pressure gauge d (610) and a pressure sensor d (611) from the gas tank (6) to the gas outlet manifold (7), the pressure regulating valve (609) is further connected with an electric switch valve i (608) through a pipeline in parallel, and the gas outlet manifold (7) and the pressure sensor d (611) are further connected with the purge pipe manifold (8).

7. The carbon dioxide fracturing de- exhaust silencing recycling system according to claim 6, characterized in that, The gas outlet manifold (7) comprises a plurality of gas outlet manifolds (701) and a main pipe b (702), each gas outlet manifold (701) communicates with the main pipe b (702), the gas outlet manifold (701) comprises a flexible pipe c (7014) communicating with the main pipe b (702), the flexible pipe c (7014) is sequentially provided with an electric switch valve j (7012), a flow regulating valve (7013) and a quick connector b (7011) from the direction close to the gas tank (6) to the direction away from the gas tank (6), the quick connector b (7011) communicates with the gas inlet of the gas equipment, the main pipe b (702) is a metal hard pipe, and the outlet of the gas tank (6) is connected with the main pipe b (702) through a pipeline.

8. The carbon dioxide fracturing de- exhaust silencing recycling system according to claim 7, characterized in that, The purge pipe manifold (8) comprises a flexible pipe b (802), one end of the flexible pipe b (802) is connected on the pipeline between the main pipe b (702) and the pressure sensor d (611), the other end of the flexible pipe b (802) is connected with one inlet of the intermediate buffer tank (3), and the flexible pipe b (802) is further provided with an electric switch valve k (801).

9. A method of carbon dioxide fracturing exhaust silencing recycling, characterized in that, The carbon dioxide fracturing exhaust gas silencing recycling system of claim 8 is used, and specifically is: Before work starts: the quick connector a (1011) on the gas recovery manifold (101) is communicated with the exhaust port of the carbon dioxide fracturing equipment; When gas is recovered: the gas is sequentially recovered from the main pipe a (102) to the silencer (2), the intermediate buffer tank (3), the booster pump (4), the water filter (5) and the gas tank (6); Need to use gas: the quick connector b (7011) of the outlet gas manifold (701) is communicated with the gas inlet of the gas using equipment, any road gas cutoff can be carried out by controlling the electric switch valve j (7012), any road flow regulation can be carried out by controlling the flow regulating valve (7013), and the use is carried out.

10. The carbon dioxide fracturing de- exhaust silencing recycling method according to claim 9, characterized in that, Gas recovery: open electric switch valve a (305), other electric switch valves and safety valve are closed, start booster pump (4), gas is collected along gas collection pipe quick connector a (1011), one-way valve a (1012), flexible pipe a (1013) to main pipe a (102) in turn, and then flows into the inlet gas silencer (2), the high-speed gas flow with pressure is treated by silencing, the gas flow after silencing treatment enters the intermediate buffer tank (3) through one-way valve b (304) and electric switch valve a (305), when the gas in the intermediate buffer tank (3) reaches the set safety pressure, open electric switch valve c (307) and electric switch valve f (605), under the action of booster pump (4), the gas in the intermediate buffer tank (3) is pressurized by booster pump (4) and enters the water separation and gas filter (5), the gas flow is treated by water removal and pollution removal in the water separation and gas filter (5), and then enters the gas storage tank (6) through one-way valve d (604) and electric switch valve f (605) for storage; Wherein, when recovering gas, bypass pressure relief return is carried out by opening safety valve b (309), and partial return is carried out by opening electric switch valve 310. Need to use gas: first, the quick connector b (7011) of the outlet gas manifold (701) is communicated with the gas inlet of the gas using equipment, then electric switch valve h (607), electric switch valve i (608) and electric switch valve j (7012) are opened in turn, according to the pressure of pressure gauge d (610) and pressure sensor d (611), if it is necessary to adjust the pressure in the gas storage tank (6), open the pressure regulating valve (609), if it is not necessary to adjust, only electric switch valve i (608) needs to be opened, at this time, the gas flow enters the gas using equipment along electric switch valve h (607), electric switch valve i (608) or pressure regulating valve (609), electric switch valve j (7012), flow regulating valve (7013), flexible pipe c (7014), quick connector b (7011), any road gas cutoff can be carried out by controlling electric switch valve j (7012), and any road flow regulation can be carried out by controlling flow regulating valve (7013). Need to carry out purging and cleaning, open electric switch valve e (311) arranged in the intermediate buffer tank (3) and electric switch valve k (801) in the purging pipe manifold (8), and use the gas with pressure in the gas storage tank (6) to purge and clean the intermediate buffer tank (3).

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