CN-121977326-A - Vehicle-mounted scattered natural gas liquefaction system

CN121977326ACN 121977326 ACN121977326 ACN 121977326ACN-121977326-A

Abstract

The invention discloses a vehicle-mounted scattered natural gas liquefaction system which comprises a carrier, a storage tank, a low-temperature heat exchanger and a gas-liquid separator, wherein a fluid pretreatment device is arranged at the inlet of the low-temperature heat exchanger, the fluid pretreatment device comprises a buffering and steady-flow mechanism, a throttling adjusting mechanism and a flow equalizing and distributing assembly, a heat exchange core body is fixedly arranged above the flow equalizing and distributing assembly, the buffering and steady-flow mechanism comprises a buffer, a turbine rotor is arranged in the buffer, the throttling adjusting mechanism is a venturi tube, a floating body adjusting part is arranged at the throat part of the venturi tube, the flow equalizing and distributing assembly comprises a conical distributor and a damping and current equalizing plate, a plurality of flow dividing holes are formed in the conical surface of the conical distributor, and a plurality of bending holes are formed in the damping and current equalizing plate. The invention realizes the flow equalization and stabilization of the fluid entering the heat exchanger by arranging the buffer flow stabilizing mechanism, the throttling adjusting mechanism and the flow equalization distribution assembly.

Inventors

FAN QINGHU
NIE CHENGXIN
ZHAO YAXIAN
Wan Xianliang
ZHANG CHUNCHENG
Jing Wuqi

Assignees

杭州冰冷科技(集团)有限公司

Dates

Publication Date: 20260505
Application Date: 20260122

Claims (8)

1. The vehicle-mounted scattered natural gas liquefaction system comprises a carrier (1), a storage tank (2), a low-temperature heat exchanger (3) and a gas-liquid separator (4), and is characterized in that a fluid pretreatment device is arranged at the inlet of the low-temperature heat exchanger (3), the fluid pretreatment device comprises a buffering steady-flow mechanism, a throttling adjusting mechanism and a flow equalization distribution assembly, and a heat exchange core body (10) is fixedly arranged above the flow equalization distribution assembly; the buffering steady flow mechanism comprises a buffer (9) internally provided with a turbine rotor, so that kinetic energy dissipation and primary steady flow are carried out on incoming flow; The throttle regulating mechanism is a venturi tube (15) with a floating body regulating part at the throat part so as to realize the automatic regulation of the fluid flow; The flow equalizing distribution assembly comprises a conical distributor (12) and a damping flow equalizing plate (11), wherein a plurality of flow equalizing holes (25) are formed in the conical surface of the conical distributor (12), a plurality of bending holes (13) are formed in the damping flow equalizing plate (11), and the damping flow equalizing plate is used for converting upstream fluctuation gas-liquid two-phase flow into fluid with uniform flow velocity, pressure and temperature distribution and inputting the fluid into the heat exchange core (10).
2. The vehicle-mounted scattered natural gas liquefaction system according to claim 1, wherein the buffer (9) is fixedly arranged on the bottom surface of the cryogenic heat exchanger (3), the venturi tube (15) is fixedly arranged on the top surface of the inner wall of the cryogenic heat exchanger (3), the conical distributor (12) is fixedly arranged above the venturi tube (15), and the damping flow equalizing plate (11) is fixedly arranged on the upper surface of the conical distributor (12).
3. The vehicle-mounted scattered natural gas liquefaction system according to claim 1, wherein the turbine rotor comprises a rotating rod (28) and a plurality of vortex blades (29) fixedly arranged on the periphery of the rotating rod (28), a plurality of connecting plates (26) are fixedly arranged on the periphery of the inner wall of the buffer (9), one end of each connecting plate (26) is fixedly connected with a steady flow cone (27), and the upper end of each rotating rod (28) is rotationally connected with the corresponding steady flow cone (27).
4. The vehicle-mounted scattered natural gas liquefaction system according to claim 1, wherein the floating body adjusting component comprises a limiting frame (16) fixedly arranged at the throat part of the venturi tube (15), a first pull rope (17) fixedly arranged on the limiting frame (16) and a floating ball (18) fixedly arranged at one end of the first pull rope (17).
5. The vehicle-mounted scattered natural gas liquefaction system according to claim 4, wherein the throttling adjusting mechanism is further connected with a safety relief assembly, and the safety relief assembly comprises a relief opening formed in the wall of the venturi tube (15), a valve plug (23) for blocking the relief opening and a linkage mechanism for connecting the valve plug (23) with the floating ball (18).
6. The vehicle-mounted scattered natural gas liquefaction system according to claim 5, wherein the linkage mechanism comprises a second pull rope (19), a guide rod (20), a spring (21) and an arc plate (22), two ends of the second pull rope (19) are fixedly connected with the floating ball (18) and the arc plate (22) respectively, the arc plate (22) is slidably sleeved on the guide rod (20), the valve plug (23) is fixedly connected with the arc plate (22), the spring (21) acts on the arc plate (22) to provide pressure for keeping a blocking release opening for the valve plug (23).
7. The vehicle-mounted scattered natural gas liquefaction system according to claim 6, wherein the storage tank (2), the cryogenic heat exchanger (3) and the gas-liquid separator (4) form a liquefaction process loop through pipeline connection, a second connecting pipe (6) is fixedly connected to the bottom surface of the buffer (9), a first connecting pipe (5) is fixedly connected to the storage tank (2), a third connecting pipe (7) is fixedly connected to the gas-liquid separator (4), a communicating pipe (8) is fixedly connected to one end of the first connecting pipe (5), and one ends of the second connecting pipe (6) and the third connecting pipe (7) are fixedly connected with the communicating pipe (8).
8. The vehicle-mounted scattered natural gas liquefaction system according to claim 1, wherein a reinforcing ring (14) is fixedly arranged on the periphery of the cryogenic heat exchanger (3).

Description

Vehicle-mounted scattered natural gas liquefaction system Technical Field The invention belongs to the technical field of natural gas liquefaction, and particularly relates to a vehicle-mounted scattered natural gas liquefaction system. Background The vehicle-mounted mobile natural gas liquefaction device is key equipment for realizing recycling of the marginal gas field and scattered wellhead gas resources. Existing such devices typically include a compression purification unit, a cryogenic liquefaction unit (core primary cryogenic heat exchanger), a gas-liquid separation unit, and a Liquefied Natural Gas (LNG) storage tank mounted on a transport vehicle. The technological process includes compressing and purifying the material gas, cooling and liquefying the material gas directly or via simple pipeline to obtain liquefied gas-liquid mixture, separating the liquefied gas-liquid mixture, and storing the liquefied gas in the storage tank. However, in practical application, the prior art scheme has the obvious defects that firstly, an effective pretreatment structure is lacking at an inlet of a main low-temperature heat exchanger, the fluctuation of an upstream air source directly impacts a heat exchange core body to cause uneven flow field distribution, local bias flow or dead zone is easy to form, heat exchange efficiency and liquefaction capacity are seriously reduced, and secondly, trace moisture and heavy hydrocarbon in natural gas are easy to form hydrate or wax precipitation at a throttling part (such as a throttling valve with a fixed aperture) under a low-temperature working condition, so that a flow channel is blocked and frequent shutdown treatment is needed, and the vehicle-mounted scattered natural gas liquefaction system is provided for solving the problems. Disclosure of Invention The invention aims to provide a vehicle-mounted scattered natural gas liquefaction system, which solves the problems set forth in the background technology. In order to solve the technical problems, the invention is realized by the following technical scheme: The invention relates to a vehicle-mounted scattered natural gas liquefaction system which comprises a carrier, a storage tank, a low-temperature heat exchanger and a gas-liquid separator, wherein a fluid pretreatment device is arranged at the inlet of the low-temperature heat exchanger, the fluid pretreatment device comprises a buffering steady flow mechanism, a throttling adjusting mechanism and a flow equalizing distribution assembly, a heat exchange core body is fixedly arranged above the flow equalizing distribution assembly, the buffering steady flow mechanism comprises a buffer, a turbine rotor is arranged in the buffer, the throttling adjusting mechanism is a venturi tube, a floating body adjusting part is arranged at the throat part of the venturi tube, the flow equalizing distribution assembly comprises a conical distributor and a damping flow equalizing plate, a plurality of flow dividing holes are formed in the conical surface of the conical distributor, and a plurality of bending holes are formed in the damping flow equalizing plate and are used for converting gas-liquid two-phase flow fluctuated upstream into fluid with uniform flow speed, pressure and temperature distribution and high-uniformity and inputting the fluid into the heat exchange core body. Preferably, the buffer is fixedly arranged on the bottom surface of the low-temperature heat exchanger, the venturi tube is fixedly arranged on the top surface of the inner wall of the low-temperature heat exchanger, the conical distributor is fixedly arranged above the venturi tube, and the damping flow equalizing plate is fixedly arranged on the upper surface of the conical distributor. Preferably, the turbine rotor comprises a rotating rod and a plurality of vortex blades fixedly arranged on the periphery of the rotating rod, a plurality of connecting plates are fixedly arranged on the periphery of the inner wall of the buffer, one end of each connecting plate is fixedly connected with a steady flow cone, and the upper end of the rotating rod is rotationally connected with the steady flow cone. Preferably, the floating body adjusting component comprises a limiting frame fixedly arranged at the throat part of the venturi tube, a first pull rope fixed on the limiting frame and a floating ball fixed at one end of the first pull rope. Preferably, the throttle adjusting mechanism is further connected with a safety release assembly, and the safety release assembly comprises a release opening formed in the wall of the venturi tube, a valve plug for blocking the release opening and a linkage mechanism for connecting the valve plug and the floating ball. Preferably, the linkage mechanism comprises a second stay cord, a guide rod, a spring and an arc plate, wherein two ends of the second stay cord are fixedly connected with the floating ball and the arc plate respectively, the arc plate is slidably sleeved