Structure-optimized skid-mounted intermediate fluid heat exchange gasifier

Abstract

The utility model discloses a structure optimization type skid-mounted intermediate fluid heat exchange gasifier which comprises an intermediate fluid heater, an LNG primary heater and an LNG secondary heater, an outlet of the LNG primary heater is connected with an outer shell of the LNG secondary heater through a process pipeline, and an NG outlet is formed in the outer shell of the LNG secondary heater. The two ends of the LNG secondary heater are connected with a heating fluid primary inlet pipe and a heating fluid primary outlet pipe respectively, the heating fluid primary outlet pipe is connected to a heating fluid secondary inlet pipe through a pipeline, a skid-mounted structure is adopted, the whole LNG secondary heater is fixedly installed on a platform, and the LNG secondary heater is located above the shell. A structural bracket for supporting the LNG secondary heater is fixed on the platform; and the middle fluid heater adopts a double-elliptical-head structure. The heat exchanger has the advantages that the intermediate medium heat exchanger is of a double-oval-head structure, and manufacturing difficulty is lowered; in order to improve the gasification efficiency, an anti-wave and anti-splashing gas-liquid primary separation component is arranged.

Description

Technical Field

[0001] The utility model relates to the field of LNG receiving station output gasification equipment, which is an LNG gasification and external transmission equipment with intermediate fluid heat exchange. Background Art

[0002] The intermediate fluid type gasifiers currently used in China were basically imported around 2015. In the following years, several companies have carried out domestic research and development. The products developed are basically similar to imported equipment, with almost no improvements in process and equipment structure. The end face of the main equipment still uses a flat cover large tube sheet (such as CN1105849C). With the increase of the diameter of the equipment, the thickness of the flat cover large tube sheet is relatively thick, especially the flat cover large tube sheet is still a half-moon structure at the connection tube box. The irregular structure makes the tube sheet manufacturing very difficult, and the manufacturing cost is greatly increased. There is also a split structure (such as CN205048148U). The advantage of this structure is that the large tube sheet structure is cancelled. There are about 5 connecting pipes between the two cylinders. After the connecting pipe is welded to the equipment, under the action of welding deformation, due to the lack of flexible design, the local stress at the root of the connecting pipe is relatively large. After the equipment has been running for a period of time, defects are likely to occur at the root, affecting the safe operation of the equipment; at the same time, this structure increases the rising space for the intermediate medium and reduces the heat exchange efficiency.

[0003] From the above analysis, there is still much room for optimization in the structure and process design of the intermediate fluid type gasifier. Utility Model Content

[0004] The utility model provides a structure-optimized skid-mounted intermediate fluid gasifier, which optimizes the equipment structure.

[0005] The technical solution of the utility model is as follows: a structure-optimized skid-mounted intermediate fluid heat exchange gasifier, comprising an intermediate fluid heater, an LNG primary heater and an LNG secondary heater. The fluid heat exchange pipes of the intermediate fluid heater and the LNG primary heater are all arranged in the same shell. Both ends of the fluid heat exchange pipe of the intermediate fluid heater pass through the shell and are respectively connected to the heating fluid secondary inlet pipe and the heating fluid secondary outlet pipe tube plate. The inlet and outlet of the LNG primary heater are on the same side of the shell. The fluid heat exchange pipe of the LNG primary heater has a U-shaped bend. The outlet of the LNG primary heater is connected to the LNG secondary heater shell through a process pipeline, and an NG outlet is arranged on the LNG secondary heater shell. Both ends of the LNG secondary heater are respectively connected to the heating fluid primary inlet pipe and the heating fluid primary outlet pipe. The heating fluid primary inlet pipe and the heating fluid primary outlet pipe are connected to the fluid heat exchange pipe of the LNG secondary heater. The heating fluid primary outlet pipe is connected to the heating fluid secondary inlet pipe through a pipeline. A skid-mounted structure is adopted, and the whole is installed and fixed on a platform. The LNG secondary heater is located above the shell, and a structural bracket for supporting the LNG secondary heater is fixed on the platform. The intermediate fluid heater adopts a double elliptical head structure.

[0006] Furthermore, a wave-proof and splash-proof gas-liquid primary separation component is fixed in the shell and is located between the fluid heat exchange tube of the intermediate fluid heater and the fluid heat exchange tube of the LNG first-stage heater and is in the shape of a mesh plate.

[0007] The heat exchange areas of the intermediate fluid heater fluid heat exchange tube, the LNG first-stage heater fluid heat exchange tube, and the LNG second-stage heater fluid heat exchange tube all adopt an outer surface embossing type.

[0008] The process pipeline is provided with a detection instrument.

[0009] A safety valve pipeline is installed on the shell.

[0010] The beneficial effects of the utility model are as follows: the utility model adopts a double elliptical head structure for the intermediate medium heat exchanger, replacing the flat cover large tube plate structure, which greatly reduces the manufacturing difficulty, shortens the manufacturing cycle, and reduces the cost; at the same time, in order to improve the gasification efficiency, a wave-proof and splash-proof gas-liquid initial separation component is arranged on the upper part of the intermediate fluid; the outer surfaces of all heat exchange tubes are embossed to improve the heat exchange efficiency; the overall skid-mounted integration is adopted to reduce the equipment installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of the utility model;

[0012] Figure 2 The outer surface of the heat exchange tube has an embossed structure;

[0013] Figure 3 It is a shape diagram of the wave and splash-proof gas-liquid primary separation component;

[0014] In the figure: 1-intermediate fluid heater, 2-wave and splash-proof gas-liquid primary separation component, 3-LNG primary heater, 4-LNG secondary heater, 5-structural support, 6-process pipeline, 7-detection instrument, 8-safety valve pipeline, 9-shell, 10-heating fluid secondary inlet pipe, 11-heating fluid secondary outflow pipe, 12-NG outlet, 13-heating fluid primary inlet pipe, 14-heating fluid primary outflow pipe, 15-platform. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] A structure-optimized skid-mounted intermediate fluid heat exchange gasifier comprises an intermediate fluid heater 1, an LNG primary heater 3 and an LNG secondary heater 4. The fluid heat exchange tubes of the intermediate fluid heater 1 and the LNG primary heater 3 are arranged in the same shell 9. Both ends of the fluid heat exchange tube of the intermediate fluid heater 1 pass through the shell 9 and are respectively connected to the tube sheets of a heating fluid secondary inlet pipe 10 and a heating fluid secondary outlet pipe 11. The inlet and outlet of the LNG primary heater 3 are on the same side of the shell 9. The fluid heat exchange tube of the LNG primary heater 3 has a U-shaped bend. The outlet of the LNG primary heater 3 is connected to the outer shell of the LNG secondary heater 4 through a process pipeline 6, and an NG outlet 12 is arranged on the shell of the LNG secondary heater 4. Both ends of the LNG secondary heater 4 are respectively connected to a heating fluid primary inlet pipe 13 and a heating fluid primary outlet pipe 14. The heating fluid primary inlet pipe 13 and the heating fluid primary outlet pipe 14 are connected to the fluid heat exchange tube of the LNG secondary heater 4, and the heating fluid primary outlet pipe 14 is connected to the heating fluid secondary inlet pipe 10 through a pipeline.

[0017] The improvements are: a skid-mounted structure is adopted, the whole is installed and fixed on the platform 15, the LNG secondary heater 4 is located above the shell 9, forming a superimposed arrangement, and a structural bracket 5 for supporting the LNG secondary heater 4 is fixed on the platform 15. A detection instrument 7 is provided on the process pipeline 6. A safety valve pipeline 8 is installed on the shell 9. The skid-mounted integration makes the whole compact, the structure reasonable, and convenient for transportation and on-site installation. The LNG secondary heater 4 is superimposed on the intermediate fluid heater 1, making the equipment structure more reasonable, much shorter in length than previous equipment, saving a lot of space, and providing further optimization space for external connection pipelines.

[0018] The intermediate fluid heater 1 adopts a double elliptical head structure, eliminating the large flat cover tube sheet and the crescent-shaped tube box connection structure. Based on the flat cover strength calculation results, in the case of large diameter and high pressure, the thickness of the flat cover is very large. In addition, the special structure of the flat cover causes considerable difficulties for machining. Therefore, the improvement of this structure not only reduces the manufacturing difficulty and shortens the manufacturing cycle, but also greatly reduces the manufacturing cost. A wave-proof and splash-proof gas-liquid initial separation component 2 is fixed in the shell 9, which is located between the fluid heat exchange tube of the intermediate fluid heater 1 and the fluid heat exchange tube of the LNG first-stage heater 3, and is in the shape of a mesh plate. The mesh is used for gas to pass through, and at the same time, it plays a role in preventing waves and splashing for the heated intermediate fluid due to boiling, and also plays a preliminary gas-liquid separation effect, thereby improving the heat exchange efficiency of the upper LNG first-stage heater 3.

[0019] The heat exchange areas of the fluid heat exchange tubes of the intermediate fluid heater 1, the fluid heat exchange tubes of the LNG first-stage heater 3, and the fluid heat exchange tubes of the LNG second-stage heater 4 all adopt an outer surface embossing type, which increases the heat exchange area, improves the heat exchange efficiency, reduces the equipment size while keeping the flow rate unchanged, and reduces the equipment manufacturing cost.

[0020] Fluid flow path: Low-temperature LNG enters from the LNG primary heater 3, absorbs the heat of the intermediate fluid (such as propane, etc.) through the fluid heat exchange tube of the LNG primary heater 3, flows out from the LNG primary heater 3, enters the shell side of the LNG secondary heater 4 through the process pipeline 6, absorbs the heat of the heating fluid, and enters the external transmission process pipeline from the NG outlet 12. The heating fluid (seawater, fresh warm water, ethylene glycol aqueous solution, etc.) enters from the heating fluid primary inlet pipe 13 to perform secondary heating on the NG that has been heated once. The heating fluid that has been cooled comes out from the heating fluid primary outflow pipe 14 and enters the heating fluid secondary inlet pipe 10 through the pipeline. The intermediate fluid is heated in the intermediate fluid heater 1 pipe side, so that the intermediate fluid is vaporized and rises, passes through the wave-proof and splash-proof gas-liquid primary separation component 2, heats the LNG once, and then enters the external connection pipeline through the pipe side outlet heating fluid secondary outflow pipe 11.

Claims

1. A structure-optimized skid-mounted intermediate fluid heat exchange gasifier, comprising an intermediate fluid heater (1), an LNG primary heater (3), and an LNG secondary heater (4); the fluid heat exchange pipes of the intermediate fluid heater (1) and the LNG primary heater (3) are arranged in the same shell (9); both ends of the fluid heat exchange pipe of the intermediate fluid heater (1) pass through the shell (9) and are respectively connected to the tube sheets of the heating fluid secondary inlet pipe (10) and the heating fluid secondary outlet pipe (11); the inlet and outlet of the LNG primary heater (3) are on the same side of the shell (9); the fluid heat exchange pipe of the LNG primary heater (3) The invention has a U-shaped bend, the outlet of the LNG primary heater (3) is connected to the outer shell of the LNG secondary heater (4) through a process pipeline (6), and an NG outlet (12) is provided on the outer shell of the LNG secondary heater (4). The two ends of the LNG secondary heater (4) are respectively connected to a heating fluid primary inlet pipe (13) and a heating fluid primary outlet pipe (14). The heating fluid primary inlet pipe (13) and the heating fluid primary outlet pipe (14) are connected to the fluid heat exchange pipe of the LNG secondary heater (4), and the heating fluid primary outlet pipe (14) is connected to the heating fluid secondary inlet pipe (10) through a pipeline. The invention is characterized in that: A skid-mounted structure is adopted, and the whole is installed and fixed on a platform (15); the LNG secondary heater (4) is located above the shell (9); and a structural bracket (5) for supporting the LNG secondary heater (4) is fixed on the platform (15); the intermediate fluid heater (1) adopts a double elliptical head structure.

2. According to claim 1, the structure-optimized skid-mounted intermediate fluid heat exchange gasifier is characterized by: A wave-proof and splash-proof gas-liquid primary separation component (2) is fixed inside the shell (9) and is located between the fluid heat exchange tube of the intermediate fluid heater (1) and the fluid heat exchange tube of the LNG primary heater (3), and is in the shape of a mesh plate.

3. The structure-optimized skid-mounted intermediate fluid heat exchange gasifier according to claim 1, characterized in that: The heat exchange areas of the fluid heat exchange tubes of the intermediate fluid heater (1), the fluid heat exchange tubes of the LNG primary heater (3), and the fluid heat exchange tubes of the LNG secondary heater (4) all have an outer surface embossed pattern.

4. The structure-optimized skid-mounted intermediate fluid heat exchange gasifier according to claim 1 is characterized by: The process pipeline (6) is provided with a detection instrument (7).

5. The structure-optimized skid-mounted intermediate fluid heat exchange gasifier according to claim 1, characterized in that: A safety valve pipeline (8) is installed on the housing (9).

Images