Flash steam condensation recovery device of LNG storage tank

Abstract

The utility model discloses an LNG (Liquefied Natural Gas) storage tank flash steam condensation recovery device, which relates to the technical field of LNG treatment and comprises a base, one end of the top of the base is fixedly connected with a supporting bin, the top of the supporting bin is fixedly connected with a pre-cooling bin, and the input end and the output end of the pre-cooling bin are fixedly connected with first electric valves. One end of the first electric valve at the output end is fixedly connected with a filtering and separating device, and the output end of the filtering and separating device is fixedly connected with a connecting pipe. According to the base, on the basis that BOG is efficiently condensed and recycled, the supercharger is protected through the buffering mechanism in the treatment process, and therefore the problems that the recycling efficiency is low due to the fact that an existing LNG storage tank is lack of integrated equipment during condensation and recycling of flash steam, the buffering mechanism is lacked in the treatment process, and the recycling efficiency is poor are solved. The BOG airflow is easy to impact and damage the supercharger.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of LNG processing technology, specifically relates to a LNG storage tank flash steam condensation recovery device. BACKGROUND

[0002] Due to the great temperature difference between it and the environment, the heat absorption evaporation of LNG always exists in the storage and transportation process, and the generation of BOG (the gas naturally heat absorption evaporated in the storage, transportation and other processes of LNG) is inevitable. When the LNG storage and transportation pressure reaches a certain pressure, it is generally unloaded by automatic or manual atmospheric emission, and the BOG is treated by condensation for secondary utilization.

[0003] In the existing LNG storage tank flash steam treatment process, most of them lack an integrated device specially designed for efficient condensation recovery, and usually use multiple scattered devices, which leads to low overall processing efficiency, lack of reasonable connection and cooperation between each processing link, energy loss when the flash steam flows between devices, long recovery cycle, and inability to meet the demand for efficient treatment of flash steam in large-scale LNG storage facilities. In the flash steam condensation and pressurization process, the impact force of BOG gas flow is easy to damage the booster, and there is a lack of effective buffering and protection measures. For example, the liquid droplets or impurities carried in the BOG will impact the key components such as blades and seals inside the booster under the drive of high-speed airflow, causing component wear and deformation in a short time, not only reducing the working efficiency of the booster, but also greatly shortening its service life, increasing equipment maintenance cost and downtime risk. UTILITY MODEL CONTENTS

[0004] In view of the above problems existing in the prior art LNG storage tank flash steam condensation recovery device, the utility model is proposed.

[0005] Therefore, the utility model aims to provide a LNG storage tank flash steam condensation recovery device, which solves the problem of lack of integrated equipment in the condensation recovery of the existing LNG storage tank flash steam, resulting in low recovery processing efficiency, and lack of buffering mechanism in the processing process, which causes damage to the booster by BOG gas flow.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] A LNG storage tank flash steam condensation recovery device, comprising a base, the top of the base is fixedly connected with a supporting bin, the top of the supporting bin is fixedly connected with a precooling bin, the input end and the output end of the precooling bin are fixedly connected with first electric valves, the first electric valve at the output end is fixedly connected with a filter separation device at one end, and the output end of the filter separation device is fixedly connected with a connecting pipe;

[0008] The other end of the top of the supporting bin is fixedly connected with a condensing bin, the connecting pipe and the condensing bin are fixedly connected with compressors through buffering mechanisms, the connecting pipe is fixedly connected with the input end of the compressor through the buffering mechanism, the condensing bin is fixedly connected with the output end of the compressor through the buffering mechanism, one end of the condensing bin is fixedly connected with a gas-liquid separation device, the bottom of the gas-liquid separation device is fixedly connected with a second electric valve, the cavity of the supporting bin is provided with a power supply mechanism, the cavity of the pre-cooling bin is fixedly connected with a cooling grid plate, the cavity of the condensing bin is fixedly connected with a spiral condensing plate, and the outer wall of the condensing bin is fixedly connected with a cooling jacket.

[0009] Preferably, the buffering mechanism comprises buffering bins and spiral buffering cavities, the output end and the input end of the compressor are fixedly connected with buffering bins, and the cavities of the buffering bins at both ends are provided with spiral buffering cavities, and the other ends of the buffering bins at both ends are fixedly connected with the connecting pipe and the condensing bin.

[0010] Preferably, the power supply mechanism comprises a cooling fan, a hose, an air inlet connecting plate and an air outlet connecting plate, the cavity of the supporting bin is fixedly connected with a cooling fan, the output ends of the cooling fan at both ends are fixedly connected with a hose, the top of the condensing bin is fixedly connected with an air inlet connecting plate and an air outlet connecting plate, the input ends of the spiral condensing plate and the cooling jacket are fixedly connected with the bottom of the air inlet connecting plate at both ends, the output ends of the spiral condensing plate and the cooling jacket are fixedly connected with the bottom of the air outlet connecting plate at both ends, and the other ends of the hoses at both ends are fixedly connected with the input ends of the cooling grid plate and the air inlet connecting plate.

[0011] Preferably, the cavity of the filtering and separating device is fixedly connected with an output pipe at the top, a first gas-liquid separation membrane is fixedly connected between the pipe wall of the output pipe and the inner side wall of the filtering and separating device, a filter screen is fixedly connected to one end of the cavity of the filtering and separating device, and a third electric valve is fixedly connected to the bottom of the filtering and separating device.

[0012] Further, the top of the gas-liquid separation device is fixedly connected with an air outlet connecting end, and a second gas-liquid separation membrane is fixedly connected between the inner side walls of the gas-liquid separation device.

[0013] Preferably, the output ends of the cooling grid plate and the air outlet connecting plate are fixedly connected with discharge connecting pipes.

[0014] In the above technical scheme, the technical effects and advantages of the present application are provided.

[0015] 1. The utility model discloses, utilize the precooling bin, filter separation device, compressor, condensing bin and gas-liquid separation device set up, through compact layout, flash gas recovery process high degree of integration cold, but grid plate precooling, filter separation device removes impurity and removes water, makes subsequent compression and condensation more efficient, reduces intermediate link and energy loss, significantly improves recovery processing efficiency.

[0016] 2. The utility model discloses, utilize the buffer mechanism that is set up by buffer bin and spiral buffer chamber at the both ends of compressor, can effectively buffer the unstable impact of BOG gas flow, when the flash steam flow or pressure fluctuation, spiral buffer chamber absorbs and adjusts fluctuation, ensures that the airflow that enters the compressor is stable, avoids its damage due to instantaneous high flow impact, prolongs the service life of compressor.

[0017] 3. The utility model discloses, utilize the first gas-liquid separation membrane of filter separation device chamber and the second gas-liquid separation membrane in gas-liquid separation device chamber, carry out multistage gas-liquid separation to flash gas respectively, filter screen filters impurity simultaneously, separates out the non-liquefiable gas accurately and discharges, utilize the energy supply mechanism that is set up by air cooler, hose, air inlet connecting plate and air outlet connecting plate, supplies energy for cooling grid plate, spiral condensing plate and cooling jacket, realizes cold gas recycling, improves energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the utility model, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0019] Figure 1 It is the front view schematic diagram of the utility model;

[0020] Figure 2 It is the front view schematic diagram of the utility model;

[0021] Figure 3 It is the spiral condensing plate three-dimensional schematic diagram of the utility model.

[0022] Mark explanation:

[0023] 1, base; 2, support bin; 3, pre-cooling bin; 4, first electric valve; 5, filter separation device; 6, connecting pipe; 7, condensing bin; 8, compressor; 9, gas-liquid separation device; 10, second electric valve; 11, cooling grid plate; 12, spiral condensing plate; 13, cooling jacket; 14, buffer bin; 15, spiral buffer cavity; 16, cold air machine; 17, hose; 18, air inlet connecting plate; 19, air outlet connecting plate; 20, output pipe; 21, first gas-liquid separation membrane; 22, filter screen; 23, third electric valve; 24, exhaust connection end; 25, second gas-liquid separation membrane; 26, exhaust connecting pipe. DETAILED DESCRIPTION

[0024] In order for those skilled in the art to better understand the technical scheme of the utility model, the utility model will be further described in detail below in combination with the drawings.

[0025] The utility model discloses a LNG storage tank flash steam condensation recovery device.

[0026] The utility model provides a kind of LNG storage tank flash steam condensation recovery device as Figures 1-3 As shown in figure 1, a kind of LNG storage tank flash steam condensation recovery device is provided, including base 1, the top one end of base 1 is fixedly connected with support bin 2, the top of support bin 2 is fixedly connected with pre-cooling bin 3, the input end and output end of pre-cooling bin 3 are all fixedly connected with first electric valve 4, wherein the first electric valve 4 of output end is fixedly connected with filter separation device 5 in one end, the output end of filter separation device 5 is fixedly connected with connecting pipe 6;

[0027] A condenser 7 is fixedly connected to the top of the support chamber 2. Both the connecting pipe 6 and the other end of the condenser 7 are fixedly connected to a compressor 8 via a buffer mechanism. The connecting pipe 6 is fixedly connected to the input end of the compressor 8 via the buffer mechanism, and the condenser 7 is fixedly connected to the output end of the compressor 8 via the buffer mechanism. A gas-liquid separator 9 is fixedly connected to one end of the condenser 7, and a second electric valve 10 is fixedly connected to the bottom of the gas-liquid separator 9. A power supply mechanism is installed inside the cavity of the support chamber 2. A cooling grid plate 11 is fixedly connected inside the cavity of the precooling chamber 3, and a spiral condensing plate 12 is fixedly connected inside the cavity of the condenser 7. A cooling jacket 13 is fixedly connected to the outer wall of the condenser 7. Using the precooling chamber 3, flash vapor flows sequentially through the filter separation device 5, compressor 8, condenser 7, and gas-liquid separator 9. The entire process is completed within a compact system, reducing connecting pipes and intermediate links, lowering energy loss and leakage risk. The cooling grid plate 11 placed in the pre-cooling chamber 3 can initially cool the flash vapor, reducing the burden on subsequent condensation. The filter separation device 5 can remove impurities and moisture in time, optimize the subsequent compression and condensation effect, make the recovery process smoother, and significantly improve efficiency. The buffer mechanism set at the connection points at both ends of the compressor 8 can effectively buffer the unstable impact of BOG airflow. When the flash vapor flow or pressure fluctuates, the buffer mechanism can absorb and regulate the fluctuations to ensure that the airflow entering the compressor 8 is stable and avoid damage to the compressor 8 due to instantaneous high flow impact. With the help of the power supply mechanism, the spiral condensing plate 12 and the cooling jacket 13 are used to perform the final condensation of the flash vapor, condensing the gas into liquid. This solves the problem that the existing LNG storage tank flash vapor lacks integrated equipment for condensation and recovery, resulting in low recovery efficiency and the lack of a buffer mechanism during the process, which makes the BOG airflow easy to impact and damage the booster compressor.

[0028] To avoid damaging compressor 8, such as Figure 1 and 2 As shown, the buffer mechanism includes a buffer chamber 14 and a spiral buffer chamber 15. Both the output and input ends of the compressor 8 are fixedly connected to the buffer chamber 14. The spiral buffer chamber 15 is opened in the cavity of both buffer chambers 14. The other ends of the buffer chambers 14 are fixedly connected to the connecting pipe 6 and the condensing chamber 7, respectively. By using the buffer mechanism composed of the buffer chamber 14 and the spiral buffer chamber 15, the water flash vapor is buffered by the spiral buffer chamber 15 in the cavity of the buffer chamber 14 before entering the compressor 8. After compression, it is buffered again by the spiral buffer chamber 15 before being discharged into the condensing chamber 7. The buffer mechanism reduces the impact of the gas and avoids damage to the compressor 8.

[0029] To provide energy circulation for the cooling grid plate 11, the spiral condenser plate 12, and the cooling jacket 13, such as Figure 1 and 2As shown, the energy supply mechanism includes the air cooler 16, the hose 17, the air inlet connecting plate 18 and the air outlet connecting plate 19, the air cooler 16 is fixedly connected in the cavity of the supporting bin 2, both ends of the air cooler 16 are fixedly connected with the hose 17, the air inlet connecting plate 18 and the air outlet connecting plate 19 are fixedly connected at the top of the condensing bin 7, the bottom of the air inlet connecting plate 18 is fixedly connected with the input end of the spiral condensing plate 12 and the cooling jacket 13 respectively, the bottom of the air outlet connecting plate 19 is fixedly connected with the output end of the spiral condensing plate 12 and the cooling jacket 13 respectively, the other ends of the two-end hose 17 are fixedly connected with the input end of the cooling grid plate 11 and the air inlet connecting plate 18 respectively, the energy supply mechanism composed of the air cooler 16, the hose 17, the air inlet connecting plate 18 and the air outlet connecting plate 19 is arranged, cold air generated by the air cooler 16 meeting the condensing temperature requirement is sent into the cooling grid plate 11 and the air inlet connecting plate 18 through the two-end hose 17, the air inlet connecting plate 18 is arranged to send the cold air into the spiral condensing plate 12 and the cooling jacket 13 respectively, and the air outlet connecting plate 19 is arranged to discharge the heat-exchanged cold air through the connecting pipeline.

[0030] In order to filter and separate the impurities in the flash gas, as shown, Figure 2 As shown, the output pipe 20 is fixedly connected at the top in the cavity of the filter separation device 5, the first gas-liquid separation membrane 21 is fixedly connected between the pipe wall of the output pipe 20 and the inner side wall of the filter separation device 5, the filter screen 22 is fixedly connected at one end in the cavity of the filter separation device 5, and the third electric valve 23 is fixedly connected at the bottom of the filter separation device 5, the output pipe 20 is arranged to discharge the pre-cooled flash gas into the filter separation device 5, the first gas-liquid separation membrane 21 is arranged to perform gas-liquid separation, and the filter screen 22 is arranged to filter the impurities in the flash gas.

[0031] In order to separate and discharge the gas which cannot be liquefied without natural gas, as shown, Figure 1 and 2 As shown, the gas discharge connecting end 24 is fixedly connected at the top of the gas-liquid separation device 9, and the second gas-liquid separation membrane 25 is fixedly connected between the inner side walls of the gas-liquid separation device 9, the gas discharge connecting end 24 is arranged to facilitate the connection pipeline to discharge the gas which cannot be liquefied without natural gas after condensation, and the second gas-liquid separation membrane 25 is arranged to finally separate the flash gas after condensation and separate the gas which cannot be liquefied without natural gas.

[0032] In order to facilitate the connection pipeline to discharge the heat-exchanged cold air, as shown, Figure 1 and 2 As shown, the discharge connecting pipe 26 is fixedly connected with the output end of the cooling grid plate 11 and the air outlet connecting plate 19, and the discharge connecting pipe 26 is arranged to facilitate the connection pipeline to discharge the heat-exchanged cold air.

[0033] Certain exemplary embodiments of this application are described herein by way of illustration, and not limitation, and it is to be understood that the application can be carried out by using various means, compositions, and techniques and by taking many possible technical paths, all without departing from the spirit and scope of the application. Accordingly, the drawings and descriptions are to be regarded as illustrative in nature, and not as restrictive.

Claims

1. A LNG storage tank flash vapor condensation recovery device comprising a base (1), characterized in that, The top end of the base (1) is fixedly connected with a support bin (2), the top of the support bin (2) is fixedly connected with a pre-cooling bin (3), the input end and the output end of the pre-cooling bin (3) are fixedly connected with first electric valves (4), one end of the first electric valve (4) at the output end is fixedly connected with a filter separation device (5), and the output end of the filter separation device (5) is fixedly connected with a connecting pipe (6). The top of the other end of the support bin (2) is fixedly connected with a condensation bin (7), the other end of the connecting pipe (6) and the condensation bin (7) are fixedly connected with a compressor (8) through a buffer mechanism, the connecting pipe (6) is fixedly connected with the input end of the compressor (8) through the buffer mechanism, the condensation bin (7) is fixedly connected with the output end of the compressor (8) through the buffer mechanism, one end of the condensation bin (7) is fixedly connected with a gas-liquid separation device (9), the bottom of the gas-liquid separation device (9) is fixedly connected with a second electric valve (10), the cavity of the support bin (2) is provided with a power supply mechanism, the cavity of the pre-cooling bin (3) is fixedly connected with a cooling grid plate (11), the cavity of the condensation bin (7) is fixedly connected with a spiral condensation plate (12), and the outer wall of the condensation bin (7) is fixedly connected with a cooling jacket (13).

2. The LNG storage tank flash vapor condensing and recovering device according to claim 1, characterized in that, The buffer mechanism comprises buffer bins (14) and spiral buffer cavities (15), the output end and the input end of the compressor (8) are fixedly connected with the buffer bins (14), the cavities of the buffer bins (14) at both ends are provided with the spiral buffer cavities (15), and the other ends of the buffer bins (14) at both ends are fixedly connected with the connecting pipe (6) and the condensation bin (7) respectively.

3. The LNG storage tank flash vapor condensing and recovering device according to claim 1, characterized in that, The power supply mechanism comprises air coolers (16), hoses (17), air inlet connecting plates (18) and air outlet connecting plates (19), the cavity of the support bin (2) is fixedly connected with the air coolers (16), the two output ends of the air coolers (16) are fixedly connected with the hoses (17), the top of the condensation bin (7) is fixedly connected with the air inlet connecting plates (18) and the air outlet connecting plates (19), the bottom of the air inlet connecting plate (18) is fixedly connected with the input end of the spiral condensation plate (12) and the cooling jacket (13) respectively, the bottom of the air outlet connecting plate (19) is fixedly connected with the output end of the spiral condensation plate (12) and the cooling jacket (13) respectively, and the other ends of the hoses (17) at both ends are fixedly connected with the input end of the cooling grid plate (11) and the air inlet connecting plate (18) respectively.

4. The LNG storage tank flash vapor condensing and recovering device according to claim 1, characterized in that, The top of the cavity of the filter separation device (5) is fixedly connected with an output pipe (20), the first gas-liquid separation membrane (21) is fixedly connected between the pipe wall of the output pipe (20) and the inner side wall of the filter separation device (5), one end of the cavity of the filter separation device (5) is fixedly connected with a filter screen (22), and the bottom of the filter separation device (5) is fixedly connected with a third electric valve (23).

5. The LNG storage tank flash vapor condensing recovery apparatus according to claim 1, wherein, The top of the gas-liquid separation device (9) is fixedly connected with an exhaust connecting end (24), and the second gas-liquid separation membrane (25) is fixedly connected between the inner side walls of the gas-liquid separation device (9). The top of the gas-liquid separation device (9) is fixedly connected with an exhaust connecting end (24), and the second gas-liquid separation membrane (25) is fixedly connected between the inner side walls of the gas-liquid separation device (9).

6. The LNG storage tank flash vapor condensing and recovering device according to claim 1, characterized in that, The cooling grid plate (11) and the output end of the air outlet connecting plate (19) are fixedly connected with a discharge connecting pipe (26).

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