CN204345957U - BOG cold energy utilization device - Google Patents

Abstract

The utility model discloses a BOG cold energy utilization device, which comprises a heat exchanger, a refrigerant storage tank, a fan coil, a high-pressure gas cooler and a compressor, the BOG input end of the heat exchanger and the BOG on the top of the LNG storage tank. The outlet is connected, the BOG output end of the heat exchanger is connected with the BOG low-temperature channel inlet of the high-pressure gas cooler, the brine input end of the heat exchanger is connected with the brine output end of the fan coil, and the brine of the heat exchanger The outlet of the brine is connected to the inlet of the brine storage tank, and the outlet of the brine storage tank is connected to the brine input of the fan coil through the brine delivery pump; the end of the high-pressure gas cooler is provided with a compressor. It has a simple structure, compact connection and can fully absorb and utilize the cold energy contained in the BOG.

Description

BOG cold energy utilization device

technical field

The utility model relates to a liquefied natural gas energy utilization device, in particular to a BOG cold energy utilization device.

Background technique

Liquefied Natural Gas (LNG for short) is a natural gas that is processed and cooled to about -160°C to store liquid products. It is a clean energy widely used in the world today. Convenient, mature technology and other characteristics, its volume is 1/600 of the gaseous state, which has obvious advantages in storage and transportation.

LNG is usually stored in containers with good heat insulation measures, but the introduction of heat is still unavoidable, resulting in the evaporation of LNG and the generation of BOG (liquefied natural gas flash steam); volume will increase dramatically. At present, there are many ways to deal with BOG. Usually, BOG is compressed by a low-temperature compressor and transported to the pipeline network, or reheated by an air-temperature reheater, compressed by a normal temperature compressor, and then transported to the pipeline network; the cold released by BOG If the amount is not used, it will have an impact on the environment. If the cold energy contained in BOG is recovered and used for cold storage/air conditioning cooling and compressed gas cooling, it will bring significant energy saving and emission reduction benefits.

Contents of the invention

The purpose of the utility model is to provide a BOG cold energy utilization device, which has a simple structure, compact connection, and can fully absorb and utilize the cold energy contained in the BOG.

In order to achieve the above purpose, the BOG cold energy utilization device designed by the utility model includes a heat exchanger, a brine storage tank, a fan coil, a high-pressure gas cooler and a compressor, and its special features are:

The cold medium input end of the heat exchanger is connected with the BOG outlet on the top of the LNG storage tank through the first flow regulating valve, and the cold medium output end of the heat exchanger is connected with the low-temperature channel inlet of the high-pressure gas cooler through the first cut-off valve. The brine input end of the heat exchanger is connected with the brine output end of the fan coil unit, the brine output end of the heat exchanger is connected with the inlet of the brine storage tank, and the outlet of the brine storage tank passes through the brine The delivery pump is connected with the brine input end of the fan coil unit.

The outlet of the low-temperature channel of the high-pressure gas cooler is connected to the inlet of the compressor, the gas outlet of the compressor is connected to the inlet of the high-temperature channel of the high-pressure gas cooler, and the outlet of the high-temperature channel of the high-pressure gas cooler is connected to the LNG gas terminal.

As an optimal solution, a regulating bypass is set between the BOG outlet on the top of the LNG storage tank and the low-temperature channel inlet of the high-pressure gas cooler, and an air-temperature reheater is arranged on the regulating bypass, and the BOG input of the air-temperature reheater The end is connected to the BOG outlet on the top of the LNG storage tank through the second flow regulating valve, and the BOG output end of the air-heated reheater is connected to the low-temperature channel inlet of the high-pressure gas cooler through the second stop valve.

The working principle of the utility model is as follows: adjust the first flow regulating valve and the second flow regulating valve according to the cooling demand, and the low-temperature BOG enters the air-temperature type reheater from the BOG outlet on the top of the LNG storage tank for heating and the heat exchanger and the cold medium Perform heat exchange; then, BOG enters the compressor through the low-temperature channel of the high-pressure gas cooler for pressurization, and the pressurized BOG enters the LNG gas terminal through the high-temperature channel of the high-pressure gas cooler, and the brine is input into the brine The storage tank is then fed into the fan coil unit through the brine delivery pump for heat exchange.

Using the utility model has the following advantages:

First, it is equipped with an adjustable bypass, which can realize the recovery, storage and utilization of BOG cold energy according to the cold demand.

Second, BOG cold energy can be fully utilized in cold storage, air conditioning and high-pressure natural gas cooling, which reduces the impact of BOG reheating on the environment, and at the same time can save the overall energy consumption of the process system, improve energy utilization, and achieve the effect of energy saving and emission reduction .

Description of drawings

Fig. 1 is a schematic diagram of the assembly structure of a BOG cold energy utilization device.

In the figure: LNG storage tank 1; air-heated reheater 2; heat exchanger 3; brine storage tank 4; brine delivery pump 5; fan coil 6; high-pressure gas cooler 7; compressor 8; LNG gas terminal 9; first flow regulating valve 10; second flow regulating valve 11; first stop valve 12; second stop valve 13;

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific examples, but the examples should not be construed as limiting the utility model.

A BOG cold energy utilization device as shown in FIG. 1 includes a heat exchanger 3 , a brine storage tank 4 , a fan coil 6 , a high-pressure gas cooler 7 and a compressor 8 .

The cold medium input end of the heat exchanger 3 is connected to the BOG outlet on the top of the LNG storage tank 1 through the first flow regulating valve 10, and the cold medium output end of the heat exchanger 3 is connected to the low temperature of the high-pressure gas cooler 7 through the first cut-off valve 12. The flow channel inlet is connected, the brine input end of the heat exchanger 3 is connected with the brine output end of the fan coil unit 6, the brine output end of the heat exchanger 3 is connected with the inlet of the brine storage tank 4, and the brine The outlet of the refrigerant storage tank 4 is connected to the brine input end of the fan coil unit 6 through the brine delivery pump 5;

The outlet of the low-temperature channel of the high-pressure gas cooler 7 is connected to the inlet end of the compressor 8, the gas outlet of the compressor 8 is connected to the inlet of the high-temperature channel of the high-pressure gas cooler 7, and the outlet of the high-temperature channel of the high-pressure gas cooler 7 is connected to the LNG Connect with gas terminal 9.

In this technical solution, a regulating bypass 14 is provided between the BOG outlet on the top of the LNG storage tank 1 and the low-temperature flow channel inlet of the high-pressure gas cooler 7, and the regulating bypass 14 is connected with an air-temperature reheater 2, and the air The BOG input end of the warm type reheater 2 is connected to the BOG outlet on the top of the LNG storage tank 1 through the second flow regulating valve 11, and the BOG output end of the air-temperature type reheater 2 is connected to the high-pressure gas cooler through the second cut-off valve 13 7 low temperature runner inlet connected.

When the utility model is working, firstly adjust the first flow regulating valve 10 and the second flow regulating valve 11 according to the cold demand, and the low-temperature BOG enters the air-temperature type reheater 2 for heating and heat exchanger from the BOG outlet at the top of the LNG storage tank 1 3. Exchanging heat with the cold medium; then, the BOG enters the compressor 8 through the low-temperature passage of the high-pressure gas cooler 7 for pressurization, and the pressurized BOG enters the LNG gas terminal 9 through the high-temperature passage of the high-pressure gas cooler 7, The brine is input into the brine storage tank 4 , and then input into the fan coil unit 6 through the brine delivery pump 5 for heat exchange.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (2)

1. a BOG cold energy utilization device, comprises heat exchanger (3), refrigerating medium storage tank (4), fan coil (6), gases at high pressure cooler (7) and compressor (8), it is characterized in that:

The cold medium input of described heat exchanger (3) is exported with the BOG at LNG storage tank (1) top by first flow control valve (10) and is connected, the cold medium output of described heat exchanger (3) is connected with the low temperature flow channel entry point of gases at high pressure cooler (7) by the first stop valve (12), the refrigerating medium input of described heat exchanger (3) is connected with the refrigerating medium output of fan coil (6), the refrigerating medium output of described heat exchanger (3) is connected with the import of refrigerating medium storage tank (4), the outlet of described refrigerating medium storage tank (4) is connected by the refrigerating medium input of refrigerating medium delivery pump (5) with fan coil (6),

The low temperature runner exit of described gases at high pressure cooler (7) is connected with the inlet end of compressor (8), the outlet side of described compressor (8) is connected with the high temperature flow channel entry point of gases at high pressure cooler (7), and the high temperature runner exit of described gases at high pressure cooler (7) is connected with LNG gas consuming device (9).

2. BOG cold energy utilization device according to claim 1, it is characterized in that: be provided with between the BOG outlet at described LNG storage tank (1) top and the low temperature flow channel entry point of gases at high pressure cooler (7) and regulate bypass (14), described adjustment bypass (14) is provided with air temperature type recuperator (2), the BOG input of described air temperature type recuperator (2) is exported with the BOG at LNG storage tank (1) top by second adjustable valve (11) and is connected, the BOG output of described air temperature type recuperator (2) is connected with the BOG low temperature flow channel entry point of gases at high pressure cooler (7) by the second stop valve (13).