CN204201473U - A kind of BOG of LNG landing stage formula gas station reclaims power generation system - Google Patents

Abstract

The utility model discloses a BOG recovery power generation system of an LNG pontoon type gas filling station, which belongs to the technical field of LNG. The BOG recovery and power generation system of the LNG pontoon type gas filling station of the utility model includes an air temperature heat exchanger, an electric hot water bath heat exchanger, a pressure regulating mechanism, a buffer mechanism and an interlocking mechanism connected in series in sequence; The warm heat exchanger is connected to the LNG filling storage tank, the interlock mechanism is connected to the generator port, and a water bath heat exchanger mechanism is connected in parallel between the air temperature heat exchanger and the pressure regulating mechanism. The BOG recovery and power generation system of the LNG pontoon type gas filling station of the utility model mainly solves the problem of recovery and reuse of the BOG of the LNG storage tank, improves economic benefits, reduces unnecessary waste, and has high self-safety and safe and reliable operation. , Automatic or manual control can be realized, remote monitoring is possible, and there is no need to care about the release and waste of BOG after input.

Description

A BOG recovery power generation system for LNG pontoon filling station

technical field

The utility model relates to the technical field of LNG, in particular to a power generation system on an LNG pontoon type filling station.

Background technique

As the country's environmental pollution is becoming more and more serious, LNG, as a green and clean energy, has developed rapidly. Especially under the promotion of laws, regulations and related policies, marine LNG-powered ships have emerged as the times require. Early LNG in foreign countries and China Power ships rely on tank trucks on land for fuel replenishment, which is neither safe nor economical, and there are no relevant laws and regulations to support it. With the development of the industry, filling stations such as LNG barges have risen rapidly. The marine storage tank is used as a temporary storage device for fuel. Due to its own vacuum degree (objective) and the characteristics of LNG, the storage tank LNG has an indefinite amount of BOG release. Considering the long-term operation of the station, the release amount is relatively large. The commonly used treatment method for existing GOB is: when the overpressure of the storage tank reaches the take-off pressure of the safety valve, after the safety valve takes off, it is directly discharged into the air after passing through the stainless steel pipe, the vaporizer, and the flame arrester, which has poor economic effect and is harmful to the environment. Great harm.

Utility model content

The purpose of the invention of the utility model is to provide a BOG recovery and power generation system for an LNG pontoon filling station in view of the above-mentioned problems, which mainly solves the problem of the release and reuse of BOG in LNG storage tanks, improves economic benefits, and reduces unnecessary It has high safety, safe and reliable operation, automatic or manual control, remote monitoring, and no need to care about the waste of BOG after it is put into use.

The technical scheme that the utility model adopts is as follows:

The BOG recovery and power generation system of the LNG pontoon type gas filling station of the utility model includes an air-temperature vaporizer, a pressure regulating mechanism, a buffer mechanism and an interlocking mechanism connected in series in sequence; wherein the air-temperature vaporizer is connected to the LNG liquid storage On the tank, the interlock mechanism is connected to the generator port, and a water-bath vaporizer mechanism is connected in series between the air-temperature vaporizer and the pressure regulating mechanism.

Due to the adoption of the above structure, the air-temperature vaporizer vaporizes the LNG at the front end, turning LNG into low-temperature CNG gas; the water-bath vaporizer heats up the low-temperature CNG to meet the temperature requirements of the output CNG; the pressure regulating mechanism can be Set and maintain the gas pressure in the buffer tank. The buffer mechanism plays a role in stabilizing the outlet pressure. The interlocking mechanism protects the whole device and the generator.

In the BOG recovery power generation system of the LNG pontoon type filling station of the present invention, the air-temperature vaporizer is connected to the LNG liquid storage tank through the GOB release pipeline, and the GOB release pipeline is connected with a flange connection pipeline and EAG release pipeline; The GOB release pipeline is equipped with safety and detection devices.

Due to the adoption of the above structure, the air-temperature vaporizer can vaporize the LNG input from the LNG liquid storage tank, and turn the LNG in it into low-temperature CNG gas. The safety and detection devices in it ensure the safety of the entire recycling system .

The BOG recovery power generation system of the LNG pontoon type gas filling station of the utility model, the water bath type heat exchanger mechanism includes a water bath container filled with water, the air inlet pipe of the water bath container is connected to the air temperature heat exchanger, and the The air outlet pipe of the water-bath container is connected to the pressure regulating mechanism, and the water-bath container is also connected with a water inlet pipe and a water outlet pipe.

Due to the adoption of the above structure, under extreme conditions, by automatically detecting the temperature of CNG, when the temperature is lower than the set condition, the water bath container in the water bath heat exchanger will increase the temperature of the low temperature CNG to reach the output CNG temperature requirements, so that it can be used for the normal use of subsequent generator sets to generate electricity, and avoid damage to the generator set caused by low-temperature gas.

In the BOG recovery power generation system of the LNG pontoon type gas filling station of the utility model, the buffer mechanism includes a buffer tank, and the buffer tank is respectively connected to the pressure regulating mechanism and the interlock mechanism through stainless steel steel pipes. A discharge pipeline and an exhaust pipe are also connected, and a shut-off valve and a safety valve are arranged on the discharge pipeline.

Due to the adoption of the above structure, the buffer tank in the buffer mechanism can accommodate gas and play a buffer role, and finally stabilize the outlet pressure to ensure the normal and stable operation of the generator.

In the BOG recovery power generation system of the LNG pontoon type gas filling station of the utility model, the interlocking mechanism includes three pipelines intersecting at one point, among which three pipelines are equipped with pneumatic valves, one of which is connected to the buffer mechanism, and one The pipeline is connected to the generator port, and the other pipeline is provided with a discharge port.

Due to the adoption of the above structure, the interlocking mechanism protects the entire device and the generator. Pneumatic valve) is interlocked, when the lower part is closed, the upper pneumatic valve is automatically opened. In this way, when the gas supply is normal, the vent is closed; when the vent is opened, the gas will not be supplied normally, so the effect of interlock is realized, which can protect the whole device and the generator.

In the BOG recovery power generation system of the LNG pontoon type gas filling station of the utility model, the pressure regulating mechanism includes two pipelines connected in parallel, one of which is provided with a stop valve and a pressure gauge; the other pipeline is provided with a pressure regulator Ball valves and pressure gauges are installed at both ends of the pipeline.

Due to the above structure, the pressure regulating valve in the pressure regulating mechanism can adjust the gas pressure in the whole management, so as to set and maintain the gas pressure in the buffer tank, and the pressure gauge is convenient for the operator to adjust and control.

In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

The BOG recovery and power generation system of the LNG pontoon type gas filling station of the utility model mainly solves the problem of the release and reuse of the BOG of the LNG storage tank, improves economic benefits, reduces unnecessary waste, and has high self-safety and safe and reliable operation. , Automatic or manual control can be realized, remote monitoring is possible, and there is no need to care about the release and waste of BOG after input.

Description of drawings

Fig. 1 is a schematic diagram of the BOG recovery power generation system of the present invention.

Marks in the figure: 1-LNG liquid storage tank, 2-water bath vaporizer mechanism, 3-pressure regulating mechanism, 4-buffer mechanism, 5-interlock mechanism, 6-GOB release pipeline, 7-stainless steel pipe, 8- Air temperature carburetor, 9-stop valve, 10-pneumatic valve, 11-check valve, D-generator port, F-flange interface, S-living water pipe.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In the utility model, the daily evaporation rate of the LNG storage tank is about 0.15%. If this part of the evaporated gas (referred to as BOG) is not discharged in time, the pressure of the storage tank will increase. For this reason, a pressure-reducing regulating valve is set. BOG can be automatically discharged according to the pressure. The BOG evaporated from the storage tank and the BOG unloaded from the tank truck are heated by a BOG heater and then enter the BOG storage tank for storage. When the water bath NG heater is used in winter, BOG can be used as fuel for the hot water boiler, and can enter the pipeline network in summer .

As shown in Figure 1, the BOG recovery power generation system of the LNG pontoon type gas filling station of the present utility model includes an air temperature type carburetor 8, a pressure regulating mechanism 3, a buffer mechanism 4 and an interlocking mechanism 5 connected in series in sequence; The air-temperature vaporizer 8 is connected to the LNG liquid-filling storage tank 1, wherein the air-temperature vaporizer 8 is connected to the LNG liquid-filling storage tank 1 through the GOB release pipeline 6, and the GOB release line 6 is connected to a method The blue connection pipeline and the EAG release pipeline; the EAG release pipeline is two pipelines connected in parallel to the EAG discharge port, one of which is provided with a shut-off valve, and the other is provided with a shut-off valve and a safety valve; the GOB The release pipeline 6 is provided with a safety and detection device. Wherein said water-bath vaporizer mechanism 2 comprises a water-bath container filled with water, the inlet pipe of said water-bath container is connected to air-temperature type vaporizer 8, and the outlet pipe of said water-bath container is connected to pressure regulating mechanism 3, on said water-bath container Also be connected with water inlet pipe and outlet pipe. Wherein the buffer mechanism 4 includes a buffer tank, the buffer tank is respectively connected to the pressure regulating mechanism 3 and the interlock mechanism 5 through a stainless steel steel pipe 7, and the buffer tank is also connected with a release pipeline and an exhaust pipe, A cut-off valve and a safety valve are arranged on the release pipeline. Wherein the interlocking mechanism 5 includes three pipelines intersecting at one point, among which three pipelines are provided with pneumatic valves, one of which is connected to the buffer mechanism 4, one pipeline is connected to the generator port D, and the other pipeline is Set up vents. Wherein said pressure regulating mechanism 3 comprises two pipelines connected in parallel with each other, one of which is provided with a shut-off valve and a pressure gauge; the other pipeline is provided with a pressure regulating valve and a pressure gauge, respectively A ball valve is provided. The interlock mechanism 5 is connected to the generator port D, and a water-bath vaporizer mechanism 2 is connected in parallel between the air-temperature vaporizer 8 and the pressure regulating mechanism 3 . There are necessary safety and detection devices on the pipeline connecting pipelines.

In the BOG recovery power generation system of the LNG pontoon type gas filling station of the utility model, the pressure regulating device adjusts and maintains the gas pressure in the buffer tank. The buffer tank plays a role in stabilizing the outlet pressure. The interlock valve protects the entire device and the generator. The upper pneumatic valve is interlocked with the lower pneumatic valve. When the lower part is closed, the upper pneumatic valve is automatically opened. The air intake, temperature regulation, pressure regulation and interlock of the device can be automatically controlled, and remote monitoring can be carried out if necessary. It mainly solves the problem of BOG release and reuse in LNG storage tanks, improves economic benefits, and reduces unnecessary waste. It has high safety, safe and reliable operation, automatic or manual control, remote monitoring, and no need for Concerned about the release and waste of BOG; the air-temperature vaporizer performs the front-end LNG gasification, and the LNG becomes low-temperature CNG gas. The water-bath evaporator heats up the low-temperature CNG to meet the temperature requirements of the output CNG.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (6)

1. the BOG of LNG landing stage formula gas station reclaims a power generation system, it is characterized in that: it comprises air temperature type heat exchanger (8), pressure-regulating device (3), damping mechanism (4) and the mutual interlocking gear (5) of sequentially connecting; Wherein said air temperature type vaporizer (8) is connected on LNG liquid addition storage tank (1), described mutual interlocking gear (5) is connected to generator mouth (D), is also in series with water-bath type heat exchanger mechanism (2) between described air temperature type heat exchanger (8) and pressure-regulating device (3).

2. the BOG of LNG landing stage formula gas station as claimed in claim 1 reclaims power generation system, it is characterized in that: described air temperature type heat exchanger (8) is connected to the gas-phase space on LNG liquid addition storage tank (1) by GOB reclaim line (6), described GOB reclaim line (6) is connected with Flange joint pipeline and EAG diffuses pipeline; Described GOB diffuses pipeline (6) and is provided with safety and detection device.

3. the BOG of LNG landing stage formula gas station as claimed in claim 1 reclaims power generation system, it is characterized in that: described water-bath type heat exchanger mechanism (2) comprises the water bath containers filling water, the suction tude of described water bath containers is connected to air temperature type heat exchanger (8), the steam outlet pipe of described water bath containers is connected to pressure-regulating device (3), and described water bath containers is also connected with intake pipe and outlet pipe.

4. the BOG of LNG landing stage formula gas station as claimed in claim 1 reclaims power generation system, it is characterized in that: described damping mechanism (4) comprises knock out drum, described knock out drum is connected on pressure-regulating device (3) and mutual interlocking gear (5) by stainless-steel pipe (7), described state knock out drum is also connected with diffuse pipeline and outlet pipe, described in diffuse pipeline and be provided with stop valve and safety valve.

5. the BOG of LNG landing stage formula gas station as claimed in claim 1 reclaims power generation system, it is characterized in that: described mutual interlocking gear (5) comprises three pipelines meeting at a bit, wherein three pipelines are equipped with pneumatic valve, wherein a pipeline is connected to damping mechanism (4), article one, pipeline is connected to generator mouth (D), and another pipeline arranges diffusion mouth.

6. the BOG of LNG landing stage formula gas station as claimed in claim 1 reclaims power generation system, it is characterized in that: described pressure-regulating device (3) comprises two pipelines parallel with one another, wherein a pipeline is provided with stop valve and pressure gauge; Another pipeline is provided with pressure regulator valve and pressure gauge, is respectively arranged with ball valve at the two ends of this pipeline.