阅读说明：本技术 一种lng加注在线调饱和机构及控制方法 (LNG filling online saturation adjusting mechanism and control method ) 是由 黄吉 陈浩 姚三三 唐孝宗 袁林 余波 谭贤财 陈毅 杨顺之 周师强 黄佳 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种LNG加注在线调饱和机构及控制方法,包括去液管线和增气管线；所述增气管线和去液管线之间设置有换热组件,所述增气管线的进液处与去液管线连接,去液管线包括去液进管和去液出管,所述增气管线包括分流进管、分流出管、空温式汽化器和换热器,所述分流进管一端与去液进管连,另一端与空温式汽化器连接和分流出管依次连接,所述换热器与去液管线和分流出管连接,本装置相比常规对储罐整体增温调饱和方式来说,增加了储罐内LNG保存期,减少了BOG蒸发气的排放污染和浪费。(The invention discloses an LNG filling on-line saturation adjusting mechanism and a control method, comprising a liquid removing pipeline and a gas increasing pipeline; the utility model discloses a BOG evaporation gas storage device, including gas pipeline, branch outflow pipe, empty temperature formula vaporizer and heat exchanger, including the branch outflow pipe, the heat exchanger is connected with the liquid inlet pipe, and the branch outflow pipe is connected with the branch outflow pipe, and the heat exchanger is connected with the branch outflow pipe, and the branch outflow pipe is connected with the liquid inlet pipe, and the heat exchanger is connected with the branch outflow pipe, and this device compares the conventionality to the whole saturation mode of heating of storage tank, has increased the interior LNG retention period of storage tank, has reduced BOG evaporation gas's emission pollution and waste.)

1. The utility model provides a saturated mechanism is transferred on line in LNG filling which characterized in that: comprises a liquid conveying pipeline, a gas increasing pipeline and a heat exchanger; the heat exchanger is connected with the liquid conveying pipeline and the gas increasing pipeline, and both the liquid conveying pipeline and the gas increasing pipeline can exchange heat in the heat exchanger; the inlet of the aeration pipeline is connected to the inlet section of the transfusion pipeline.

2. An LNG filling on-line saturation adjusting mechanism according to claim 1, characterized in that: the infusion pipeline is connected with the delivery pump and the liquid phase port of the liquid adding machine; a vaporizer is arranged on the gas increasing pipeline; the gas increasing pipeline penetrates through the heat exchanger and then is connected to the storage tank or the gas increasing pipeline penetrates through the heat exchanger and then is connected to the outlet section of the liquid conveying pipeline.

3. An LNG filling on-line saturation adjusting mechanism according to claim 2, characterized in that: the gas increasing pipeline is provided with an adjusting valve A, and the adjusting valve A is positioned on a pipeline connecting line between the vaporizer and the heat exchanger; be provided with temperature sensor on the liquid removal pipeline, governing valve A and temperature sensor are connected to the controller respectively.

4. An LNG filling on-line saturation adjusting mechanism according to claim 2, characterized in that: when the gas increasing pipeline penetrates through the heat exchanger and is connected to the outlet section of the liquid conveying pipeline, the LNG in the liquid conveying pipeline absorbs heat through the heat exchanger, absorbs heat with the LNG in the gas increasing pipeline through the vaporizer and releases heat through the heat exchanger, and then the LNG and the LNG are gathered to the outlet section of the liquid conveying pipeline; LNG in the gas increasing pipeline is gasified into a gaseous state after absorbing heat through the vaporizer, and is liquefied into a liquid state after releasing heat in the heat exchanger.

5. An LNG filling on-line saturation adjusting mechanism according to claim 2, characterized in that: when the gas increasing pipeline passes through the heat exchanger and then is connected to the storage tank; be connected with the return air pipeline between the gas return port of liquid feeding machine and the storage tank, the gas increase pipeline is including gasification inlet pipe end and gasification outlet pipe end, and wherein gasification inlet pipe end, gasification outlet pipe end connect the vaporizer respectively, gasification inlet pipe end is connected to the induction zone of infusion pipeline, gasification outlet pipe end is connected to the return air pipeline after, the return air pipeline is connected to the storage tank after passing the heat exchanger.

6. An LNG filling on-line saturation adjusting mechanism according to claim 5, characterized in that: and the two ends of the heat exchanger on the air return line are provided with a pressure sensor and an adjusting valve B, the pressure sensor is arranged on an air inlet pipeline connected with a gas phase flow passage of the heat exchanger, the adjusting valve B is arranged on an air outlet pipeline connected with the gas phase flow passage of the heat exchanger, and the pressure sensor and the adjusting valve B are respectively connected to the controller.

7. An LNG filling on-line saturation adjusting mechanism according to claim 3, characterized in that: the temperature sensor is used for monitoring the temperature of the liquefied natural gas after heat exchange through the liquid phase flow channel of the heat exchanger and transmitting temperature information to the controller, and the controller controls the opening of the regulating valve A according to the temperature information.

8. An LNG filling on-line saturation adjusting mechanism according to claim 6, characterized in that: the pressure sensor is used for monitoring the pressure of the gaseous natural gas before heat exchange through the gas phase flow channel of the heat exchanger and transmitting pressure information to the controller, and the controller controls the opening degree of the regulating valve B according to the pressure information and the temperature information.

9. A control method for LNG filling on-line saturation adjustment is characterized by comprising the following steps: the LNG filling online saturation adjusting mechanism comprises an infusion step, a gas increasing step and a heat exchange step, wherein the LNG filling online saturation adjusting mechanism comprises a liquid inlet valve, a liquid outlet valve and a liquid outlet valve;

the infusion steps are as follows: the liquid natural gas is pumped from the storage tank by the delivery pump, sequentially flows through the liquid removal inlet pipe, the liquid phase flow passage and the liquid removal outlet pipe to the liquid adding machine, and the liquid adding machine infuses liquid to the vehicle steel cylinder

The gas increasing step comprises the following steps: the liquid natural gas in the liquid removal inlet pipe sequentially passes through the flow dividing inlet pipe, the air-temperature vaporizer, the flow dividing outlet pipe and the gas phase channel of the heat exchanger and is finally merged into the liquid removal outlet pipe; vaporizing the liquefied natural gas in an air-temperature vaporizer; the temperature sensor is used for monitoring the temperature of the liquefied natural gas after heat exchange through the liquid phase flow channel and transmitting temperature information to the controller, and the controller controls the opening of the regulating valve A according to the temperature information; when the temperature sensor detects that the temperature is low, the temperature of the liquefied natural gas needs to be raised, the controller controls the opening of the regulating valve A to be increased, and the supply amount of the gaseous natural gas from the regulating valve A to the return air inlet pipe is increased;

the heat exchange step is as follows: when the temperature sensor detects that the temperature is low, the temperature of the liquefied natural gas needs to be raised, the controller controls the opening of the regulating valve A to be increased, and the supply amount of the gaseous natural gas from the regulating valve A to the return air inlet pipe is increased; at the moment, the gaseous natural gas in the gas phase flow passage is liquefied in the heat exchanger and releases latent heat; the liquid natural gas in the liquid phase flow passage absorbs the heat released by the gas phase flow passage, and the temperature is increased.

10. A control method for LNG filling on-line saturation adjustment is characterized by comprising the following steps: the LNG filling online saturation adjusting mechanism according to claim 5, comprising an infusion step, a gas return step, a gas increasing step and a heat exchange step;

the infusion steps are as follows: the liquid natural gas is pumped from the storage tank by the delivery pump, sequentially flows through the liquid removal inlet pipe, the liquid phase flow channel and the liquid removal outlet pipe to the liquid adding machine, and the liquid adding machine infuses liquid into the vehicle steel cylinder;

the air return step comprises the following steps: the gas natural gas in the vehicle steel cylinder passes through the gas return inlet pipe, the gas phase flow passage and the gas return outlet pipe in sequence to the storage tank through the liquid adding machine for gas return;

the gas increasing step comprises the following steps: the liquid natural gas in the liquid removal inlet pipe sequentially passes through the shunt inlet pipe, the air-temperature vaporizer and the shunt outlet pipe to the return air inlet pipe; the liquid natural gas is vaporized in the air-temperature vaporizer until the return gas enters the pipe, and the liquid natural gas becomes gaseous natural gas; the temperature sensor is used for monitoring the temperature of the liquefied natural gas after heat exchange through the liquid phase flow channel and transmitting temperature information to the controller, and the controller controls the opening of the regulating valve A according to the temperature information; when the temperature sensor detects that the temperature is low, the temperature of the liquefied natural gas needs to be raised, the controller controls the opening of the regulating valve A to be increased, and the supply amount of the gaseous natural gas from the regulating valve A to the return air inlet pipe is increased;

the heat exchange step is as follows: when the temperature measured by the temperature sensor is low, the temperature of the liquefied natural gas needs to be raised, and the controller sets a current saturation pressure set value according to temperature information; the pressure sensor is used for monitoring the pressure of the gaseous natural gas before heat exchange through the gas phase flow channel and transmitting pressure information to the controller, and the controller controls the opening of the regulating valve B according to the pressure information to ensure that the pressure reaches a saturation pressure set value; at the moment, the pressure of the gaseous natural gas in the gas phase flow channel reaches a saturation pressure set value, and the natural gas is liquefied and releases latent heat; the liquid natural gas in the liquid phase flow passage absorbs the heat released by the gas phase flow passage, and the temperature is increased.

Technical Field

The invention belongs to the field of natural gas filling, and particularly relates to an LNG filling on-line saturation adjusting mechanism and a control method.

Background

LNG is used as an important clean energy source, is widely applied to the fields of industry, civilian use and the like in recent years, and a large number of LNG fuel filling stations are built in logistics and passenger transport industries.

The LNG filling station comprises the processes of unloading, pressure regulating, temperature regulating, filling and the like, and the corresponding equipment comprises an unloading platform, a pressure and temperature regulating device, a delivery pump, a liquid adding machine and a station control system.

The LNG vehicle needs to be filled with LNG of a proper temperature to ensure its normal operation, and the filling temperature of different vehicles may be different, for example, the temperatures of LNG filled by walvo and gallop in europe are different, and if LNG is filled into LNG vehicles with different temperature requirements, the engine may be insufficiently filled with make-up gas, and if LNG is filled into LNG vehicles with too low temperature, the engine may be damaged, and the service life of the engine may be affected.

In the existing LNG station process, when the temperature of LNG in the storage tank is too low and needs to be increased, LNG liquid is generally input into the vaporizer through the transfer pump to absorb air heat and then is brought back to the storage tank to integrally increase the temperature of the LNG in the storage tank, so that the LNG vehicles with different temperature requirements cannot be adaptively adjusted.

The LNG temperature and pressure in the whole tank are increased, absolute heat insulation cannot be guaranteed due to the vacuum storage tank, the storage period of the LNG in the tank is shortened after the temperature is increased integrally, the phenomenon that the pressure of the storage tank is over-pressure to discharge evaporation gas is easy to occur during operation, and environmental pollution and economic loss are caused.

Disclosure of Invention

The invention provides an LNG filling online saturation adjusting mechanism and a control method, aiming at solving the problems of filling LNG liquid with proper temperature for different vehicles and reducing negative effects on the overall temperature increase of LNG in a storage tank.

The scheme is realized as follows:

the utility model provides a saturated mechanism is transferred on line in LNG filling which characterized in that: comprises a liquid conveying pipeline, a gas increasing pipeline and a heat exchanger; the liquid conveying pipeline and the gas increasing pipeline both penetrate through the heat exchanger and can exchange heat in the heat exchanger; the inlet of the aeration pipeline is connected to the inlet section of the transfusion pipeline.

Based on the structure, one end of the liquid removal pipeline is connected with the delivery pump, the other end of the liquid removal pipeline is connected with the liquid adding machine, the gas increasing pipeline is used for heat exchange of liquid which is separated from the liquid removal pipeline, LNG liquid on the liquid removal pipeline is heated through the heat exchanger, the liquid removal pipeline is a main pipeline, the gas increasing pipeline is an auxiliary pipeline, and the introduction amount of the auxiliary pipeline is usually set to be 1% -5% of the flow amount of the main pipeline.

Preferably, the infusion pipeline is connected with the storage tank and the liquid port of the liquid filling machine; a vaporizer is arranged on the gas increasing pipeline; the gas increasing pipeline penetrates through the heat exchanger and then is connected to the storage tank, or the gas increasing pipeline penetrates through the heat exchanger and then is connected to the outlet section of the liquid conveying pipeline.

Preferably, the gas increasing pipeline is provided with a regulating valve A, and the regulating valve A is positioned on a pipeline connecting line between the vaporizer and the heat exchanger; be provided with temperature sensor on the liquid removal pipeline, governing valve A and temperature sensor are connected to the controller respectively.

Preferably, when the gas increasing pipeline penetrates through the heat exchanger and is connected to the outlet section of the liquid conveying pipeline, the LNG in the liquid conveying pipeline absorbs heat through the heat exchanger, absorbs heat with the LNG in the gas increasing pipeline through the vaporizer and releases heat through the heat exchanger, and then converges to the outlet section of the liquid conveying pipeline; LNG in the gas increasing pipeline is gasified into a gaseous state after absorbing heat through the vaporizer, and is liquefied into a liquid state after releasing heat in the heat exchanger. The return air line is now directly connected to the storage tank.

Preferably, when the gas increasing pipeline passes through the heat exchanger and then is connected to the storage tank; be connected with the gas return line between liquid phase mouth and the storage tank of liquid feeding machine, the gas increase pipeline is including gasification inlet pipe end and gasification outlet pipe end, and wherein gasification inlet pipe end, gasification outlet pipe end connect the vaporizer respectively, gasification inlet pipe end is connected to the induction zone of infusion pipeline, gasification outlet pipe end is connected to the gas return line after, the gas return line is connected to the storage tank after passing the heat exchanger.

Preferably, a pressure sensor and an adjusting valve B are arranged at two ends of the heat exchanger on the air return line, the pressure sensor is arranged on an air inlet pipeline connected with the gas phase flow passage of the heat exchanger, the adjusting valve B is arranged on an air outlet pipeline connected with the gas phase flow passage of the heat exchanger, and the pressure sensor and the adjusting valve B are respectively connected with the controller.

Preferably, the heat exchanger is a plate heat exchanger and is used for high-efficiency heat exchange of media in the liquid-phase flow channel and the gas-phase flow channel.

Preferably, the temperature sensor is used for monitoring the temperature of the liquefied natural gas after heat exchange through the liquid phase flow channel of the heat exchanger, and transmitting temperature information to the controller, and the controller controls the opening of the regulating valve A according to the temperature information.

Preferably, the pressure sensor is used for monitoring the pressure of the gaseous natural gas before heat exchange through the gas phase flow channel of the heat exchanger, and transmitting pressure information to the controller, and the controller controls the opening of the regulating valve B according to the pressure information and the temperature information.

The invention relates to a control method for LNG filling on-line saturation adjustment, which comprises a liquid infusion step, a gas increasing step and a heat exchange step;

the infusion steps are as follows: the liquid natural gas is pumped from the storage tank by the delivery pump, sequentially flows through the liquid removal inlet pipe, the liquid phase flow passage and the liquid removal outlet pipe to the liquid adding machine, and the liquid adding machine infuses liquid to the vehicle steel cylinder

The gas increasing step comprises the following steps: the liquid natural gas in the liquid removal inlet pipe sequentially passes through the flow dividing inlet pipe, the air-temperature vaporizer, the flow dividing outlet pipe and the gas phase channel of the heat exchanger and is finally merged into the liquid removal outlet pipe; vaporizing the liquefied natural gas in an air-temperature vaporizer; the temperature sensor is used for monitoring the temperature of the liquefied natural gas after heat exchange through the liquid phase flow channel and transmitting temperature information to the controller, and the controller controls the opening of the regulating valve A according to the temperature information; when the temperature sensor detects that the temperature is low, the temperature of the liquefied natural gas needs to be raised, the controller controls the opening of the regulating valve A to be increased, and the supply amount of the gaseous natural gas from the regulating valve A to the return air inlet pipe is increased;

the heat exchange step is as follows: when the temperature sensor detects that the temperature is low, the temperature of the liquefied natural gas needs to be raised, the controller controls the opening of the regulating valve A to be increased, and the supply amount of the gaseous natural gas from the regulating valve A to the return air inlet pipe is increased; at the moment, the gaseous natural gas in the gas phase flow passage is liquefied in the heat exchanger and releases latent heat; the liquid natural gas in the liquid phase flow passage absorbs the heat released by the gas phase flow passage, and the temperature is increased.

The invention discloses another control method for LNG filling on-line saturation adjustment, which comprises a liquid infusion step, a gas return step, a gas increasing step and a heat exchange step;

the infusion steps are as follows: the liquid natural gas is pumped from the storage tank by the delivery pump, sequentially flows through the liquid removal inlet pipe, the liquid phase flow channel and the liquid removal outlet pipe to the liquid adding machine, and the liquid adding machine infuses liquid into the vehicle steel cylinder;

the air return step comprises the following steps: the gas natural gas in the vehicle steel cylinder passes through the gas return inlet pipe, the gas phase flow passage and the gas return outlet pipe in sequence to the storage tank through the liquid adding machine for gas return;

the gas increasing step comprises the following steps: the liquid natural gas in the liquid removal inlet pipe sequentially passes through the shunt inlet pipe, the air-temperature vaporizer and the shunt outlet pipe to the return air inlet pipe; the liquid natural gas is vaporized in the air-temperature vaporizer until the return gas enters the pipe, and the liquid natural gas becomes gaseous natural gas; the temperature sensor is used for monitoring the temperature of the liquefied natural gas after heat exchange through the liquid phase flow channel and transmitting temperature information to the controller, and the controller controls the opening of the regulating valve A according to the temperature information; when the temperature sensor detects that the temperature is low, the temperature of the liquefied natural gas needs to be raised, the controller controls the opening of the regulating valve A to be increased, and the supply amount of the gaseous natural gas from the regulating valve A to the return air inlet pipe is increased;

the heat exchange step is as follows: when the temperature measured by the temperature sensor is low, the temperature of the liquefied natural gas needs to be raised, and the controller sets a current saturation pressure set value according to temperature information; the pressure sensor is used for monitoring the pressure of the gaseous natural gas before heat exchange through the gas phase flow channel and transmitting pressure information to the controller, and the controller controls the opening of the regulating valve B according to the pressure information to ensure that the pressure reaches a saturation pressure set value; at the moment, the pressure of the gaseous natural gas in the gas phase flow channel reaches a saturation pressure set value, and the natural gas is liquefied and releases latent heat; the liquid natural gas in the liquid phase flow passage absorbs the heat released by the gas phase flow passage, and the temperature is increased.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention discloses an LNG filling on-line saturation adjusting mechanism and a control method, wherein a liquid removal pipeline is provided with a gas increasing pipeline, the gas increasing pipeline is provided with a heat exchange device, heat exchange is carried out through the heat exchange device, the temperature of output LNG is dynamically increased on line, and the adaptive temperature adjustment of LNG vehicles with different temperature requirements can be realized; compared with the conventional mode of integrally heating and adjusting the temperature of the storage tank and saturating, the device increases the storage period of the LNG in the storage tank and reduces the emission pollution and waste of BOG evaporated gas.

2. The invention discloses an LNG filling on-line saturation adjusting mechanism and a control method, wherein a delivery pump, a liquid removing inlet pipe, a liquid phase flow passage, a liquid removing outlet pipe and a liquid adding machine are sequentially communicated; the liquid adding machine, the air return inlet pipe, the gas phase flow channel, the air return outlet pipe and the storage tank are communicated in sequence; the liquid removal inlet pipe, the flow dividing inlet pipe, the air temperature type vaporizer, the flow dividing outlet pipe and the air return inlet pipe are communicated in sequence; a temperature sensor is arranged on the liquid removal outlet pipe, a pressure sensor is arranged on the air return inlet pipe, an adjusting valve B is arranged on the air return outlet pipe, and an adjusting valve A is arranged on the flow dividing outlet pipe; the controller is respectively and electrically connected with the temperature sensor, the pressure sensor, the regulating valve A and the regulating valve B. According to the LNG filling online saturation adjusting mechanism and the control method, the LNG in the filling process is heated, the LNG in the storage tank is still maintained in a low-temperature and low-pressure state, the storage life of the LNG in the storage tank is prolonged, and the phenomena of discharge waste and environmental pollution are reduced.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is a schematic structural view of embodiment 2 of the present invention;

in the figure: 1-heat exchanger, 11-liquid phase flow channel, 12-gas phase flow channel, 2-temperature sensor, 3-air temperature type vaporizer, 4-adjusting valve A, 5-pressure sensor, 6-adjusting valve B, 71-liquid-removing inlet pipe, 72-liquid-removing outlet pipe, 73-return-air inlet pipe, 74-return-air outlet pipe, 75-shunt inlet pipe and 76-shunt outlet pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.