CN219605353U - Heat accumulating type natural gas residual pressure utilization system - Google Patents

Abstract

The utility model relates to the technical field of natural gas residual pressure utilization, and discloses a heat accumulating type natural gas residual pressure utilization system, which comprises: the system comprises an expansion acting unit, a heat collecting unit, a heat accumulating unit and a natural gas reheating unit; the expansion acting unit is used for recycling the pressure energy of the natural gas; the heat collection unit is used for collecting heat of the expansion acting unit; the natural gas reheating unit is used for reheating natural gas and releasing natural gas cooling capacity; the heat storage unit is used for storing heat of the heat collection unit and cooling the heat collection unit by utilizing natural gas cooling capacity of the natural gas reheating unit. The heat accumulating type natural gas residual pressure utilizing system solves the technical problem that the efficiency and economic benefit of the natural gas residual pressure utilizing system in the prior art are influenced by environmental factors, and has the advantages of wide using temperature range and wide regional range.

Description

Regenerative natural gas residual pressure utilization system

technical field

The utility model relates to the technical field of natural gas residual pressure utilization, in particular to a regenerative natural gas residual pressure utilization system.

Background technique

The transportation of natural gas is to compress the natural gas to a state of high pressure and normal temperature through a compressor, transport it to the natural gas gate station through a pipeline, and depressurize it to the downstream pipeline transportation condition through a pressure reducing valve at each level of the natural gas gate station, and finally to the user. The above-mentioned pressure reducing valve produces a large energy loss during the decompression process. If this part of the pressure can be used, it will bring considerable economic benefits. This research direction is the natural gas residual pressure utilization technology. Natural gas residual pressure utilization technology mainly includes power generation technology, refrigeration technology and the combination of the two.

Natural gas residual pressure power generation technology is a technology that replaces the natural gas gate station pressure reducing valve with an expander, and the expander drives the gearbox and generator to generate electricity under the pressure difference. The natural gas residual pressure power generation system is a power generation system using the natural gas residual pressure power generation technology. Since the temperature of the natural gas after the expander will reach minus tens of degrees, the existing technology usually uses an ice maker to recycle this part of cold energy, and then realizes it through the vaporizer. Natural gas is reheated to meet the conditions for natural gas downstream pipeline transportation.

In the process of realizing the utility model, the inventor of the utility model found that there are at least the following problems in the prior art: in winter or when the ambient temperature is low, the temperature of the water passing through the ice maker is low, and the ice maker absorbs cold energy ability is limited. After the ice machine absorbs the cold energy, the temperature of the natural gas is often not up to the transportation condition. At this time, if the carburetor is used for reheating, the carburetor will also be affected by the ambient temperature, its surface will freeze, and the reheating effect is not ideal. At present, natural gas residual pressure power generation systems operating in winter or in low ambient temperature conditions usually use electric heaters for reheating. At this time, corresponding power supplies need to be configured, which will reduce the overall economic benefits of natural gas residual pressure power generation systems. The above factors will directly lead to low economic benefits of natural gas residual pressure utilization systems (for example, natural gas residual pressure power generation systems) in areas with low temperature or low ambient temperature all year round, making it difficult to implement new development concepts and achieve the "double carbon" goal.

Utility model content

The purpose of the utility model is to provide a regenerative natural gas residual pressure utilization system utilizing the internal heat energy of the system, which solves the technical problem in the prior art that the efficiency and economic benefits of the natural gas residual pressure utilization system are affected by environmental factors.

For reaching this purpose, the technical scheme of the present utility model is as follows:

A regenerative natural gas residual pressure utilization system includes: an expansion work unit, a heat collection unit, a heat storage unit, and a natural gas reheating unit; the expansion work unit is used to recycle the pressure energy of natural gas; the heat collection unit is used for The heat collected from the expansion work unit; the natural gas reheating unit is used to reheat natural gas and release the cooling capacity of natural gas; the heat storage unit is used to store the heat of the heat collection unit and use the natural gas to reheat The natural gas cooling capacity of the unit cools the collector unit.

Further, the heat collection unit includes a first heat collection unit, and the first heat collection unit includes a lubricating oil station and a lubricating oil heat exchanger; the lubricating oil station is used to store lubricating oil; the lubricating oil is passed through the After the expansion work unit, the temperature rises, then passes through the heat flow line of the lubricating oil heat exchanger, and exchanges heat with the cold flow line of the lubricating oil heat exchanger in the lubricating oil heat exchanger, and finally Flow back to the lube station.

Further, the expansion work unit includes an expander; the first heat collection unit includes a first heat collection branch, and the lubricating oil enters the lubricating oil inlet of the expander through the first heat collection branch, Then, the lubricating oil outlet of the expander flows back to the lubricating oil station through the heat flow pipeline of the lubricating oil heat exchanger.

Further, the expansion work unit includes a gear box; the first heat collecting unit includes a second heat collecting branch, and the lubricating oil enters the lubricating oil inlet of the gearbox through the second heat collecting branch, Then, the lubricating oil outlet of the gearbox flows back to the lubricating oil station through the heat flow pipeline of the lubricating oil heat exchanger.

Further, the expansion work unit includes a generator; the first heat collecting unit includes a third heat collecting branch, and the lubricating oil enters the lubricating oil inlet of the generator through the third heat collecting branch, Then, the lubricating oil outlet of the generator flows back to the lubricating oil station through the heat flow pipeline of the lubricating oil heat exchanger.

Further, the natural gas reheating unit includes a natural gas reheating heat exchanger; the exhaust gas of natural gas passing through the expansion work unit enters the cold flow pipeline of the natural gas reheating heat exchanger, where the natural gas reheating heat exchanger The reheated natural gas is formed after exchanging heat with the heat flow pipeline of the natural gas reheat heat exchanger in the reheater.

Further, the heat storage unit includes a heat storage tank and a buffer tank; the heat storage working fluid in the heat storage tank enters the buffer tank after passing through the heat flow pipeline of the natural gas reheat heat exchanger, and then passes through the heat storage tank. The cold flow pipeline of the lubricating oil heat exchanger flows back to the heat storage tank; the heat storage working medium is a fluid with a boiling point less than or equal to 100 degrees Celsius.

Further, the natural gas reheating unit also includes an ice maker, the exhaust gas of the expansion unit enters the ice maker, and the exhaust gas flowing out of the ice maker is reheated by the natural gas The cold flow line of the heater is flowing out.

Further, the expansion work unit includes a generator; the heat collection unit includes a second heat collection unit; the working medium of the second heat collection unit is cooling liquid, and the cooling liquid is a fluid with a boiling point of less than or equal to 100 degrees Celsius ; The second heat collection unit includes a generator heat exchanger, the heat flow pipeline outlet of the generator heat exchanger is connected to the cooling inlet of the generator through a pipeline, and the cooling outlet of the generator is connected to the power generator The inlet of the heat flow pipeline of the generator heat exchanger is connected by a pipeline; the coolant flows in from the cooling inlet of the generator, flows out from the cooling outlet of the generator, and then enters the heat flow pipeline of the generator heat exchanger , after exchanging heat with the cold flow pipeline of the generator heat exchanger in the generator heat exchanger, return to the cooling inlet of the generator.

Further, the heat storage unit includes a heat storage tank and a buffer tank; the natural gas reheat unit includes a natural gas reheat heat exchanger; the heat storage working medium in the heat storage tank passes through the natural gas reheat heat exchanger The heat flow pipeline enters the buffer tank, and then returns to the heat storage tank through the cold flow pipeline of the generator heat exchanger; the heat storage working medium is a fluid with a boiling point less than or equal to 100 degrees Celsius.

Further, the second heat collecting unit further includes a cooling liquid tank, and the cooling liquid tank is used to contain the cooling liquid.

Further, a lubricating oil temperature monitoring device is installed at the liquid outlet of the lubricating oil station.

Further, a lubricating oil heat exchange regulating valve is provided at the outlet of the cold flow pipeline of the lubricating oil heat exchanger.

Further, a lubricating oil temperature monitoring device is set at the liquid outlet of the lubricating oil station; a lubricating oil heat exchange regulating valve is set at the outlet of the cold flow pipeline of the lubricating oil heat exchanger; the lubricating oil temperature monitoring The device controls the opening degree of the lubricating oil heat exchange regulating valve.

Further, a generator temperature monitoring device is provided at the cooling inlet of the generator.

Further, the outlet of the cold flow pipeline of the generator heat exchanger is provided with a generator heat exchange regulating valve.

Further, a generator temperature monitoring device is provided at the cooling inlet of the generator; a generator heat exchange regulating valve is provided at the outlet of the cold flow pipeline of the generator heat exchanger; the generator temperature monitoring device Control the opening degree of the heat exchange regulating valve of the generator.

Further, a lubricating oil power pump is arranged at the outlet of the lubricating oil station; and/or, a lubricating oil check valve is arranged at the outlet of the lubricating oil station.

Further, a generator heat exchange power pump is provided on the pipeline of the cooling inlet of the generator.

Further, a natural gas reheating power pump is provided at the outlet of the heat storage tank; and/or, a heat storage protection structure is provided outside the heat storage tank; and/or, a heat storage protection structure is provided outside the buffer tank thermal protection structure; and/or, the heat storage tank is provided with a heat storage tank temperature monitoring device; and/or, the inlet of the buffer tank is provided with a natural gas reheat check valve.

Further, a natural gas reheat temperature monitoring device is installed at the outlet of the cold flow pipeline of the natural gas reheat heat exchanger.

The beneficial effects of the technical solution of the utility model:

The regenerative natural gas residual pressure utilization system includes an expansion work unit, a heat collection unit, a heat storage unit, and a natural gas reheating unit. The expansion work unit is used to recycle the pressure energy of natural gas. The expansion work unit will generate heat when the system is running. The heat collection unit is used to collect the heat of the expansion work unit. The natural gas reheating unit is used to reheat natural gas. During the process, the cold energy of natural gas will be released, and the thermal storage unit is used to store the heat of the heat collection unit, and the natural gas cold energy of the natural gas reheating unit is used to cool the heat collection unit.

It can be seen that the regenerative natural gas residual pressure utilization system of the utility model not only realizes natural gas residual pressure power generation and ice making, but also utilizes the thermal storage unit to collect the heat of the expansion unit during system operation, and utilizes the natural gas cooling capacity of the natural gas reheating unit Cooling of the heat collection unit, at the same time, the heat collected by the heat storage unit is used for natural gas reheating. Compared with the existing natural gas residual pressure utilization system, there is no need to set up electric heaters for reheating in winter or when the ambient temperature is low, thus avoiding environmental factors such as low temperature from affecting the efficiency and economy of the natural gas residual pressure utilization system. It has the advantages of high system efficiency, high system economic benefit, wide temperature range of system use and wide range of use regions.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a regenerative natural gas residual pressure utilization system according to Embodiment 1 of the utility model;

Fig. 2 is a schematic diagram of the overall structure of the regenerative natural gas residual pressure utilization system according to the second embodiment of the utility model.

In the figure: 1-expander; 2-ice maker; 3-gearbox; 4-generator; 5-lubricating oil station; 6-lubricating oil power pump; 7-lubricating oil check valve; 8-lubricating oil temperature Monitoring device; 9-lubricating oil heat exchanger; 10-generator heat exchanger; 11-coolant tank; 12-generator heat exchange power pump; 13-generator temperature monitoring device; 14-generator heat exchange regulating valve ;15-lubricating oil heat exchange regulating valve; 16-heat storage tank; 17-heat storage tank temperature monitoring device; 18-heat storage protection structure; 19-natural gas reheat power pump; 20-natural gas reheat heat exchanger; 21 - natural gas reheat check valve; 22 - buffer tank; 23 - buffer protection structure; 24 - natural gas reheat temperature monitoring device.

Detailed ways

In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only Some embodiments of the utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

Embodiment one:

The regenerative natural gas residual pressure utilization system provided in this embodiment includes: an expansion work unit, a heat collection unit, a heat storage unit, and a natural gas reheating unit; the expansion work unit is used to recycle the pressure energy of natural gas; the heat collection unit is used for The collected heat of the expansion work unit; the natural gas reheating unit is used to reheat the natural gas and release the natural gas cooling capacity; the heat storage unit is used to store the heat of the heat collecting unit, and use the natural gas cooling capacity of the natural gas reheating unit to cool the set heat unit.

The regenerative natural gas residual pressure utilization system provided in this embodiment includes: an expansion work unit, a heat collection unit, a heat storage unit, and a natural gas reheating unit. The expansion work unit is used to recycle the pressure energy of natural gas. The expansion work unit will generate heat when the system is running. The heat collection unit is used to collect the heat of the expansion work unit. The natural gas reheating unit is used to reheat natural gas. During the process, the cold energy of natural gas will be released, and the thermal storage unit is used to store the heat of the heat collection unit, and the natural gas cold energy of the natural gas reheating unit is used to cool the heat collection unit.

The regenerative natural gas residual pressure utilization system provided in this embodiment not only realizes natural gas residual pressure power generation, but also uses the heat storage unit to collect the heat of the expansion unit during system operation, and uses the natural gas cooling capacity of the natural gas reheating unit to cool the heat collecting unit , At the same time, the heat collected by the thermal storage unit is used for natural gas reheating. Compared with the existing natural gas residual pressure utilization system, there is no need to set up electric heaters for reheating in winter or when the ambient temperature is low, thus avoiding environmental factors such as low temperature from affecting the efficiency and economy of the natural gas residual pressure utilization system. It has the advantages of high system efficiency, high system economic benefit, wide temperature range of system use and wide range of use regions.

Further, as shown in Figure 1, the heat collecting unit includes a first heat collecting unit, and the first heat collecting unit includes a lubricating oil station 5 and a lubricating oil heat exchanger 9; the lubricating oil station 5 is used to store lubricating oil; After the oil passes through the expansion work unit, the temperature rises, then passes through the heat flow pipeline of the lubricating oil heat exchanger 9, and exchanges heat with the cold flow pipeline of the lubricating oil heat exchanger to cool down, and finally flows back to the lubricating oil station 5. Wherein, the lubricating oil heat exchanger 9 is an existing heat exchanger, and the heat exchanger also has a heat flow pipeline and a cold flow pipeline, and the heat flow pipeline refers to a pipeline in which the inlet flows into a heat medium. The cold flow pipeline refers to the pipeline in which the inlet flows into the cold medium, and the cold medium and the hot medium exchange heat in the heat exchanger.

Further, as shown in Figure 1, the heat collection unit includes a first heat collection unit, and the first heat collection unit includes a lubricating oil station 5 and a lubricating oil heat exchanger 9; the lubricating oil station 5 is used to store lubricating oil; After expanding the work unit, the temperature rises, then passes through the heat flow pipeline of the lubricating oil heat exchanger 9, and exchanges heat with the cold flow pipeline of the lubricating oil heat exchanger 9 in the lubricating oil heat exchanger 9, and finally flows back to the lubricating oil Station 5.

Further, as shown in FIG. 1 , the expansion work unit includes an expander 1 . The first heat collecting unit includes a first heat collecting branch, through which the lubricating oil enters the lubricating oil inlet of the expander 1, and then passes through the heat flow tube of the lubricating oil heat exchanger 9 from the lubricating oil outlet of the expander 1 The road flows back to the lubricating oil station 5. The lubricating oil in the first heat-collecting branch enters the lubricating oil inlet of the expander 1, and the temperature of the lubricating oil flowing out from the lubricating oil outlet of the expander 1 is known to rise, and the lubricating oil with this temperature rise enters the lubricating oil subsequently The hot flow pipeline of the heat exchanger 9 exchanges heat with the cold flow pipeline of the lubricating oil heat exchanger 9 in the lubricating oil heat exchanger 9, and finally flows back to the lubricating oil station 5 to start the next cycle. The cold flow pipeline of the lubricating oil heat exchanger 9 is in the heat storage unit, and there is a circulating heat storage working medium in the heat storage unit.

Further, as shown in Figure 1, the expansion work unit includes a gearbox 2; the first heat collecting unit includes a second heat collecting branch, and the lubricating oil enters the lubricating oil inlet of the gearbox 2 through the second heat collecting branch, and then from The lubricating oil outlet of the gear box 2 flows back to the lubricating oil station 5 through the heat flow pipeline of the lubricating oil heat exchanger 9 . The lubricating oil in the second heat collecting branch passes through the lubricating oil inlet of the gear box 3, and the temperature of the lubricating oil flowing out from the lubricating oil outlet of the gear box 3 can be known by the known technology, and the lubricating oil that the temperature rises enters the lubricating oil subsequently The hot flow pipeline of the heat exchanger 9 exchanges heat with the cold flow pipeline of the lubricating oil heat exchanger 9 in the lubricating oil heat exchanger 9, and finally flows back to the lubricating oil station 5 to start the next cycle. The cold flow pipeline of the lubricating oil heat exchanger 9 is in the heat storage unit, and there is a circulating heat storage working medium in the heat storage unit.

Further, as shown in Figure 1, the natural gas reheating unit includes a natural gas reheating heat exchanger 20; the exhaust gas of the natural gas through the expansion work unit enters the cold flow pipeline of the natural gas reheating heat exchanger 20, and the natural gas reheating heat exchange The reheated natural gas is formed after exchanging heat with the heat flow pipeline of the natural gas reheat heat exchanger 20 in the reheater 20. Wherein, the natural gas reheating heat exchanger 20 is an existing heat exchanger, and the heat exchanger also has a heat flow pipeline and a cold flow pipeline, and the heat flow pipeline refers to a pipeline in which the inlet flows into a heat medium, so The above-mentioned cold flow pipeline refers to the pipeline in which the inlet flows into the cold medium, and the cold medium and the hot medium exchange heat in the heat exchanger.

Further, as shown in FIG. 1 , the heat flow pipeline of the natural gas reheat heat exchanger 20 is heated by the heat of the heat storage working medium of the heat storage unit. The heat storage unit includes a heat storage tank 16 and a buffer tank 22; the heat storage working fluid in the heat storage tank 16 enters the buffer tank 22 after passing through the heat flow pipeline of the natural gas reheat heat exchanger 20, and then passes through the lubricating oil heat exchanger. The cold flow pipeline of 9 flows back to the heat storage tank 16; the heat storage working medium is a fluid with a boiling point less than or equal to 100 degrees Celsius. The heat storage unit is used to recover the heat generated by the expansion unit during operation, and includes a heat storage tank 16 and a buffer tank 22 . The heat storage working medium in the heat storage tank 16 passes through the heat flow pipeline of the natural gas reheat heat exchanger 20, and enters into the buffer tank 22 due to heat exchange with the cold flow pipeline of the natural gas reheat heat exchanger 20. The temperature of the heat storage medium decreases, and then the low-temperature heat storage medium enters the cold flow pipeline of the lubricating oil heat exchanger 9 to re-cool the lubricating oil in the heat flow pipeline of the lubricating oil heat exchanger 9, that is, cooling the expansion work Used lubricating oil for parts inside the unit. At the same time, the low-temperature heat-storage working medium flowing out from the outlet of the cold flow pipeline of the lubricating oil heat exchanger 9 is heated, becomes a high-temperature heat-storage working medium again, and returns to the heat-storage tank. The heat storage working fluid is a fluid with a boiling point less than or equal to 100 degrees Celsius. Such a heat storage working medium can realize the above functions and is safe.

Further, the heat storage working medium is water. The above process can be realized by using water as the heat storage medium, and the water is very stable, which can ensure the safe and stable operation of the system.

Further, as shown in FIG. 1 , the natural gas reheating unit also includes an ice maker 2 , and the natural gas exhaust gas of the expansion unit enters the ice maker 2 and then flows out through the cold flow pipeline of the natural gas reheat heat exchanger 20 .

Further, as shown in Figure 1, the expansion work unit includes an expander 1, a gearbox 3 and a generator 4, and the exhausted natural gas after the work done by the expander 1 enters the ice machine 2 and then is reheated by natural gas for heat exchange The cold flow line of the device 20 flows out. The exhausted natural gas after the expander 1 has done work is low-temperature and low-pressure natural gas, and the exhausted gas enters the ice machine 2, and the ice machine 2 uses the cold energy of the natural gas to make ice. Installing the ice maker 2 in the natural gas reheating unit can use low-temperature and low-pressure natural gas to make ice, thereby further improving the efficiency of the system.

Further, as shown in FIG. 1 , the expansion working unit includes a generator 4; the heat collecting unit includes a second heat collecting unit; the working fluid of the second heat collecting unit is cooling liquid, and the cooling liquid is a fluid with a boiling point less than or equal to 100 degrees Celsius. The second heat collecting unit comprises a generator heat exchanger 10, the heat flow pipeline outlet of the generator heat exchanger 10 is connected with the cooling inlet of the generator 4 through a pipeline, and the cooling outlet of the generator 4 is connected with the heat flow of the generator heat exchanger 10 The inlet of the pipeline is connected by a pipeline; the coolant flows in from the cooling inlet of the generator 4, and then flows out from the cooling outlet of the generator 4. As known by the known technology, the temperature of the coolant passing through the generator increases, and then enters the generator heat exchanger The heat flow pipeline of 10, after exchanging heat with the cold flow pipeline of the generator heat exchanger 10 in the generator heat exchanger 10, the temperature of the coolant decreases, and the cooled coolant returns to the cooling inlet of the generator 4 , to start the next cooling cycle. Wherein, the generator heat exchanger is an existing heat exchanger, and the heat exchanger also has a heat flow pipeline and a cold flow pipeline. The flow pipeline refers to the pipeline in which the inlet flows into the cold medium, and the cold medium and the hot medium exchange heat in the heat exchanger. The cooling liquid of some existing generators is different from that of the expander and gearbox, so the cooling liquid of the generator is different from the cooling liquid of the expander or the cooling liquid of the gearbox in some selections. This embodiment also includes a second heat collection unit, and the second heat collection unit is used for cooling the generator.

Further, as shown in FIG. 1 , the heat storage medium in the heat storage tank 16 enters the buffer tank 22 after passing through the heat flow pipeline of the natural gas reheat heat exchanger 20 , and then passes through the cold flow pipeline of the generator heat exchanger 10 Back to the heat storage tank 16, use the natural gas cooling capacity of the natural gas reheating unit to cool the cooling liquid of the second heat collecting unit. The heat storage unit recovers the heat of the generator through the generator heat exchanger 10 .

Further, as shown in FIG. 1 , the second heat collection unit further includes a coolant tank 11 , and the coolant tank 11 is used to contain coolant. When some types of generators required more cooling liquid, use the cooling liquid tank 11 to dress the cooling liquid.

Further, the cooling liquid is water, that is, the cooling working medium of the generator is water. Water is a commonly used coolant for existing generators.

Further, as shown in FIG. 1 , a lubricating oil temperature monitoring device 8 is provided at the liquid outlet of the lubricating oil station 5 for detecting the liquid outlet temperature of the lubricating oil station 5 .

Further, as shown in FIG. 1 , a lubricating oil heat exchange regulating valve 15 is provided at the outlet of the cold flow pipeline of the lubricating oil heat exchanger 9 for adjusting the flow rate at the outlet of the cold flow pipeline of the lubricating oil heat exchanger 9 .

Further, as shown in FIG. 1 , the lubricating oil temperature monitoring device 8 controls the opening degree of the lubricating oil heat exchange regulating valve 15 . According to the temperature feedback from the lubricating oil temperature monitoring device 8, the lubricating oil heat exchange regulating valve 15 will automatically adjust the opening to maintain a constant lubricating oil supply temperature of the expander 2 and/or the gearbox 3.

Further, as shown in FIG. 1 , a lubricating oil power pump 6 is provided at the outlet of the lubricating oil station 5 for controlling the oil supply pressure of the expander 1 and/or the gearbox 3 .

Further, as shown in FIG. 1 , a lubricating oil check valve 7 is provided at the outlet of the lubricating oil station 5 to prevent the lubricating oil from flowing back. Further, as shown in FIG. 1 , the lubricating oil check valve 7 is located at the outlet of the lubricating oil power pump 6 . The lubricating oil temperature monitoring device 8 is located at the outlet of the lubricating oil check valve 7 .

Further, as shown in FIG. 1 , a generator temperature monitoring device 13 is provided at the cooling inlet of the generator 4 to monitor the temperature of the coolant entering the generator 4 .

Further, as shown in FIG. 1 , the outlet of the cold flow pipeline of the generator heat exchanger 10 is provided with a generator heat exchange regulating valve 14 for adjusting the flow rate at the outlet of the cold flow pipeline of the generator heat exchanger 10 .

Further, the generator temperature monitoring device 13 controls the opening degree of the generator heat exchange regulating valve 14 . According to the temperature feedback from the generator temperature monitoring device 13, the generator heat exchange regulating valve 14 will automatically adjust the opening to maintain a constant temperature of the coolant (generator cooling medium) of the generator 4 .

Further, as shown in FIG. 1 , a generator heat exchange power pump 12 is provided on the pipeline of the cooling inlet of the generator to ensure the pressure required for the cooling effect of the generator 4 .

Further, a generator heat exchange power pump 12 is provided on the pipeline of the cooling inlet of the generator for controlling the circulation rate of the second heat collection unit. Further, the generator temperature monitoring device 13 is arranged at the outlet of the generator heat exchange power pump 12 .

Further, a natural gas reheat power pump 19 is provided at the outlet of the heat storage tank 16 for controlling the circulation rate of the heat storage unit.

Further, a natural gas reheat check valve 21 is provided at the inlet of the buffer tank 22 to prevent the cooled heat storage working fluid from flowing backward.

Further, a natural gas reheat temperature monitoring device 24 is installed at the outlet of the cold flow pipeline of the natural gas reheat heat exchanger 20 for monitoring the temperature of the natural gas entering the natural gas low-pressure side pipeline.

Further, a heat storage protection structure 18 is provided on the outside of the heat storage tank 16 , and/or a heat storage protection structure 23 is provided on the outside of the buffer tank 22 . The functions of the heat storage protection structure are mainly heat preservation and anti-collision, and the heat storage protection structure can adopt the existing heat preservation layer and heat preservation paint.

Further, the thermal storage tank 16 is provided with a thermal storage tank temperature monitoring device 17 for monitoring the temperature in the thermal storage tank.

Embodiment two:

As shown in Figure 2, the heat storage type natural gas residual pressure utilization system implemented in this implementation, on the basis of Embodiment 1, the first heat collection unit also includes a third heat collection branch, and the lubricating oil flowing out from the lubricating oil station 5 passes through The third heat collection branch enters the lubricating oil inlet of the generator 4, and then flows back to the lubricating oil station 5 from the lubricating oil outlet of the generator 4 through the heat flow pipeline of the lubricating oil heat exchanger 9.

In the regenerative natural gas residual pressure utilization system of this embodiment, the first heat collecting unit can also lead to a third heat collecting branch, and the third heat collecting branch is used to cool the generator 4 cooled by oil. The lubricating oil whose temperature rises after the use of the generator 4 also passes through the heat flow pipeline of the lubricating oil heat exchanger 9 , and returns to the lubricating oil station 5 after being cooled by the cold energy of the heat storage unit. The regenerative natural gas residual pressure utilization system of this embodiment cools the generator 4 of the expansion work unit through the third heat collection branch, and is suitable for oil-cooled generators.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (21)

1. A regenerative natural gas residual pressure utilization system, comprising: the system comprises an expansion acting unit, a heat collecting unit, a heat accumulating unit and a natural gas reheating unit;

the expansion acting unit is used for recycling the pressure energy of the natural gas;

the heat collection unit is used for collecting heat of the expansion acting unit;

the natural gas reheating unit is used for reheating natural gas and releasing natural gas cooling capacity;

the heat storage unit is used for storing heat of the heat collection unit and cooling the heat collection unit by utilizing natural gas cooling capacity of the natural gas reheating unit.

2. The regenerative natural gas residual pressure utilization system of claim 1, wherein the heat collection unit comprises a first heat collection unit comprising a lubricating oil station, a lubricating oil heat exchanger; the lubricating oil station is used for storing lubricating oil;

the temperature of the lubricating oil rises after passing through the expansion acting unit, then passes through a hot flow pipeline of the lubricating oil heat exchanger, exchanges heat with a cold flow pipeline of the lubricating oil heat exchanger in the lubricating oil heat exchanger, and finally flows back to the lubricating oil station.

3. The regenerative natural gas residual pressure utilization system of claim 2, wherein the expansion work cell comprises an expander;

the first heat collection unit comprises a first heat collection branch, the lubricating oil enters the lubricating oil inlet of the expander through the first heat collection branch, and then flows back to the lubricating oil station from the lubricating oil outlet of the expander through the heat flow pipeline of the lubricating oil heat exchanger.

4. The regenerative natural gas residual pressure utilization system of claim 2, wherein the expansion work cell comprises a gearbox;

the first heat collection unit comprises a second heat collection branch, and the lubricating oil enters the lubricating oil inlet of the gear box through the second heat collection branch and then flows back to the lubricating oil station from the lubricating oil outlet of the gear box through the heat flow pipeline of the lubricating oil heat exchanger.

5. The regenerative natural gas residual pressure utilization system of claim 2, wherein the expansion work cell comprises a generator;

the first heat collection unit comprises a third heat collection branch, and the lubricating oil enters the lubricating oil inlet of the generator through the third heat collection branch and then flows back to the lubricating oil station from the lubricating oil outlet of the generator through the heat flow pipeline of the lubricating oil heat exchanger.

6. The regenerative natural gas residual pressure utilization system of claim 2, wherein the natural gas reheat unit comprises a natural gas reheat heat exchanger;

and the natural gas exhaust gas passing through the expansion acting unit enters a cold flow pipeline of the natural gas reheating heat exchanger, and the reheated natural gas is formed after heat exchange with a hot flow pipeline of the natural gas reheating heat exchanger in the natural gas reheating heat exchanger.

7. The regenerative natural gas residual pressure utilization system according to claim 6, wherein the heat storage unit comprises a heat storage tank and a buffer tank;

the heat storage working medium in the heat storage tank enters the buffer tank after passing through a hot flow pipeline of the natural gas reheating heat exchanger and then flows back to the heat storage tank through a cold flow pipeline of the lubricating oil heat exchanger;

the heat storage working medium is fluid with the boiling point less than or equal to 100 ℃.

8. The regenerative natural gas residual pressure utilization system according to claim 6, wherein the natural gas reheating unit further comprises an ice maker, natural gas exhaust gas of the expansion work unit enters the ice maker, and natural gas exhaust gas flowing out of the ice maker flows out through a cold flow pipeline of the natural gas reheating heat exchanger.

9. The regenerative natural gas residual pressure utilization system of claim 1, wherein the expansion work cell comprises a generator;

the heat collecting unit comprises a second heat collecting unit;

the working medium of the second heat collection unit is cooling liquid, and the cooling liquid is fluid with the boiling point less than or equal to 100 ℃;

the second heat collection unit comprises a generator heat exchanger, a heat flow pipeline outlet of the generator heat exchanger is connected with a cooling inlet of the generator through a pipeline, and a cooling outlet of the generator is connected with a heat flow pipeline inlet of the generator heat exchanger through a pipeline;

the cooling liquid flows in from the cooling inlet of the generator, flows out from the cooling outlet of the generator, then enters the hot flow pipeline of the generator heat exchanger, exchanges heat with the cold flow pipeline of the generator heat exchanger in the generator heat exchanger, and returns to the cooling inlet of the generator.

10. The regenerative natural gas residual pressure utilization system according to claim 9, wherein the heat storage unit comprises a heat storage tank and a buffer tank;

the natural gas reheating unit comprises a natural gas reheating heat exchanger;

the heat storage working medium in the heat storage tank enters the buffer tank after passing through a hot flow pipeline of the natural gas reheating heat exchanger, and returns to the heat storage tank after passing through a cold flow pipeline of the generator heat exchanger; the heat storage working medium is fluid with the boiling point less than or equal to 100 ℃.

11. The regenerative natural gas residual pressure utilizing system according to claim 9, wherein the second heat collecting unit further comprises a coolant tank for containing the coolant.

12. The regenerative natural gas residual pressure utilization system according to claim 2, wherein a lubricant temperature monitoring device is arranged at a liquid outlet of the lubricant station.

13. The regenerative natural gas residual pressure utilization system according to claim 2, wherein a lube oil heat exchange regulating valve is arranged at the outlet of the cold flow pipeline of the lube oil heat exchanger.

14. The regenerative natural gas residual pressure utilization system according to claim 2, wherein a lubricant temperature monitoring device is arranged at a liquid outlet of the lubricant station; a lubricating oil heat exchange regulating valve is arranged at the outlet of a cold flow pipeline of the lubricating oil heat exchanger; the lubricating oil temperature monitoring device controls the opening degree of the lubricating oil heat exchange regulating valve.

15. The regenerative natural gas residual pressure utilizing system according to claim 9, wherein a generator temperature monitoring device is provided at a cooling inlet of the generator.

16. The regenerative natural gas residual pressure utilization system according to claim 9, wherein a generator heat exchange regulating valve is arranged at an outlet of a cold flow pipeline of the generator heat exchanger.

17. The regenerative natural gas residual pressure utilization system according to claim 9, wherein a generator temperature monitoring device is arranged at a cooling inlet of the generator; a generator heat exchange regulating valve is arranged at the outlet of the cold flow pipeline of the generator heat exchanger; and the generator temperature monitoring device controls the opening degree of the generator heat exchange regulating valve.

18. The regenerative natural gas residual pressure utilization system according to claim 2, wherein a lubricant power pump is provided at an outlet of the lubricant station;

and/or a lubricating oil check valve is arranged at the outlet of the lubricating oil station.

19. The regenerative natural gas residual pressure utilization system of claim 5 or claim 9, wherein a generator heat exchange power pump is provided on a conduit of a cooling inlet of the generator.

20. The regenerative natural gas residual pressure utilization system according to claim 7 or claim 10, wherein a natural gas reheat power pump is arranged at an outlet of the heat storage tank;

and/or a heat storage protection structure is arranged outside the heat storage tank;

and/or a heat storage protection structure is arranged outside the cache tank;

and/or a heat storage tank temperature monitoring device is arranged on the heat storage tank;

and/or a natural gas reheating check valve is arranged at the inlet of the buffer tank.

21. The regenerative natural gas residual pressure utilization system according to claim 6, wherein a natural gas reheat temperature monitoring device is arranged at a cold flow pipeline outlet of the natural gas reheat heat exchanger.