Background
Water-ethylene glycol based hydronic vaporization systems are used for hydronic vaporization of LNG (Liquefied Natural Gas).
The water-glycol is a glycol aqueous solution, and is suitable for heating and gasifying liquid LNG in a circulating heating and evaporating system due to the low freezing point of the water-glycol.
Fig. 1 discloses a schematic structural diagram of a circulation heating evaporation system in the prior art, and in the circulation heating evaporation system shown in fig. 1, the circulation heating evaporation system based on water-glycol consists of an expansion cabinet 101, a water-glycol pump 102, a plate heat exchanger 103, an evaporator 104, a heater 105, a series of valves, a seawater pump and the like.
The water-glycol passes through the evaporator 104 and the heater 105, exchanges heat with the liquefied natural gas entering from the liquefied natural gas inlet 108, heats and gasifies the liquefied natural gas, the cooled water-glycol has a low temperature, and the gaseous natural gas is output from the gaseous natural gas outlet 109.
To ensure the recycling, the water-glycol solution is heated.
In the circulation heating evaporation system shown in fig. 1, water-glycol is heated by seawater, the heat exchange device is a plate heat exchanger 103, a seawater inlet 106 is connected with the plate heat exchanger 103 to input seawater, and a seawater outlet 107 is connected with the plate heat exchanger 103 to output seawater.
However, in the heat exchange mode, a seawater pump is additionally arranged at the seawater inlet 106, so that on one hand, the energy consumption is high, on the other hand, seawater is corrosive, and is easy to corrode pipelines and heat exchange equipment, so that water-glycol leakage is easy to cause, and the environment is polluted.
Meanwhile, the glycol is colorless, odorless and sweet liquid, has toxicity to animals, and needs to be considered for safety when being used.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel circulation heating vaporization system, it is great to solve prior art's circulation heating vaporization system energy consumption, and the flue gas heat source does not have make full use of's problem.
In order to achieve the above object, the utility model provides a novel circulation heating vaporization system, including expansion cabinet, first fluid pump, tubular heat exchanger, heater and evaporimeter:
the input end of the expansion cabinet is connected with the heater, the output end of the expansion cabinet is connected with the first fluid pump, and the first fluid after cooling and expansion is released and stored;
the input end of the first fluid pump is connected with the expansion cabinet, and the output end of the first fluid pump is connected with the tubular heat exchanger and used for conveying a first fluid;
the first input end of the tubular heat exchanger is connected with the first fluid pump, the first output end of the tubular heat exchanger is connected with the evaporator, the second input end of the tubular heat exchanger is connected with the hot flue gas inlet, the second output end of the tubular heat exchanger is connected with the cold flue gas outlet, and the first fluid exchanges heat with the hot flue gas;
the first input end of the evaporator is connected with the tubular heat exchanger, the first output end of the evaporator is connected with the heater, the second input end of the evaporator is connected with the liquid second fluid inlet, and the second output end of the evaporator is connected with the heater to evaporate the liquid second fluid into gaseous second fluid;
the first input end of the heater is connected with the evaporator, the first output end of the heater is connected with the expansion cabinet, the second input end of the heater is connected with the evaporator, and the second output end of the heater is connected with the gaseous second fluid outlet to heat the gaseous second fluid.
In one embodiment, the first fluid pump delivers a first fluid of low temperature from the expansion cabinet to the first input of the tubular heat exchanger;
and the low-temperature first fluid in the tubular heat exchanger exchanges heat with hot flue gas to form high-temperature first fluid, and the high-temperature first fluid is output from the first output end of the tubular heat exchanger.
In one embodiment, the first input end of the evaporator inputs the first fluid with high temperature to exchange heat with the second fluid in liquid state, and the first fluid is output from the first output end of the evaporator.
And a second input end of the evaporator inputs the liquid second fluid, exchanges heat with the first fluid, evaporates the liquid second fluid into the gaseous second fluid, and outputs the gaseous second fluid from a second output end of the evaporator.
In one embodiment, the first input end of the heater inputs the first fluid to exchange heat with the gaseous second fluid, and the first fluid with low temperature is output from the first output end of the heater.
In one embodiment, the second input end of the heater inputs the gaseous second fluid to exchange heat with the first fluid to heat the gaseous second fluid, and the gaseous second fluid is output from the second output end of the heater.
In one embodiment, the tubular heat exchanger is a fixed tube sheet type, a floating head type or a U-shaped tubular type.
In one embodiment, a check valve is further arranged between the first fluid pump and the tubular heat exchanger to prevent the first fluid from flowing backwards.
In one embodiment, a stop valve is arranged between the tubular heat exchanger and the evaporator;
a stop valve is arranged between the tubular heat exchanger and the hot flue gas inlet;
and a stop valve is also arranged between the tubular heat exchanger and the cold flue gas outlet.
In one embodiment, a ball valve is further arranged between the evaporator and the heater.
The utility model provides a novel circulation heating vaporization system utilizes the flue gas after combustion apparatus such as boats and ships host computer, annex, boiler burns to carry out the heat transfer, and circulation heating evaporates liquefied natural gas, practices thrift a large amount of energy and equipment comparatively reliably be difficult for being corroded by the sea water.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in 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 present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The utility model is suitable for a liquid LNG heating gasification process among the boats and ships air supply system, the direct emission of flue gas after combustion apparatus such as boats and ships host computer, annex, boiler burns, and a large amount of heat sources do not utilize, the utility model discloses a novel circulation heating vaporization system can utilize the heat source, has practiced thrift a large amount of energy.
Fig. 2 discloses a schematic structural diagram of a novel circulation heating evaporation system according to an embodiment of the present invention, and in the embodiment shown in fig. 2, the present invention provides a novel circulation heating evaporation system, which comprises an expansion cabinet 201, a water-glycol pump 202, a tubular heat exchanger 203, an evaporator 204 and a heater 205.
In the embodiment shown in fig. 2, the first fluid is water-ethylene glycol and the second fluid is natural gas.
And the input end of the expansion cabinet 201 is connected with the heater 205, and the output end of the expansion cabinet is connected with the water-glycol pump 202.
During normal operation of the system, the cooled water-glycol volume expands and the expansion tank 201 is used to release and store the cooled expanded water-glycol.
And the input end of the water-glycol pump 202 is connected with the expansion cabinet 201, and the output end of the water-glycol pump is connected with the tubular heat exchanger 203 to convey water-glycol fluid.
The first input end of the tubular heat exchanger 203 is connected with the water-glycol pump 202, the second input end is connected with the hot flue gas inlet 206, the first output end is connected with the evaporator 204, the second output end is connected with the cold flue gas outlet 207, and heat exchange is carried out between the water-glycol and the hot flue gas.
The tube heat exchanger 203 may be a fixed tube sheet, a floating head, or a U-tube.
The fixed tube-plate heat exchanger is formed by directly welding tube plates at two ends with a shell. The shell is internally provided with a tube bundle, and the two ends of the tube bundle are fixed on the tube plate by adopting a welding, expansion joint or expansion welding combined method.
One end of the tube plate of the floating head type heat exchanger is fixed between the shell and the tube box, and the other end of the tube plate can move freely in the shell, namely, the shell and the tube bundle can expand freely.
The U-shaped tube type heat exchanger is characterized in that a heat exchange tube bright is in a U shape, and two ends of the heat exchange tube bright are fixed on the same tube plate. Because casing and heat exchange tube are separately, the heat exchange tube bank can freely stretch out and draw back, can not produce the temperature difference stress because of the difference in temperature of medium.
And a hot flue gas inlet 206 for introducing high-temperature hot flue gas of the internal combustion engine into the tubular heat exchanger 203.
And a cold flue gas outlet 207 for discharging the low-temperature cold flue gas after heat exchange.
And a first input end of the evaporator 204 is connected with the tubular heat exchanger 203, a second input end of the evaporator is connected with the liquefied natural gas inlet 208, a first output end of the evaporator is connected with the heater 205, and a second output end of the evaporator is connected with the heater to evaporate the liquefied natural gas into gaseous natural gas.
Alternatively, the evaporator 204 may be a plate heat exchanger or a tube heat exchanger.
And a heater 205, a first input end of which is connected with the evaporator 204, a second input end of which is connected with the evaporator 204, a first output end of which is connected with the expansion cabinet 201, and a second output end of which is connected with the gaseous natural gas outlet 209, and further heats the gasified natural gas.
Alternatively, the heater 205 may be a plate heat exchanger or a tube heat exchanger.
Further, the heater 205 is a bellows or a fin tube for enhancing heat transfer outside the tube.
Further, a check valve is disposed between the water-glycol pump 202 and the tubular heat exchanger 203.
The check valve is a valve with a circular valve clack and acts by self weight and medium pressure to block the medium from flowing backwards, and the stop valve of the utility model is used for preventing water-glycol from flowing backwards.
Furthermore, a shutoff valve is arranged between the tubular heat exchanger 203 and the evaporator 204.
A stop valve is also arranged between the tubular heat exchanger 203 and the hot flue gas inlet 206.
A stop valve is also arranged between the tubular heat exchanger 203 and the cold flue gas outlet 207.
The utility model discloses in, the stop valve is closed when the heat exchanger maintenance as the valve for the maintenance. The stop valve, also called stop valve, is one of the most widely used valves, because the friction force between the sealing surfaces is small in the opening and closing process, the stop valve is relatively durable, the opening height is small, the stop valve is easy to manufacture, the maintenance is convenient, and the stop valve is not only suitable for medium and low pressure, but also suitable for high pressure.
Furthermore, the system can control the temperature and the flow of the water-glycol according to the evaporation and gasification amount.
Further, a ball valve is disposed between the evaporator 204 and the heater 205 for regulating and controlling the fluid.
The utility model provides a novel circulation heating vaporization system's work flow as follows:
a water-glycol pump 202 delivers low temperature water-glycol from the expansion tank 201 to a first input of a tubular heat exchanger 203;
the low-temperature water-glycol in the tubular heat exchanger 203 exchanges heat with the hot flue gas to form high-temperature water-glycol, and the high-temperature water-glycol is output from the first output end of the tubular heat exchanger 203.
The first input end of the evaporator 204 inputs high-temperature water-ethylene glycol to exchange heat with the liquefied natural gas, and the water-ethylene glycol is output from the first output end of the evaporator 204.
The second input end of the evaporator 204 is connected to the liquefied natural gas inlet 208, and the liquefied natural gas is input to exchange heat with the water-glycol to be evaporated into gaseous natural gas, and the gaseous natural gas is output from the second output end of the evaporator 204.
The first input end of the heater 205 inputs water-ethylene glycol, exchanges heat with the gaseous natural gas, and outputs low-temperature water-ethylene glycol from the first output end of the heater 205 to the expansion cabinet 201 for recycling.
A second input of the heater 205 is for inputting the gaseous natural gas to exchange heat with the water-ethylene glycol to heat the gaseous natural gas, and a second output of the heater is for outputting the further heated gaseous natural gas and for outputting the gaseous natural gas 209.
The novel circulation heating evaporation system provided by the utility model can be used as long as heating is required, for example, the second fluid can be fresh water, so that the fresh water can be heated for the life application of ships; or for a marine denitration system, the second fluid being a catalyst, the catalyst being heated during a cold start, etc.
The utility model provides a novel circulation heating vaporization system utilizes the flue gas after combustion apparatus such as boats and ships host computer, annex, boiler burns to carry out the heat transfer, and circulation heating evaporates liquefied natural gas, practices thrift a large amount of energy and equipment comparatively reliably be difficult for being corroded by the sea water.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The above-described embodiments are provided to enable persons skilled in the art to make or use the invention, and many modifications and variations may be made to the above-described embodiments by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of the invention is not limited by the above-described embodiments, but should be accorded the widest scope consistent with the innovative features set forth in the claims.