CN206146267U - Adopt LNG vaporizer of middle medium of self -loopa - Google Patents

Abstract

The utility model discloses an LNG vaporizer adopting a self-circulating intermediate medium, which comprises a casing, and the casing adopts a first partition board and a second partition board respectively provided with multiple rows and columns of through holes, which are sequentially divided into two partitions. The top of the shell is provided with the LNG heat exchange chamber with the inlet and outlet, the first heat exchange medium heat exchange chamber and the left and right side walls with the second heat exchange medium heat exchange chamber with the inlet and outlet; the first insulation The first heat pipe that runs through the LNG heat exchange chamber and the first heat exchange medium heat exchange chamber is fixedly installed in the through hole of the plate, and the first heat pipe that passes through the first heat exchange medium heat exchange chamber and the first heat exchange medium heat exchange chamber is fixedly installed in the through hole of the second partition. The second heat pipe of the second heat exchange medium heat exchange cavity. The utility model has the advantages of simple structure and reliable operation, and effectively solves the problems of freezing of the heat exchange medium caused by the vaporization of low-temperature LNG at -163°C, and deterioration of the vaporization performance of the vaporizer.

Description

A LNG vaporizer using self-circulating intermediate medium

technical field

The utility model relates to a vaporizer, in particular to an LNG vaporizer using a self-circulating intermediate medium, and belongs to the field of heat exchangers.

Background technique

With the further tension of the world's energy structure and the increasingly serious environmental pollution, people are paying more and more attention to the development and utilization of new energy sources. Natural gas is becoming more and more popular as a clean and efficient energy source. Natural gas is a gas at room temperature, which is not convenient for storage and long-distance transportation. Therefore, it is generally used to convert it into a low-temperature liquid (LNG) at -163°C, and then store and long-distance transportation. But before using LNG, it is necessary to use a vaporization device to heat up the liquid LNG at a temperature of about -163°C to gaseous natural gas (NG) at about 5°C.

At present, vaporizers used for LNG vaporization mainly include the following types:

(1) Open-frame vaporizer, that is, LNG flows in the heat transfer tube of the device, and there is a seawater spraying device outside the tube to spray seawater on the heat transfer tube to realize the heat exchange between seawater and LNG; the device has a simple structure and a large heat transfer volume Large, direct use of seawater and LNG for heat exchange, but because LNG has a large temperature difference in sensible heat exchange during the heat exchange process, and releases a large amount of cooling, it is easy to cause seawater to freeze, so the stability of the vaporization efficiency of this device cannot be guaranteed.

(2) A vaporizer with an intermediate heat transfer medium, that is, LNG exchanges heat with the intermediate heat transfer medium, and the intermediate heat transfer medium exchanges heat with seawater (or other heat sources). Since the intermediate heat transfer medium uses a medium with a low freezing point, it ensures The stable operation of the system; however, due to the need to increase the device for intermediate flow, the device structure is complicated.

(3) Shell-and-tube vaporizer. Although the vaporizer has a compact structure, due to the low heat exchange efficiency of the shell-and-tube type and the large flow rate of the heat source, it cannot guarantee the stable vaporization of LNG.

The patent application number 201510313021.3 discloses an LNG vaporizer using cascade vaporization technology. The system is mainly composed of a shell, a partition, and a number of heat pipes. Among them: two porous partitions divide the shell into three cavities, The two ends of the upper chamber correspond to the NG outlet and the LNG inlet respectively, the two ends of the middle chamber correspond to the first heat exchange medium outlet and the first heat exchange medium inlet respectively, and the two ends of the lower chamber correspond to the second heat exchange medium inlet and the second heat exchange medium respectively. Heat exchange medium outlet. The heat pipes are vertically and fixedly installed on two partitions respectively, and pass through three different cavities. The cold energy of the LNG is transferred to the first heat exchange medium through the heat pipe, and the first heat exchange medium then transfers the cold energy to the second heat exchange medium through the heat pipe. In order to ensure that the first heat exchange medium circulates in the heat exchange chamber of the first heat exchange medium, the invention needs to be equipped with a corresponding power cycle device and circulation pipeline, which not only increases the energy loss and cost of the device, but also makes the whole device As complexity goes up, reliability goes down.

Contents of the invention

The purpose of the utility model is to provide an LNG vaporizer using a self-circulating intermediate medium for the defects of functional limitations in the above-mentioned prior art.

The vaporizer of the utility model utilizes the buoyancy force after the first heat exchange medium absorbs the heat of the second heat exchange medium to vaporize and absorbs the gravity of LNG coldness condensed into liquid, so as to promote the first heat exchange medium to be in the heat exchange chamber of the first heat exchange medium. Up and down self-circulating flow is generated in 9, the structure is simple and no additional power is required.

In order to achieve the above object, the utility model adopts the following technical solutions:

An LNG vaporizer using a self-circulating intermediate medium, comprising a casing 4, the casing 4 adopts a first partition 7 and a second partition 10 with multiple rows and columns of through holes, which are sequentially separated The top of the shell 4 is provided with the LNG heat exchange chamber 6 with the inlet and outlet, the first heat exchange medium heat exchange chamber 9 and the left and right side walls with the second heat exchange medium heat exchange chamber 13 with the inlet and outlet; The first heat pipe 2 passing through the LNG heat exchange chamber 6 and the first heat exchange medium heat exchange chamber 9 is fixedly installed in the through hole of the first partition 7; A heat exchange medium heat exchange chamber 6 and a second heat pipe 12 in a second heat exchange medium heat exchange chamber 13 .

Further, the above-mentioned first heat pipe 2 runs through the outer wall of a section of the LNG heat exchange chamber 6 and the second heat pipe 12 passes through the outer wall of a section of the second heat exchange medium heat exchange chamber 13 along the axial direction. Several horizontal fins 3 are fitted; the first heat pipe 2 and the second heat pipe 12 pass through the outer wall of a section of the first heat exchange medium heat exchange chamber 9 and several vertical fins 8 are fitted along the circumference.

Further, the above-mentioned first partition plate 7 and the second partition plate 10 are connected to the housing 4 by welding. The through holes on the first separator 7 and the second separator 10 are arranged in a staggered or sequential arrangement.

Further, the length of the first heat pipe 2 and the second heat pipe 12 passing through the first heat exchange medium heat exchange cavity 9 is less than 1/2 of the volume height of the first heat exchange medium heat exchange cavity 9 . The first heat exchange medium heat exchange cavity 9 is a closed cavity with an internal pressure equal to 100Pa-200Pa, and the condensation end of the submerged second heat pipe 12 is stored in the cavity and does not exceed the volume height of the first heat exchange medium heat exchange cavity 9 1/2 of the low boiling point working fluid.

The first heat exchange medium described in the utility model directly exchanges heat with the LNG through the heat pipe. Since the LNG releases a large amount of cold when it is vaporized, in order to ensure that the first heat exchange medium does not freeze during the heat exchange process, a low The boiling-point phase-change heat medium is such as propane; and the second heat-exchange medium does not need to consider the above-mentioned problems, that is, a general heat-exchange medium can be used, such as sea water. In order to ensure that the three media can exchange heat and gradually increase the temperature of LNG, the LNG and the second heat exchange medium flow in reverse.

According to the vaporization characteristics of the LNG vaporization process, the utility model ensures the stable progress of LNG vaporization by rationally combining and arranging the evaporation ends and condensation ends of heat pipes in different heat exchange chambers; A heat pipe 2 and the second heat pipe 12 placed in the first heat exchange medium heat exchange chamber 9 are the condensation ends of the heat pipe; the first heat pipe 2 placed in the first heat exchange medium heat exchange chamber 9 and the second heat exchange pipe The second heat pipe 12 in the heat medium heat exchange chamber 13 is the evaporation end of the heat pipe.

The second heat exchange medium described in the present invention flows in the second heat exchange medium heat exchange cavity 13, and exchanges heat with the evaporation end of the second heat pipe 12, and the evaporation end of the second heat pipe 12 absorbs heat from the second heat exchange medium and transfer the heat to the first heat exchange medium through its condensing end; the first heat exchange medium absorbs heat and vaporizes from a liquid state to a gaseous state, and the gaseous first heat exchange medium exchanges heat with the evaporation end of the first heat pipe 2 and Heat is transferred to the LNG through its condensing end.

Description of drawings

Fig. 1 is the structural representation of the utility model patent;

In the figure: 1. NG outlet; 2. First heat pipe; 3. Horizontal fins; 4. Shell; 5. LNG inlet 6. LNG heat exchange chamber; 7. First partition; 8. Vertical fins; 9 1. First heat exchange medium heat exchange chamber; 10. Second partition; 11. Second heat exchange medium outlet; 12. Second heat pipe; 13. Second heat exchange medium heat exchange chamber; 14. Second heat exchange medium Export.

detailed description

Below in conjunction with the accompanying drawings and specific embodiments, the utility model is described in further detail, but the scope of protection of the utility model is not limited to the following embodiments, and all technical solutions obtained in the form of equivalent replacement or equivalent transformation are protected by the utility model. within range.

As shown in accompanying drawing 1, it is a kind of LNG carburetor adopting self-circulating intermediate medium of the present utility model, comprises shell 4, adopts the first dividing plate 7 that has multiple rows and columns of through holes in said shell 4 and the second partition plate 10, which are sequentially divided into an LNG heat exchange chamber 6 with inlets and outlets correspondingly provided on the top of the shell 4, a first heat exchange medium heat exchange chamber 9, and a chamber with inlets and outlets provided on the left and right side walls. The second heat exchange medium heat exchange chamber 13; the first heat pipe 2 passing through the LNG heat exchange chamber 6 and the first heat exchange medium heat exchange chamber 9 is fixedly installed in the through hole of the first partition plate 7; the second The second heat pipe 12 passing through the first heat exchange medium heat exchange cavity 6 and the second heat exchange medium heat exchange cavity 13 is fixedly installed in the through hole of the separator 10 . Wherein, the first heat pipe 2 penetrates on the outer wall of a section of the LNG heat exchange chamber 6 and the second heat pipe 12 penetrates on the outer wall of a section of the second heat exchange medium heat exchange chamber 13, respectively sleeved in the axial direction There are a number of horizontal fins 3; the first heat pipe 2 and the second heat pipe 12 run through a section of the outer wall of the first heat exchange medium heat exchange chamber 9, and a number of vertical fins 8 are sleeved along the circumference. The first partition 7 and the second partition 10 are connected to the housing 4 by welding. The through holes on the first separator 7 and the second separator 10 are arranged in a staggered or sequential arrangement. The length of a section of the first heat pipe 2 and the second heat pipe 12 passing through the first heat exchange medium heat exchange cavity 9 is less than 1/2 of the volume height of the first heat exchange medium heat exchange cavity 9 . The first heat exchange medium heat exchange cavity 9 is a closed cavity with an internal pressure equal to 100Pa-200Pa, and the condensation end of the submerged second heat pipe 12 is stored in the cavity and does not exceed the volume height of the first heat exchange medium heat exchange cavity 9 1/2 of the low boiling point working fluid.

A kind of realization method of the LNG vaporizer adopting the self-circulating intermediate medium of the present utility model, the flow process is as follows:

1. LNG heat exchange process: LNG flows from the LNG inlet 5 into the LNG heat exchange chamber 6 to exchange heat with the condensation end of the first heat pipe 2, and absorb the heat obtained by the low boiling point working medium in the heat pipe from the first heat exchange medium so that the temperature rises High, the temperature of LNG at -163°C is raised to normal temperature NG, and then discharged from NG outlet 1 to complete the vaporization process of LNG.

2. The heat exchange process of the first heat exchange medium: the liquid first heat exchange medium in the heat exchange chamber 9 performs heat exchange with the condensation end of the second heat pipe 12, and absorbs the low boiling point working medium in the heat pipe from the second heat exchange medium. Second, the heat absorbed by the heat exchange medium is vaporized to generate buoyancy. The gaseous first heat exchange medium keeps rising, exchanges heat with the evaporation end of the first heat pipe 2 in the first heat exchange medium heat exchange cavity 9, absorbs the cold energy from LNG, and condenses into liquid when the temperature drops. The liquid first heat exchange medium flows back down along the outer wall of the vertical fin 8 of the first heat pipe 2 under the action of gravity, and finally flows back to the bottom of the first heat exchange medium heat exchange chamber 9. The liquid first heat exchange medium Continue to absorb heat and vaporize into a gaseous state, and the process repeats itself.

3. The heat exchange process of the second heat exchange medium: the second heat exchange medium flows into the second heat exchange medium heat exchange cavity 13 from the second heat exchange medium inlet 14 to exchange heat with the evaporation end of the second heat pipe 12, and provides heat Supply the first heat exchange medium so that the temperature of the first heat exchange medium rises and vaporizes; by adjusting the flow rate of the second heat exchange medium entering the heat exchange chamber 13 of the second heat exchange medium, it matches the vaporization amount of LNG to realize real-time working conditions adjustment.

The above is only the embodiment of the utility model, and its description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the utility model. It should be pointed out that, for those skilled in the art, any technical solution formed by equivalent replacement or equivalent transformation shall fall within the scope of protection required by the utility model without departing from the concept of the utility model.

Claims (3)

1. a kind of LNG vaporization device of employing self-loopa intermediate medium, including housing (4), it is characterised in that：In the housing (4) Using the first dividing plate (7) and second partition (10) that offer multiple lines and multiple rows through hole respectively, by it successively every being divided in housing (4) Top is correspondingly arranged on LNG heat exchanging chambers (6), the first heat transferring medium heat exchanging chamber (9) and the left and right sidewall of import and export and is correspondingly arranged on Second heat transferring medium heat exchanging chamber (13) of import and export；It is installed with the through hole of first dividing plate (7) through LNG heat exchange Chamber (6) and first heat pipe (2) of the first heat transferring medium heat exchanging chamber (9), are installed with the through hole of the second partition (10) Through the first heat transferring medium heat exchanging chamber (9) and second heat pipe (12) of the second heat transferring medium heat exchanging chamber (13), first dividing plate (7) through hole and on second partition (10) be arranged as staggeredly or in-line arrangement arrangement；First heat pipe (2) and the second heat pipe (12) The length of a section be applied in the first heat transferring medium heat exchanging chamber (9) is respectively less than the first heat transferring medium heat exchanging chamber (9) volume The 1/2 of height；The first heat transferring medium heat exchanging chamber (9) is equal to the airtight cavity of 100Pa-200Pa for internal pressure, in cavity If storage have the heat pipe of submergence second (12) condensation end and less than the first heat transferring medium heat exchanging chamber (9) volume height 1/2 it is low Boiling point working medium.

2. the LNG vaporization device of employing self-loopa intermediate medium according to claim 1, it is characterised in that：Described first is hot Manage on one section that (2) are applied in LNG heat exchanging chambers (6) of outer wall and second heat pipe (12) is applied in the second heat transferring medium and changes Each it is set with some horizontal fins (3) on the outer wall of a section in hot chamber (13) vertically；First heat pipe (2) and second Some vertical fins are circumferentially set with the outer wall of be applied in the first heat transferring medium heat exchanging chamber (9) one section of heat pipe (12) (8)。

3. the LNG vaporization device of employing self-loopa intermediate medium according to claim 1, it is characterised in that：Described first every Plate (7) and second partition (10) and the connection of the housing (4) are to be welded to connect.