阅读说明：本技术 用于氮气和液氮气液混合的装置 (Device for mixing nitrogen gas and liquid ) 是由 袁汝华 杨炳发 孙道青 张奇 崔荣帅 田伟 田炜 崔志勇 韩兵 李月海 于 2020-04-01 设计创作，主要内容包括：本发明公开了一种用于氮气和液氮气液混合的装置,包括罐体、液氮入口管线、氮气入口管线、氮气出口管线和除雾器,所示罐体分别开设有液氮入口和氮气入口,所述液氮入口连通所述液氮入口管线一端,所述液氮入口管线另一端引入液氮,所述氮气入口连通所述氮气入口管线一端,所述氮气入口管线的另一端引入氮气,所述罐体开设有氮气出口,所述氮气出口连通所述氮气出口管线的一端,所述氮气出口管线的另一端排出罐体内的混合气体,本发明解决LNG预冷过程中液氮浪费以及预冷效率低的问题。(The invention discloses a device for mixing nitrogen and liquid nitrogen gas and liquid, which comprises a tank body, a liquid nitrogen inlet pipeline, a nitrogen outlet pipeline and a demister, wherein the tank body is respectively provided with a liquid nitrogen inlet and a nitrogen inlet, the liquid nitrogen inlet is communicated with one end of the liquid nitrogen inlet pipeline, liquid nitrogen is introduced into the other end of the liquid nitrogen inlet pipeline, the nitrogen inlet is communicated with one end of the nitrogen inlet pipeline, nitrogen is introduced into the other end of the nitrogen inlet pipeline, the tank body is provided with a nitrogen outlet, the nitrogen outlet is communicated with one end of the nitrogen outlet pipeline, and the other end of the nitrogen outlet pipeline discharges mixed gas in the tank body.)

1. The utility model provides a device for nitrogen gas and liquid nitrogen gas-liquid mixture, its characterized in that, includes a jar body, liquid nitrogen inlet pipeline, nitrogen gas inlet pipeline and nitrogen gas outlet pipeline, liquid nitrogen inlet and nitrogen gas entry have been seted up respectively to the shown jar body, liquid nitrogen entry intercommunication liquid nitrogen inlet pipeline one end, liquid nitrogen is introduced to the liquid nitrogen inlet pipeline other end, nitrogen gas entry intercommunication nitrogen gas inlet pipeline one end, nitrogen gas is introduced to the other end of nitrogen gas inlet pipeline, the nitrogen gas export has been seted up to the jar body, nitrogen gas export intercommunication the one end of nitrogen gas outlet pipeline, the internal mist of jar is discharged to the other end of nitrogen gas outlet pipeline.

2. The device for mixing the gas and the liquid nitrogen as claimed in claim 1, further comprising a demisting partition, wherein the demisting partition is bent and connected with the inner wall of the tank body to form a semi-closed liquid drop blocking space, the nitrogen outlet is communicated with the semi-closed liquid drop blocking space, and the opening direction formed by the demisting partition and the inner wall of the tank body is arranged in the same direction as the liquid nitrogen inlet.

3. The apparatus according to claim 1, wherein a demister is provided in the nitrogen outlet line.

4. The apparatus according to claim 1, wherein the nitrogen inlet line extends from the nitrogen inlet into the tank body and is communicated with a nitrogen distributor, the nitrogen distributor is provided with a plurality of outlet holes, and the diameter of the outlet holes is gradually increased along a direction away from the nitrogen outlet.

5. The apparatus for gas-liquid mixing of nitrogen and liquid nitrogen according to claim 1, wherein the liquid nitrogen inlet line has one end protruding from the liquid nitrogen inlet into the tank body and communicates with an inlet port of a shower head having a plurality of discharge holes.

6. The apparatus for gas-liquid mixing of nitrogen gas and liquid nitrogen according to claim 1, wherein the liquid nitrogen inlet and the nitrogen gas inlet are disposed opposite to each other.

7. The apparatus for gas-liquid mixing of nitrogen gas and liquid nitrogen according to claim 6, wherein the liquid nitrogen inlet and the nitrogen gas inlet are provided at an upper end and a lower end of the tank, respectively.

8. The apparatus for gas-liquid mixing of nitrogen gas and liquid nitrogen according to claim 7, wherein the nitrogen gas outlet is provided at a side of the tank body, and the nitrogen gas outlet line is provided obliquely upward.

Technical Field

The invention relates to the technical field of LNG pipeline precooling, in particular to a device for mixing nitrogen and liquid nitrogen gas and liquid.

Background

At present, in the precooling process of an LNG pipeline system, the temperature of outlet logistics needs to be adjusted by mixing liquid nitrogen and low-temperature nitrogen in a mixer, the mixed logistics requirement is a gas phase, the outlet of a conventional mixer is not uniformly mixed, liquid nitrogen fog drops are often entrained, the liquid drops are easily accumulated in a pipeline and settle at the bottom of the pipeline due to gravity, the vertical temperature distribution inside the pipeline is not uniform, the judgment of a precooling effect is influenced, the waste of the liquid nitrogen and the precooling efficiency are reduced, and the economic cost and the time cost of precooling work are increased.

Disclosure of Invention

The present invention is intended to solve the above technical problems to some extent.

In view of this, the invention provides a nitrogen and liquid nitrogen gas-liquid mixing device, which solves the problems of liquid nitrogen waste and low pre-cooling efficiency in the LNG pre-cooling process.

In order to solve the technical problem, the invention provides a device for mixing nitrogen and liquid nitrogen gas and liquid, which comprises a tank body, a liquid nitrogen inlet pipeline, a nitrogen inlet pipeline and a nitrogen outlet pipeline, wherein the tank body is respectively provided with a liquid nitrogen inlet and a nitrogen inlet, the liquid nitrogen inlet is communicated with one end of the liquid nitrogen inlet pipeline, liquid nitrogen is introduced into the other end of the liquid nitrogen inlet pipeline, the nitrogen inlet is communicated with one end of the nitrogen inlet pipeline, nitrogen is introduced into the other end of the nitrogen inlet pipeline, the tank body is provided with a nitrogen outlet, the nitrogen outlet is communicated with one end of the nitrogen outlet pipeline, and the other end of the nitrogen outlet pipeline discharges mixed gas in the tank body.

Further, still include the defogging baffle, the defogging baffle is bent and is set up, and the defogging baffle is connected the inner wall of the jar body forms semi-closed liquid drop separation space, nitrogen gas outlet intercommunication semi-closed liquid drop separation space, the defogging baffle with the opening direction that the inner wall of the jar body formed with liquid nitrogen entry direction syntropy sets up.

Further, a demister is arranged in the nitrogen outlet pipeline.

Furthermore, the nitrogen inlet pipeline extends into the tank body from the nitrogen inlet and is communicated with the nitrogen distributor, the nitrogen distributor is provided with a plurality of air outlets, and the aperture of the plurality of air outlets is gradually increased along the direction far away from the nitrogen outlet.

Further, one end of the liquid nitrogen inlet pipeline extends into the tank body from the liquid nitrogen inlet and is communicated with the inlet of the spray head, and the spray head is provided with a plurality of discharge holes.

Further, the liquid nitrogen inlet and the nitrogen inlet are oppositely arranged.

Further, the liquid nitrogen inlet and the nitrogen inlet are respectively arranged at the upper end and the lower end of the tank body.

Further, the nitrogen outlet is arranged at the side part of the tank body, and the nitrogen outlet pipeline is arranged obliquely upwards.

The invention has the technical effects that: the device can realize the high-efficiency mixing of gas phase and liquid phase, reduces the generation of liquid drops to a greater extent, can save the use of liquid nitrogen in the precooling process to a greater extent, and simultaneously improves the efficiency of the liquid nitrogen precooling work.

Drawings

FIG. 1 is a schematic view of the structure of an apparatus for gas-liquid mixing of nitrogen and liquid nitrogen according to the present invention;

FIG. 2 is a schematic view showing the structure of a nitrogen distributor according to the present invention, which is a schematic view showing the structure of an apparatus for gas-liquid mixing of nitrogen and liquid nitrogen.

Wherein 1-liquid nitrogen inlet line; 2-a spray header; 3-demisting partition boards; 4-nitrogen outlet line; 5-a demister; 6-nitrogen inlet line; 7-tank body; 8-nitrogen distributor; 9-air outlet.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

As shown in fig. 1, a device for mixing nitrogen gas and liquid nitrogen comprises a tank body 7, a liquid nitrogen inlet pipeline 1, a nitrogen gas inlet pipeline 6 and a nitrogen gas outlet pipeline 4, wherein a liquid nitrogen inlet and a nitrogen gas inlet are respectively formed in the tank body 7, the liquid nitrogen inlet is communicated with one end of the liquid nitrogen inlet pipeline 1, liquid nitrogen is introduced into the other end of the liquid nitrogen inlet pipeline 1, the nitrogen gas inlet is communicated with one end of the nitrogen gas inlet pipeline 6, nitrogen gas is introduced into the other end of the nitrogen gas inlet pipeline 6, a nitrogen gas outlet is formed in the tank body 7, the nitrogen gas outlet is communicated with one end of the nitrogen gas outlet pipeline 4, and.

According to the specific embodiment of the invention, the device for mixing the nitrogen gas and the liquid nitrogen comprises a tank body 7, a liquid nitrogen inlet pipeline 1, a nitrogen gas inlet pipeline 6 and a nitrogen gas outlet pipeline 4, wherein the tank body 7 is provided with a liquid nitrogen inlet which is communicated with one end of the liquid nitrogen inlet pipeline 1, liquid nitrogen is introduced into the other end of the liquid nitrogen inlet pipeline 1, the liquid nitrogen enters the tank body 7 from the liquid nitrogen inlet pipeline 1 and is gasified into the nitrogen gas in the tank body 7, the tank body 7 is respectively provided with nitrogen gas inlets which are communicated with one end of the nitrogen gas inlet pipeline 6, the nitrogen gas is introduced into the other end of the nitrogen gas inlet pipeline 6, the nitrogen gas enters the tank body 7 from the nitrogen gas inlet pipeline 6 and is mixed with the gasified nitrogen gas in the tank body 7 to form low-temperature nitrogen gas, the nitrogen gas outlet is communicated with one end of the nitrogen gas outlet pipeline 4, the other end of the nitrogen gas, meanwhile, the temperature of the nitrogen entering the nitrogen outlet pipeline 4 is adjusted by controlling the ratio of the gas-liquid two-phase efficient mixing entering amount, the use of liquid nitrogen in the precooling process is saved, the LNG pipeline precooling work is carried out, and the device has the characteristics of simple structure, convenience in operation, economy and practicability.

As shown in figure 1, a device for nitrogen gas and liquid nitrogen gas-liquid mixture still includes defogging baffle 3, and defogging baffle 3 bends and sets up to the inner wall that defogging baffle 3 connects jar body 7 forms semi-closed liquid drop separation space, and the semi-closed liquid drop separation space of nitrogen gas export intercommunication, the opening direction and the liquid nitrogen entry direction syntropy setting that defogging baffle 3 and jar internal wall of body 7 formed.

According to the embodiment of the invention, the device for mixing the nitrogen gas and the liquid nitrogen gas further comprises the demisting partition plate 3, the low-temperature nitrogen gas formed by mixing collides with the demisting partition plate 3 before entering the nitrogen gas outlet and is attached to the demisting partition plate 3, liquid nitrogen fog drops are prevented from directly entering the nitrogen gas outlet pipeline 4, the fog drops are prevented from being attached to an LNG pipeline, the problem that the temperature distribution of the nitrogen gas outlet pipeline 4 is uneven due to gasification of the fog drops is avoided, the using amount of the liquid nitrogen is saved, the economical efficiency is improved, the construction period is saved, and the working efficiency is improved.

Specifically, defogging baffle 3 includes first defogging baffle and the second defogging baffle of mutually perpendicular connection, and first defogging baffle is on a parallel with the liquid nitrogen entry setting, and connects the inner wall of jar body 7.

As shown in fig. 1, a demister 5 is provided in the nitrogen outlet line 4.

According to the specific embodiment of the invention, the demister 5 is arranged in the nitrogen outlet pipeline 4, and the condition that the cooling temperature is not uniform due to the fact that the nitrogen outlet pipeline 4 is gasified by fog drops of low-temperature nitrogen in the nitrogen outlet pipeline 4 is avoided.

As shown in fig. 2, the nitrogen inlet pipeline 1 extends into the tank 7 from the nitrogen inlet and is communicated with the nitrogen distributor 8, the nitrogen distributor 8 is provided with a plurality of air outlets 9, and the aperture of the plurality of air outlets 9 is gradually increased along the direction far away from the nitrogen outlet.

According to the specific embodiment of the invention, the nitrogen distributor 8 is provided with the plurality of air outlet holes 9, the aperture of the plurality of air outlet holes 9 is gradually increased along the direction far away from the nitrogen outlet, a large amount of nitrogen is discharged from one side with large aperture, the nitrogen is prevented from entering the nitrogen outlet pipeline 4 directly from the opening formed by the demisting partition plate 3 and the inner wall of the tank body 7, and the stable demisting operation is ensured.

Specifically, the plurality of air outlets 9 are distributed on the nitrogen distributor 8 in 3 straight lines.

Specifically, the nitrogen distributor 8 is a closed shell structure.

As shown in fig. 1, a liquid nitrogen inlet line 1 extends from a liquid nitrogen inlet into a tank 7 at one end and communicates with an inlet port of a shower head 2, and the shower head 2 has a plurality of discharge holes.

According to the embodiment of the invention, liquid nitrogen forms liquid spray through a plurality of discharge holes of the spray header 2 and is uniformly sprayed inside the tank body 7, so that the liquid nitrogen enters the tank body 7 and is rapidly gasified.

As shown in fig. 1, the liquid nitrogen inlet and the nitrogen gas inlet are disposed opposite to each other.

According to the embodiment of the present invention, liquid nitrogen and nitrogen gas are sufficiently mixed after entering the tank 7.

As shown in fig. 1, a liquid nitrogen inlet and a nitrogen gas inlet are provided at the upper end and the lower end of the tank 7, respectively.

According to the specific embodiment of the invention, liquid nitrogen enters the tank body 7 from the liquid nitrogen inlet and moves downwards under the action of gravity, and nitrogen enters the tank body 7 from the nitrogen inlet and moves upwards, so that the liquid nitrogen and the nitrogen are fully mixed to form mixed gas at a certain temperature.

As shown in fig. 1, the nitrogen outlet is provided at the side of the tank 7, and the nitrogen outlet line 4 is provided obliquely upward.

According to the embodiment of the invention, the mixed gas enters the nitrogen outlet pipeline 4 at the side part of the tank body 7 from the nitrogen outlet pipeline 4, and the uniformly mixed gas enters the nitrogen outlet pipeline 4.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.