CN114413653A - Natural gas phase-change heat exchange device and temperature control system and constant pressure system applied to same - Google Patents

Abstract

The invention discloses a natural gas phase-change heat exchange device and a temperature control system and a constant pressure system applied to the same, belonging to the technical field of offshore oil drilling devices; the device comprises a shell, wherein a coil pipe mechanism for heat exchange is arranged in the shell, the coil pipe mechanism is provided with an air inlet and an air outlet for a natural gas flow, the shell is provided with a steam inlet and a liquid outlet, and steam enters a tank body and then exchanges heat with natural gas in the coil pipe, is cooled to form liquid and is discharged from the liquid outlet; the natural gas heating is realized by adopting a mode of heating the natural gas by steam, and in the aspect of taking the steam, the required energy can be taken from surplus steam of the offshore drilling platform as a heat source to heat the natural gas according to the actual situation, so that the corresponding energy is fully utilized, the energy consumption can be effectively reduced, and the cost is further reduced.

Description

Natural gas phase-change heat exchange device and temperature control system and constant pressure system applied to same

Technical Field

The invention relates to a natural gas phase-change heat exchange device and a temperature control system and a constant pressure system applied to the natural gas phase-change heat exchange device, and belongs to the technical field of offshore oil drilling devices.

Background

In the process of exploiting the natural gas of the ocean platform, the temperature of the natural gas is reduced due to reasons such as throttling control production and the like of the wellhead high-pressure natural gas, so that the problems of icing, ice blockage and the like of hydrates in the natural gas are easily caused, and the safety production of the natural gas is influenced. The natural gas is generally heated before throttling and depressurizing, the temperature is raised, and the natural gas is cooled after throttling and depressurizing so as not to freeze, thereby solving the problem of ice blockage and simultaneously improving the oil-gas separation efficiency in the subsequent process.

The natural gas heating device mainly comprises a natural gas electric heater and a natural gas water jacket heating furnace.

Firstly, the natural gas electric heater is schematically shown in fig. 7, the natural gas electric heater is powered on by an electric heating tube to generate heat, and low-temperature natural gas coats the electric heating tube to be directly heated so as to meet the requirement of technological temperature parameters. Among them, its advantage is that the electric energy is directly converted into the heat energy, heat the high-pressure low-temperature natural gas, the heating rate is fast, the thermal efficiency is high; the problem of environmental pollution caused by the emission of tail gas and sewage is solved. But the problems of large power load, large power consumption, high production and operation cost and high explosion-proof requirements on electrical appliances exist, and meanwhile, the outer shell of the high-pressure container is in a high-pressure and low-temperature working condition, the materials are special, the size of equipment such as a flange and a flange cover is large, the pressure level is high, the high-pressure container belongs to special equipment, and special requirements are provided for safe use. Generally, the power station is mainly used for stations with abundant power supply and suitable for special equipment.

Secondly, the natural gas water jacket heating furnace is schematically shown in fig. 8, and the natural gas water jacket heating furnace heats water by using natural gas combustion, and then the hot water heats high-pressure low-temperature natural gas flowing through the coil pipe to meet the requirements of technological temperature parameters. Among them, its advantage is to utilize the natural gas as the fuel to burn, has reduced the fuel cost; boiler water (non-combustible medium) is directly heated through a hearth and a smoke and fire tube, low-temperature natural gas (explosive dangerous medium) is indirectly heated by the boiler water, and high-pressure natural gas flows in a coil pipe with a small cross section, so that the boiler is safe and reliable, and is not governed by special equipment. However, due to indirect heat exchange of fire, water and gas, the heat transfer coefficient is small, the heat efficiency is low, and devices with the same power have large volume and large occupied space; the combustion has smoke emission and the boiler water has sewage emission, so that certain pollution is caused to the environment; the display and control are delayed due to indirect heating, and the precision is not high; open fire exists in combustion, and the requirement on a fire boundary in an explosion-proof subarea environment is strict; generally, the method is used for land station yards and open-space non-explosion-proof areas.

Disclosure of Invention

The invention aims to: in view of the above problems, the present invention provides a natural gas heat exchange device, and a temperature control system and a constant pressure system applied thereto, which can fully utilize the heat energy of steam, improve the heating efficiency of natural gas, and achieve better cost reduction.

The technical scheme adopted by the invention is as follows:

the utility model provides a natural gas phase transition heat exchange device, includes the casing, the inside coil pipe mechanism that is used for the heat exchange that is provided with of casing, coil pipe mechanism is provided with air inlet and gas outlet in order to be used for the flow of natural gas, be provided with steam inlet and leakage fluid dram on the casing, steam enters into jar internal back and carries out the cooling formation liquid and follow the leakage fluid dram discharge after the heat exchange with the natural gas in the coil pipe.

Further, a gas distribution mechanism is arranged in the shell where the steam inlet is located and used for diffusion of steam.

Further, the gas distribution mechanism comprises a distribution hole pipe communicated with the steam inlet, a plurality of distribution air holes are formed in the distribution hole pipe and used for exhausting steam, and two end portions of the distribution hole pipe are sealing structures.

Furthermore, two end parts of the distribution hole pipe are sealed by adopting blind plates.

Further, the outside of distribution hole pipe still is provided with the fender liquid board, the fender liquid board is provided with a plurality of gas pockets in order to be used for the passing through of steam, the fender liquid board passes through the backup pad and fixes the assembly on distribution hole pipe.

Further, the liquid outlet is arranged at the lower part of the shell, and the steam inlet is arranged at the lower part or the upper part of the shell.

Further, coil pipe mechanism includes first coil pipe and second coil pipe, be provided with the choke valve between first coil pipe and the second coil pipe, through choke valve throttle step-down, heat absorption cooling.

Further, first coil pipe sets up in the below of second coil pipe to set up in the inside cavity of casing, the air inlet sets up on first coil pipe, the gas outlet sets up on the second coil pipe.

Further, the steam inlet is connected with a steam pipeline;

a pressure regulator and a pressure regulating valve are arranged on the steam pipeline, and the pressure regulator controls the pressure regulating valve to control the pressure of the steam;

or/and a temperature regulator and a temperature regulating valve are arranged on the steam pipeline, and the temperature regulating valve is controlled by the temperature regulator to control the temperature of the heat exchange of the natural gas

Furthermore, the liquid discharge port is communicated with a liquid discharge pipe, and an automatic drain valve is arranged on the liquid discharge pipe.

A temperature control system is characterized in that a steam inlet is communicated with a steam pipeline, and a temperature regulating valve is arranged on the steam pipeline;

the temperature sensor is arranged at the air outlet, the temperature regulator and the valve positioner are used for controlling the temperature regulator;

the temperature regulator gives a signal to the valve positioner through a detection signal of the temperature sensor and realizes the control of the temperature regulator valve.

Further, the temperature regulator is a pneumatic temperature regulator, the valve positioner is a pneumatic valve positioner, the temperature regulating valve is a pneumatic membrane regulating valve, and the temperature sensor is an expansion type temperature sensor;

the pneumatic temperature regulator is provided with an air inlet, the expansion type temperature sensor controls the size of an air pressure signal output to the pneumatic valve positioner after sensing the temperature of fluid, and the opening control of the pneumatic film regulating valve is realized through the pneumatic valve positioner.

A constant pressure steam pressure control system is characterized in that a steam inlet is communicated with a steam pipeline, and a pressure regulating valve is arranged on the steam pipeline;

the steam generator also comprises a pressure regulator, wherein the pressure regulator is communicated with the interior of the shell through a sensing element and controls the pressure regulating valve through detection of the steam pressure in the shell.

Further, the pressure regulator is a pneumatic pressure regulator, the pressure regulating valve is a pneumatic membrane regulating valve, and the sensing element is a bourdon tube;

the pneumatic pressure regulator is provided with an air inlet, detects the steam pressure through the Bourdon tube, and controls the output pressure signal of the pneumatic pressure regulator through the change of the Bourdon tube so as to control the opening degree of the pressure regulating valve.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device realize natural gas heating by adopting a mode of heating natural gas by steam, and water resources are relatively abundant when the steam is taken and particularly applied to an ocean drilling platform, the surplus steam of the ocean drilling platform is fully utilized as a heat source to heat the natural gas, so that the energy consumption can be effectively reduced, and the production cost can be reduced;

2. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system applied to the natural gas phase-change heat exchange device are designed through the coil pipe, and the natural rising performance of steam is combined, so that the heat utilization of the steam can be effectively realized in the whole shell cavity, on one hand, the steam is condensed into water drops when meeting the condensation, the gas state is changed into the liquid state, a large amount of latent heat is released, and then the heat exchange is carried out between high-temperature water and low-temperature natural gas, so that the overall film transfer coefficient is very large, and the heat transfer efficiency is high; on the other hand, due to the high heat transfer coefficient of the phase change heat exchange, the corresponding heat exchange area is greatly reduced, the size of the device with the same power is greatly reduced, the occupied space is small, and the use advantage on the limited space of the ocean platform is obvious;

3. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device adopt dividing wall type heat exchange, surplus steam meets condensation and is condensed into water, an automatic drain valve is arranged on a condensed water pipeline, condensed water in a container can be automatically discharged and flows back to a boiler heating system through the system, the condensed water can be recycled, and the whole device meets the environment-friendly requirement of zero emission;

4. according to the natural gas phase-change heat exchange device, the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device, the steam distributor and the baffle are arranged through the steam inlet, so that direct erosion of high-temperature steam is prevented, the steam is uniformly distributed, the natural gas phase-change heat exchange device is fully contacted with the outer wall of the heat exchange coil, and the heat transfer effect is enhanced;

5. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device adopt the pneumatic temperature control system and the constant pressure system, control the opening and closing of the steam pressure source, are synchronous with the actual working condition, have high precision, sensitive action and quick response, and ensure that the technological parameters and the safe operation of a container are achieved; after the parameter setting is completed, the whole device can realize unattended operation, the working intensity of workers is reduced, the technical process has no open fire, no special requirement on electricity is required, the requirement on explosion-proof grade is not high, and the device is safer to use.

Drawings

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

FIG. 2 is a schematic diagram of the present invention;

FIG. 3 is a schematic structural view of the vapor distribution mechanism of the present invention;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a schematic diagram of the temperature control system of the present invention;

FIG. 6 is a schematic diagram of the constant pressure system of the present invention;

FIG. 7 is a schematic structural view of an electric natural gas heater;

fig. 8 is a natural gas water jacket furnace.

The labels in the figure are: 1-shell, 2-air inlet, 3-air outlet, 4-steam inlet, 5-liquid outlet, 6-gas distribution mechanism, 61-distribution hole pipe, 62-distribution air hole, 63-blind plate, 64-liquid baffle, 65-support plate, 7-first coil pipe, 8-second coil pipe, 9-throttle valve, 10-steam pipeline, 11-pressure regulator, 12-pressure regulating valve, 13-temperature regulator, 14-temperature regulating valve, 15-liquid outlet pipe, 16-automatic drain valve, 17-temperature sensor, 18-valve positioner and 19-pressure guiding pipe.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

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

Example 1

The utility model provides a natural gas phase transition heat exchange device, as shown in fig. 1 to 6, includes casing 1, casing 1 is inside to be provided with the coil pipe mechanism that is used for the heat exchange, coil pipe mechanism is provided with air inlet 2 and gas outlet 3 in order to be used for the flow of natural gas, be provided with steam inlet 4 and leakage fluid dram 5 on casing 1, steam enters into jar internal back and carries out the cooling formation liquid and follow the leakage fluid dram 5 discharge after the heat exchange with the natural gas in the coil pipe.

In this embodiment, in the design of whole structure, utilize steam as the source of natural gas heating, when it was applied to ocean drilling platform in, the source of steam can be used as heating steam from platform self surplus steam, and as the in-process of steam heating, the steam liquefaction can release a large amount of heats with cooling down, steam heating coil mechanism simultaneously, its distribution is comparatively more even, simultaneously also further can effectively guarantee the heating effect of natural gas.

Based on the above design of the specific structure, as a more specific description, in another specific embodiment, a gas distribution mechanism 6 is disposed inside the housing 1 where the steam inlet 4 is located for diffusion of steam. In the design of the structure, because the steam belongs to high-temperature gas, the mode can effectively avoid the steam from being directly sprayed on the same position of the coil pipe, and the direct erosion of the high-temperature steam is prevented.

On the basis of the above specific structure, the gas distribution mechanism 6 is further designed to include a distribution hole pipe 61 communicated with the steam inlet 4, the distribution hole pipe 61 is provided with a plurality of distribution air holes 62 for exhausting steam, and two end portions of the distribution hole pipe 61 are sealing structures. Through the design of this structure can effectually make steam distribution more even, be favorable to coil pipe mechanism's thermally equivalent simultaneously.

Based on the design of the above specific structure, the two ends of the distribution hole pipe 61 are sealed by using blind plates 63. More specifically, because the steam is sprayed out and usually carries liquid and partial foam, in order to realize that all the steam enters the heat exchange cavity, in a more specific design, a liquid baffle plate 64 is further arranged on the outer side of the distribution hole pipe 61, the liquid baffle plate 64 is provided with a plurality of air holes for the steam to pass through, and the liquid baffle plate 64 is fixedly assembled on the distribution hole pipe 61 through a support plate 65.

As a further design, in addition to the above design, more specifically, the liquid discharge port 5 is provided at a lower portion of the casing 1, and the steam inlet 4 is provided at a lower portion or an upper portion of the casing 1. Preferably, the steam inlet 4 is provided at a lower portion of the casing 1. According to the schematic of fig. 2, the coil mechanism is heated in the steam rising process, and after the liquid is cooled and liquefied, the liquid still has residual heat, and the coil is heated again in the dropping process, so that the secondary application of heat is realized.

In design, the steam comes from a steam generator (not shown in the figure, but the structure is a conventional structure), and more specifically, the liquid outlet 5 is communicated with the steam generator, so that the liquid can be recycled, and the generation and discharge of additional products in the whole system are avoided. Specifically, the drain port 5 is communicated with a drain pipe 15, and an automatic drain valve 16 is provided in the drain pipe 15.

Example 2

On embodiment 1's design basis, to the further design of coil pipe mechanism, more specifically, coil pipe mechanism includes first coil pipe 7 and second coil pipe 8, be provided with choke valve 9 between first coil pipe 7 and the second coil pipe 8, through choke valve 9 throttle step-down, heat absorption cooling. In the design, after the natural gas is heated, the natural gas is throttled and depressurized through the angle type throttle valve 9, absorbs heat and cools down, and then enters the second group of heat exchange coils again to be heated, so that the temperature and the pressure required by the process are achieved and are output from the outlet. Of course, as an alternative, the coil mechanism may be of an integral structure, but the design of the structure is not favorable for heating the whole natural gas, and in the pressure relief process of the natural gas, further heat absorption of the natural gas can be realized, and the pressure of the natural gas can still reach the target value after the natural gas is heated again.

In order to realize the better heating effect of natural gas, as more specific design, first coil pipe 7 sets up in the below of second coil pipe 8 to set up in the cavity of casing 1 inside, air inlet 2 sets up on first coil pipe 7, gas outlet 3 sets up on second coil pipe 8. In the design, the natural gas passage is fixed, namely from bottom to top, and meanwhile, the steam also flows from bottom to top, so that the heating contact time can be effectively realized, and the whole heating effect is ensured.

As a more specific design, in order to realize the control of the whole system, as a more specific design, the steam inlet 4 is connected with a steam pipeline 10;

a pressure regulator 11 and a pressure regulating valve 12 are arranged on the steam pipeline 10, and the pressure of the steam is controlled by controlling the pressure regulating valve 12 through the pressure regulator 11;

or/and a temperature regulator 13 and a temperature regulating valve 14 are arranged on the steam pipeline 10, and the temperature regulating valve 14 is controlled by the temperature regulator 13 to control the temperature of the natural gas heat exchange.

In the specific process description, high-temperature steam flows from a steam inlet 4 through a gas distribution mechanism 6 and a liquid baffle plate 64 and is uniformly distributed, the high-temperature steam with small specific gravity rises from bottom to top, the temperature of the high-temperature steam is reduced after the high-temperature steam is contacted with a heat exchange coil on the lower layer for heat exchange, the temperature of the high-temperature steam is reduced along with the rising of the steam for heat exchange, gas-phase steam is gradually changed into liquid-phase water mist, a large amount of latent heat is released, and phase-change heat exchange is formed. And (3) with the rising of the liquid-phase water mist for further heat exchange and cooling, forming water drops on the outer surface of the upper-layer coil pipe, accumulating the water drops into high-temperature water drops, allowing the water drops to fall under the action of gravity, further exchanging heat with the lower-layer heat exchange coil pipe for cooling, and finally forming cooling water, wherein the cooling water passes through the automatic drain valve 16, can be automatically discharged out of condensed water in the container, and flows back to a boiler heating system (steam generator) through the system for recycling.

Phase change heat transfer becomes liquid phase high temperature water droplet by gaseous phase vapor, releases a large amount of latent heats, carries out the heat exchange by high temperature water and low temperature natural gas again, and the totality passes the membrane coefficient very big, and heat transfer efficiency is high, and corresponding heat transfer area significantly reduces, and the device volume of equal power reduces greatly, and occupation space is little.

Example 3

On the basis of the design of the embodiment 2, as a more specific design for the design of the control system of the whole device, a temperature control system is shown in fig. 5, wherein a steam pipeline 10 is communicated with a steam inlet 4, and a temperature regulating valve 14 is arranged on the steam pipeline 10;

the temperature sensor 17 arranged at the air outlet 3, the temperature regulator 13 and the valve positioner 18 used for controlling the temperature regulating valve 14 are also included;

the thermostat 13 gives a signal to a valve positioner 18 and controls the thermostat 14 according to a detection signal of a temperature sensor 17.

In order to realize a non-power supply design, a mechanical structure is adopted in the design of the structure, and in a more specific design, the temperature regulator 13 is a pneumatic temperature regulator 13, the valve positioner 18 is a pneumatic valve positioner 18, the temperature regulating valve 14 is a pneumatic membrane regulating valve, and the temperature sensor 17 is an expansion type temperature sensor 17;

the pneumatic temperature regulator 13 is provided with an air inlet 2, and after the expansion type temperature sensor 17 senses the temperature of the fluid, the pneumatic temperature regulator 13 controls the size of an air pressure signal output to the pneumatic valve positioner 18, and the opening control of the pneumatic membrane regulating valve is realized through the pneumatic valve positioner 18.

In this design, the temperature sensor 17 is an expansion type temperature sensor 17, the temperature sensor 17 is arranged at the outlet of natural gas, and the expansion type temperature sensor 17 adopts the principle of expansion with heat and contraction with cold. Based on the principle of cold expansion and cold contraction, the expansion assembly is used for controlling the gas pressure in the pneumatic temperature regulator 13, and the gas pressure in the pneumatic temperature regulator 13 is transmitted to the pneumatic valve positioner 18, so that the whole steam input quantity control is controlled.

Specifically, the temperature sensor 17 of the pneumatic temperature regulator 13 is installed in the outlet pipe temperature sleeve of the heater, and the temperature sensor 17 senses the temperature change condition of the outlet fluid to change the air pressure signal output by the pneumatic temperature regulator 13 to the pneumatic valve positioner 18, so that the opening degree of the steam pneumatic film regulating valve is changed. When the outlet fluid temperature detected by the temperature sensor 17 is lower than the set value of the pneumatic temperature regulator 13, the opening of the pneumatic film regulating valve is opened to increase the steam supply; when the outlet fluid temperature is higher than the set value of the pneumatic temperature regulator 13, the opening of the pneumatic membrane regulating valve is reduced, and the steam supply amount is reduced.

More specifically, the working principle of the air-closed pneumatic membrane regulating valve is as follows: when the input pressure is increased, the film moves downwards to push the valve rod to move downwards to close the valve; when the input pressure is reduced, the film moves upwards to push the valve rod to move upwards to open the large valve; when the input pressure reaches the maximum measuring range, the valve is completely closed; when the input pressure is zero range, the valve is fully opened.

Example 4

As a more specific design, in addition to the design of embodiment 1, embodiment 2 or embodiment 3, a constant pressure steam pressure control system is provided, as shown in fig. 6, wherein the steam inlet 4 is communicated with a steam pipeline 10, and the steam pipeline 10 is provided with a pressure regulating valve 12;

and the pressure regulator 11 is communicated with the inside of the shell 1 through a sensing element, and the pressure regulating valve 12 is controlled through the detection of the internal steam pressure.

On the basis of the above specific structural design, in order to realize a design without a power supply, a mechanical structure is adopted in the design of the structure, and in a more specific design, the pressure regulator 11 is a pneumatic pressure regulator 11, the pressure regulating valve 12 is a pneumatic membrane regulating valve, and the sensing element is a bourdon tube;

the pneumatic pressure regulator 11 has an air inlet 2, and the pneumatic pressure regulator 11 detects the steam pressure through a Bourdon tube, and controls the output pressure signal of the pneumatic pressure regulator 11 through the change of the Bourdon tube, thereby controlling the opening degree of the pressure regulating valve 12.

As the specific design of the process, the pressure regulator 11 is communicated with the top of the shell 1 through a pressure guiding pipe 19, and the steam pressure is communicated with an induction element Bourdon tube of the position type pneumatic pressure regulator 11; the bourdon tube shrinks when the steam pressure decreases; the Bourdon tube expands when the steam pressure rises; when the steam pressure is greater than the high-limit set pressure of the pneumatic pressure regulator 11, the pneumatic pressure regulator 11 outputs a pneumatic signal with a pressure of zero range, so that the pressure regulating valve 12 is closed; when the steam pressure is lower than the lower limit set value pressure of the pneumatic pressure regulator 11, the regulator outputs the pneumatic signal pressure at full range, thereby opening the pressure regulating valve 12.

The working principle of the pneumatic membrane regulating valve of the air-open type is as follows: when the input pressure is in a full range, the film moves upwards to push the valve rod to move upwards, and the valve is completely opened; when the input pressure is zero range, the film moves downwards to push the valve rod to move downwards to close the valve.

In summary, the following steps:

1. the natural gas phase-change heat exchange device, the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device realize natural gas heating by adopting a mode of heating natural gas by steam, and water resources are relatively abundant when the steam is taken and particularly applied to an ocean drilling platform, and the surplus steam of the ocean drilling platform is fully utilized as a heat source to heat the natural gas, so that the energy consumption and the production cost can be effectively reduced;

2. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system applied to the natural gas phase-change heat exchange device are designed through the coil pipe, and the natural rising performance of steam is combined, so that the heat utilization of the steam can be effectively realized in the whole shell cavity, on one hand, the steam is condensed into water drops when meeting the condensation, the gas state is changed into the liquid state, a large amount of latent heat is released, and then the heat exchange is carried out between high-temperature water and low-temperature natural gas, so that the overall film transfer coefficient is very large, and the heat transfer efficiency is high; on the other hand, due to the high heat transfer coefficient of the phase change heat exchange, the corresponding heat exchange area is greatly reduced, the size of the device with the same power is greatly reduced, the occupied space is small, and the use advantage on the limited space of the ocean platform is obvious;

3. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device adopt dividing wall type heat exchange, surplus steam meets condensation and is condensed into water, an automatic drain valve is arranged on a condensed water pipeline, condensed water in a container can be automatically discharged and flows back to a boiler heating system through the system, the condensed water can be recycled, and the whole device meets the environment-friendly requirement of zero emission;

4. according to the natural gas phase-change heat exchange device, the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device, the steam distributor and the baffle are arranged through the steam inlet, so that direct erosion of high-temperature steam is prevented, the steam is uniformly distributed, the natural gas phase-change heat exchange device is fully contacted with the outer wall of the heat exchange coil, and the heat transfer effect is enhanced;

5. the natural gas phase-change heat exchange device and the temperature control system and the constant pressure system which are applied to the natural gas phase-change heat exchange device adopt the pneumatic temperature control system and the constant pressure system, control the opening and closing of the steam pressure source, are synchronous with the actual working condition, have high precision, sensitive action and quick response, and ensure that the technological parameters and the safe operation of a container are achieved; after the parameter setting is completed, the whole device can realize unattended operation, the working intensity of workers is reduced, the technical process has no open fire, no special requirement on electricity is required, the requirement on explosion-proof grade is not high, and the device is safer to use.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (14)

1. A natural gas phase-change heat exchange device is characterized in that: the steam-cooling type natural gas heat exchanger comprises a housing, the inside coil pipe mechanism that is used for the heat exchange that is provided with of casing, coil pipe mechanism is provided with air inlet and gas outlet in order to be used for the flow of natural gas, be provided with steam inlet and leakage fluid dram on the casing, steam enters into jar internal back and carries out the back cooling with the natural gas in the coil pipe and form liquid and follow the leakage fluid dram and discharge.

2. A natural gas phase change heat exchange unit according to claim 1, wherein: and a gas distribution mechanism is arranged in the shell where the steam inlet is positioned and used for diffusing steam.

3. A natural gas phase change heat exchange unit according to claim 2, wherein: the gas distribution mechanism comprises a distribution hole pipe communicated with the steam inlet, a plurality of distribution air holes are formed in the distribution hole pipe and used for exhausting steam, and two end portions of the distribution hole pipe are sealing structures.

4. A natural gas phase change heat exchange unit according to claim 3, wherein: and two end parts of the distribution hole pipe are sealed by adopting blind plates.

5. A natural gas phase change heat exchange unit according to claim 3, wherein: the outside of distribution hole pipe still is provided with the fender liquid board, the fender liquid board is provided with a plurality of gas pockets in order to be used for the passing through of steam, the fender liquid board passes through backup pad fixed mounting on the distribution hole pipe.

6. A natural gas phase change heat exchange unit according to any one of claims 1 to 5, wherein: the liquid outlet is arranged at the lower part of the shell, and the steam inlet is arranged at the lower part or the upper part of the shell.

7. A natural gas phase change heat exchange unit according to claim 1, wherein: the coil pipe mechanism comprises a first coil pipe and a second coil pipe, a throttle valve is arranged between the first coil pipe and the second coil pipe, and the throttle valve throttles pressure and absorbs heat to cool.

8. A natural gas phase change heat exchange unit according to claim 7, wherein: the first coil pipe is arranged below the second coil pipe and arranged in the cavity inside the shell, the air inlet is arranged on the first coil pipe, and the air outlet is arranged on the second coil pipe.

9. A natural gas phase change heat exchange unit according to claim 1, wherein: the steam inlet is connected with a steam pipeline;

a pressure regulator and a pressure regulating valve are arranged on the steam pipeline, and the pressure regulator controls the pressure regulating valve to control the pressure of the steam;

or/and a temperature regulator and a temperature regulating valve are arranged on the steam pipeline, and the temperature regulating valve is controlled by the temperature regulator to control the temperature of the heat exchange of the natural gas.

10. A natural gas phase change heat exchange unit according to claim 1, wherein: the liquid outlet is communicated with a liquid discharge pipe, and an automatic drain valve is arranged on the liquid discharge pipe.

11. A temperature control system for use in a natural gas phase change heat exchange device according to any one of claims 1 to 9, wherein: the steam inlet is communicated with a steam pipeline, and a temperature regulating valve is arranged on the steam pipeline;

the temperature sensor is arranged at the air outlet, the temperature regulator and the valve positioner are used for controlling the temperature regulator;

the temperature regulator gives a signal to the valve positioner through a detection signal of the temperature sensor and realizes the control of the temperature regulator valve.

12. A temperature control system according to claim 11, wherein: the temperature regulator is a pneumatic temperature regulator, the valve positioner is a pneumatic valve positioner, the temperature regulating valve is a pneumatic film regulating valve, and the temperature sensor is an expansion type temperature sensor;

the pneumatic temperature regulator is provided with an air inlet, and the expansion type temperature sensor changes the size of an air pressure signal output to the pneumatic valve positioner by the pneumatic temperature regulator after sensing the temperature of fluid, so that the pneumatic valve positioner realizes the opening control of the pneumatic film regulating valve.

13. A constant pressure steam pressure control system applied to a natural gas phase-change heat exchange device according to any one of claims 1 to 9, wherein: the steam inlet is communicated with a steam pipeline, and a pressure regulating valve is arranged on the steam pipeline;

the steam generator also comprises a pressure regulator, wherein the pressure regulator is communicated with the interior of the shell through a sensing element and controls the pressure regulating valve through detection of the steam pressure in the shell.

14. The constant pressure steam pressure control system as claimed in claim 13, wherein: the pressure regulator is a pneumatic pressure regulator, and the pressure regulating valve is a pneumatic film regulating valve;

the pneumatic pressure regulator is provided with an air inlet, detects the steam pressure through the Bourdon tube, and controls the output pressure signal of the pneumatic pressure regulator through the change of the Bourdon tube so as to control the opening degree of the pressure regulating valve.

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