CN204710072U - A kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling - Google Patents
A kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling Download PDFInfo
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- CN204710072U CN204710072U CN201520290004.8U CN201520290004U CN204710072U CN 204710072 U CN204710072 U CN 204710072U CN 201520290004 U CN201520290004 U CN 201520290004U CN 204710072 U CN204710072 U CN 204710072U
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Abstract
The utility model discloses a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling, be connected with natural gas input channel after the entrance point parallel connection of two drying towers, be connected with natural gas output channel after the port of export parallel connection of two drying towers, also comprise predrying tower, regeneration gas heater, regeneration gas subcooler, regeneration gas separator and LPG separator, being connected with natural gas input channel and regeneration gas heater respectively of predrying tower, regeneration gas heater is connected with the port of export of drying tower; Regeneration gas subcooler one end is connected with the entrance point of drying tower, the connection of the other end and regeneration gas separator, and regeneration gas separator is connected with natural gas input channel; LPG separator is connected with regeneration gas subcooler; The utility model carries out heat exchange by the outlet of LPG separator liquid phase with regeneration gas provides cold, reduces regeneration gas temperature, improves the whole efficiency of drying device, reach the object of cold recovery efficiency utilization.
Description
Technical field
This practicality newly belongs to the drying device in natural gas liquefaction process, particularly relates to a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling.
Background technology
LNG is exactly the English abbreviation of " liquefied natural gas " (Liquefied Natural Gas), the cryogenic liquid of its to be a kind of main component be methane (content more than 90%), ethane and a small amount of alkane, study carefully its essence, LNG is exactly a kind of novel energy form of natural gas through cryogenic refrigeration post liquefaction of gaseous state in fact.Natural gas is from the cryogenic liquefaction process of gaseous state liquefy, the all dirt mixed in natural gas when gas well gathers production accumulating can be made to become solid separate out, impurity can be removed for a full due clean, and one of the volume of " liquefied natural gas " six percentages being only homogenous quantities gaseous natural gas, greatly can save storage and transportation space.Due to LNG have that the large security of calorific value is high, the outstanding advantage such as cleanliness without any pollution and storage convenient transportation, become one of optimum energy that modern society can select for people.In recent years, with regard to global energy strategy: about LNG production technology and trade activity become increasingly active, just to become in world's oil and gas industry energy market a new focus, a lot of country in international trade all using LNG as preferred fuels, the important military energy substance of national defence that is also classified as had is laid in.But up to now, the energy resource structure of China is all based on coal for a long time, the proportion shared by natural gas is very little and be also extremely unbalanced to the exploitation of natural gas, is particularly also in the starting stage to the developmental research Commercial cultivation of LNG.In the process of liquefaction plant production LNG product, by heavy hydrocarbon (LPG can be produced in the technique of de-heavy hydrocarbon and cryogenic liquefying, lower same) as the byproduct producing LNG, and due to the separation temperature of LPG be-40 ~-80 DEG C, this wherein just can for the cold energy utilized containing having, and according to the difference of source of the gas component, the enrichment degree of cold energy also varies.It is reported: China is in the big-and-middle-sized LNG liquefaction plant (more than treating capacity 300,000 sides/sky) of building and go into operation and coastal LNG receiving station, part facility has been considered the cold energy contained in LNG is utilized idea and has been put to practice, but most LNG liquefaction plant does not all make effective recovery to producing the cold consumed in LPG product process.With regard to the processing method of LPG product, existing method is: make LPG and ambient air carry out heat exchange with air temperature type vaporizer and metallic conduit, the cold energy contained in LPG is all absorbed by associated media, be not effectively utilized, while causing energy waste, also can bring certain environmental problem due to the relation of low temperature.On the other hand, in the molecular sieve dehydration flow process of current LNG liquefaction plant, regeneration gas all adopts recirculated water to carry out condensation, and water requirement is comparatively large, moisture in regeneration gas can be made higher simultaneously, affect regeneration effect in the time that temperature is higher.If on the basis of circulating water condensing, one can be set up for regeneration gas and crossed cold link, just greatly can alleviate the low problem of regeneration efficiency.The utility model is wanted tentatively to address this problem in small-scale LNG liquefaction/LPG retracting device (below treating capacity 100,000 sides/sky) just.
Utility model content
In order to overcome the defect of above-mentioned prior art, the utility model provides a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling, carry out heat exchange by the outlet of LPG separator liquid phase with regeneration gas and cold is provided, thus reduce regeneration gas temperature, improve the whole efficiency of drying device, reach the object of cold recovery efficiency utilization.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling, comprise at least two drying towers, be connected with natural gas input channel after the entrance point parallel connection of described two drying towers, be connected with natural gas output channel after the port of export parallel connection of two drying towers, it is characterized in that: also comprise predrying tower, regeneration gas heater, regeneration gas subcooler, regeneration gas separator and LPG separator, the entrance point of described predrying tower is connected with natural gas input channel, the port of export of predrying tower is connected with the entrance point of regeneration gas heater, the port of export of regeneration gas heater is connected with the port of export of drying tower, the described shell side inlet of regeneration gas subcooler is connected with the entrance point of drying tower, and the shell-side outlet of regeneration gas subcooler is connected with the entrance point of regeneration gas separator, and the port of export of regeneration gas separator is connected with natural gas input channel, described LPG separator is connected with regeneration gas subcooler.
Also comprise regeneration condenser, described regeneration condenser is located between drying tower and regeneration gas subcooler, and the described entrance point of regeneration condenser is connected with the entrance point of drying tower, and the port of export of regeneration condenser is connected with the entrance point of regeneration gas subcooler.
The tube-side inlet of regeneration gas subcooler is connected with the liquid-phase outlet of LPG separator, and the tube side outlet of regeneration gas subcooler is connected with LPG efferent duct, and the input port of LPG separator is connected with LPG input pipe.
Described LPG separator is provided with control ball valve, and described LPG efferent duct is provided with LPG flowmeter, described control ball valve and LPG flow meter parameter chain.
Described regeneration gas subcooler shell side inlet, shell-side outlet are equipped with stop valve, and the outlet of regeneration gas subcooler tube-side inlet, tube side is equipped with cryogenic liquid stop valve.
Described natural gas input channel is provided with air intake control valve, the port of export of described regeneration gas separator is provided with regeneration air stream gauge, described regeneration air stream gauge is connected with the port of export of air intake control valve, the parametric linkage of regeneration air stream gauge and air intake control valve, regulates package unit Operation Conditions.
The entrance point of described drying tower and the port of export, and the entrance point of predrying tower and the port of export have been respectively equipped with the magnetic valve of absorption/regenerative process that drying tower and predrying tower switch mutually.
The utility model has the following advantages:
1, the utility model comprises predrying tower, regeneration gas heater, regeneration gas subcooler, regeneration gas separator and LPG separator, the entrance point of described predrying tower is connected with natural gas input channel, the port of export of predrying tower is connected with the entrance point of regeneration gas heater, and the port of export of regeneration gas heater is connected with the port of export of drying tower; The described shell side inlet of regeneration gas subcooler is connected with the entrance point of drying tower, and the shell-side outlet of regeneration gas subcooler is connected with the entrance point of regeneration gas separator, and the port of export of regeneration gas separator is connected with natural gas input channel; Described LPG separator is connected with regeneration gas subcooler, in dry run, the required thermal source of regeneration gas heating is provided by electric heater or conduction oil, its design feature is: the regeneration gas being rich in moisture after drying tower regeneration, heat exchange is carried out through regeneration gas subcooler and the isolated cryogenic product LPG of LPG separator, regeneration gas is made to reach temperature lower than room temperature, moisture in further reduction regeneration gas, while cascade utilization has been carried out to the cold in product LPG, play raising regeneration efficiency, shorten the effect of recovery time.Regeneration gas obtains and completes regenerating molecular sieve process through closed cycle from unstripped gas, does not additionally consume regeneration gas.
2, the utility model also comprises regeneration condenser, described regeneration condenser is located between drying tower and regeneration gas subcooler, the described entrance point of regeneration condenser is connected with the entrance point of drying tower, the port of export of regeneration condenser is connected with the entrance point of regeneration gas subcooler, first the regeneration gas being rich in moisture is the condenser cooling of refrigerant through recirculated water, removing portion of water, heat exchange is carried out again through regeneration gas subcooler and the isolated cryogenic product LPG of LPG separator, further raising regeneration efficiency, effectively removes the moisture in regeneration gas.
3, the tube-side inlet of regeneration gas subcooler of the present utility model is connected with the liquid-phase outlet of LPG separator, the tube side outlet of regeneration gas subcooler is connected with LPG efferent duct, the input port of LPG separator is connected with LPG input pipe, is conducive to the utilization of regeneration gas to LPG cold energy.
4, LPG separator described in the utility model is provided with control ball valve, and described LPG efferent duct is provided with LPG flowmeter, described control ball valve and LPG flow meter parameter chain, control LPG flow.
5, regeneration gas subcooler shell side inlet described in the utility model, shell-side outlet are equipped with stop valve, and regeneration gas subcooler tube-side inlet, pipe shell-side outlet are equipped with cryogenic liquid stop valve, for the safe operation of system.
6, natural gas input channel described in the utility model is provided with air intake control valve, the port of export of described regeneration gas separator is provided with regeneration air stream gauge, described regeneration air stream gauge is connected with the port of export of air intake control valve, the parametric linkage of regeneration air stream gauge and air intake control valve, the aperture of air intake control valve carries out timely adjustment by the flow parameter of regeneration air stream gauge.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Mark in figure: 1 is air intake control valve, 2 is regeneration air stream gauge, and 3A, 3B are drying tower, and 3C is predrying tower, 4 is regeneration gas heater, 5 is regeneration gas condenser, and 6 is regeneration gas subcooler, and 7 is regeneration gas separator, 8 is LPG separator, 9 is liquid level gauge, and 10 for controlling ball valve, and 11 is LPG flowmeter, 12A/B/C/D is blowoff valve, 13-1A ~ 13-4A, 13-1B ~ 13-4B, 13-5 ~ 13-8 is magnetic valve, 14/17/18 is stop valve, 15/16 is cryogenic liquid stop valve, and 19 is online water analyzer, and 20 is gas control valve not up to standard.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described further:
Embodiment 1
As shown in Figure 1, a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling, comprise at least two drying towers 3A, 3B, be connected with natural gas input channel after the entrance point parallel connection of described two drying towers, be connected with natural gas output channel after the port of export parallel connection of two drying towers (namely the valve pipeline of drying tower 3A and drying tower 3B and UNICOM configures in parallel, one in the process of adsorbing, another is in reproduced state, then double tower duty switches mutually, completes circulation).Also comprise predrying tower 3C, regeneration gas heater 4, regeneration gas subcooler 6, regeneration gas separator 5 and LPG separator 8, the entrance point of described predrying tower 3C is connected with natural gas input channel, the port of export of predrying tower 3C is connected with the entrance point of regeneration gas heater 4, and the port of export of regeneration gas heater 4 is connected with the port of export of drying tower 3A, 3B; The shell side inlet of described regeneration gas subcooler 6 is connected with the entrance point of drying tower 3A, 3B, and the shell-side outlet of regeneration gas subcooler 6 is connected with the entrance point of regeneration gas separator 7, and the port of export of regeneration gas separator 7 is connected with natural gas input channel; Described LPG separator 8 is connected with regeneration gas subcooler 6.The tube-side inlet of regeneration gas subcooler 6 is connected with the liquid-phase outlet of LPG separator 8, and the tube side outlet of regeneration gas subcooler 6 is connected with LPG efferent duct, and the input port of LPG separator 8 is connected with LPG input pipe.Device have employed three molecular sieve drying towers, wherein two drying towers 3A, 3B are that unstripped gas dehydrates, another drying tower 3C is that regeneration gas is done predrying, when the moisture of drying tower absorption close on saturated after, regeneration regime can be switched to, by enough dry regeneration gases, the moisture adsorbed in drying tower is taken away, thus realization is the function of gas dehydration continuously.The regeneration gas being rich in moisture flows through the shell side of regeneration gas condenser and regeneration gas subcooler successively, and the outlet of regeneration gas subcooler shell side is connected with the entrance of regeneration gas separator, and the gaseous phase outlet of regeneration gas separator is got back to drying tower front end and proceeded regeneration cycle.The liquid-phase outlet of regeneration gas separator leads to out-of-bounds blowdown.Regeneration gas subcooler tube-side inlet exports with LPG separator liquid phase and is connected, and the outlet of regeneration gas subcooler tube side will provide the LPG product of cold to deliver to upstream device.The absorption and regeneration function of three drying towers is automatically switched by 12 magnetic valves, is all provided with blowoff valve bottom three drying towers.In dry run, the required thermal source of regeneration gas heating is provided by electric heater or conduction oil.Its design feature is: the regeneration gas being rich in moisture after drying tower regeneration, first be the condenser cooling of refrigerant through recirculated water, heat exchange is carried out again through regeneration gas subcooler and the isolated cryogenic product LPG of LPG separator, regeneration gas is made to reach temperature lower than room temperature, moisture in further reduction regeneration gas, while cascade utilization has been carried out to the cold in product LPG, play raising regeneration efficiency, shorten the effect of recovery time.Regeneration gas obtains and completes regenerating molecular sieve process through closed cycle from unstripped gas, does not additionally consume regeneration gas.
Further improvement, also comprise regeneration condenser 5, described regeneration condenser 5 is located between drying tower 3A, 3B and regeneration gas subcooler 6, the entrance point of described regeneration condenser 5 is connected with the entrance point of drying tower 3A, 3B, and the port of export of regeneration condenser 5 is connected with the entrance point of regeneration gas subcooler 6.
Further, described LPG separator 8 be provided with control ball valve 10, described LPG efferent duct is provided with LPG flowmeter 11, described control ball valve and LPG flow meter parameter chain.
Further, described regeneration gas subcooler 6 shell side inlet, shell-side outlet are equipped with stop valve 17,18, and the port of export of regeneration gas separator 7 is provided with stop valve 14, and the outlet of regeneration gas subcooler tube-side inlet, tube side is equipped with cryogenic liquid stop valve 15,16.
Further, described natural gas input channel is provided with air intake control valve 1, the port of export of described regeneration gas separator 7 is provided with regeneration air stream gauge 2, described regeneration air stream gauge 2 is connected with the port of export of air intake control valve 1, regeneration air stream gauge 2 and the parametric linkage of air intake control valve 1, regulate package unit Operation Conditions.
Further, the entrance point of described drying tower 3A, 3B and the port of export, and the entrance point of predrying tower C and the port of export have been respectively equipped with the magnetic valve 13-5 ~ 13-8 of absorption/regenerative process that drying tower and predrying tower switch mutually.
Now the course of work of device is summarized as follows:
Upstream come natural-gas first access to plant be divided into two-way, wherein a road is through air intake control valve 1, remove drying tower 3A/B, under the adsorption selection of adsorbent, moisture in gas is absorbed, do not gone out from drying tower underflow by the natural gas adsorbed, through online water analyzer 19 analysis moisture, then lead to outside battery limit (BL).As natural gas water content amount is not up to standard, then online water analyzer 19 can control gas control valve 20 not up to standard, natural gas not up to standard is delivered to generating or antiaircraft loop.Drying tower 3A/B and relevant instrument valve pipeline are for being arranged in parallel, and when wherein a tower carries out adsorption process, another tower then carries out regenerative process simultaneously, after absorption reaches 8 hours, stop absorption being switched to regenerative process.
The natural-gas that another upstream, road is come is as regeneration gas, first enter predrying tower 3C and carry out drying, then through regeneration gas heater 4 heat temperature raising, enter in drying tower 3A/B to be in of regenerative process and carry out desorb, the water decomposition of adsorbing in drying tower is sucked out, regeneration air stream after desorb is after regeneration gas condenser 5, regeneration gas subcooler 6 carry out heat exchange with surrounding air and LPG liquid respectively, to regeneration gas separator 7, moisture is separated, then get back to the rear end of air intake control valve 1, complete regeneration gas circulation.
Drying tower 3A/B and predrying tower 3C is by magnetic valve 13-1A ~ 13-4A, and totally 12 magnetic valves such as 13-1B ~ 13-4B, 13-5 ~ 13-8 etc. control automatically, regulates each processes such as absorption and regeneration.
The LPG liquid of low temperature is through LPG separator 8, the BOG flashed off returns defeated time out-of-bounds through gas phase pipeline, the LPG of liquid phase, through cryogenic liquid stop valve 15 diffluence regeneration gas subcooler 6 tube side, reclaims after cold through heat exchange, flows to downstream through cryogenic liquid stop valve 16.LPG external transport pipeline is arranged LPG flowmeter 11, be convenient to the cumulative measurement carrying out product.
After device even running, the aperture of air intake control valve 1 is regulated by the flow parameter of regeneration air stream gauge 2.The liquid phase of LPG separator 8 controls ball valve 10 and carries out interlocking adjustment by the parameter of liquid level gauge 9.
Claims (7)
1. the drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling, comprise at least two drying tower (3A, 3B), described two drying tower (3A, be connected with natural gas input channel after entrance point parallel connection 3B), drying tower (3A, be connected with natural gas output channel after port of export parallel connection 3B), it is characterized in that: also comprise predrying tower (3C), regeneration gas heater (4), regeneration gas subcooler (6), regeneration gas separator (7) and LPG separator (8), the entrance point of described predrying tower (3C) is connected with natural gas input channel, the port of export of predrying tower (3C) is connected with the entrance point of regeneration gas heater (4), the port of export of regeneration gas heater (4) and drying tower (3A, port of export 3B) connects, the shell side inlet of described regeneration gas subcooler (6) is connected with the entrance point of drying tower (3A, 3B), the shell-side outlet of regeneration gas subcooler (6) is connected with the entrance point of regeneration gas separator (7), and the port of export of regeneration gas separator (7) is connected with natural gas input channel, described LPG separator (8) is connected with regeneration gas subcooler (6).
2. a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling according to claim 1, it is characterized in that: also comprise regeneration condenser (5), described regeneration condenser (5) is located between drying tower (3A, 3B) and regeneration gas subcooler (6), the entrance point of described regeneration condenser (5) is connected with the entrance point of drying tower (3A, 3B), and the port of export of regeneration condenser (5) is connected with the entrance point of regeneration gas subcooler (6).
3. a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling according to claim 1, it is characterized in that: the tube-side inlet of regeneration gas subcooler (6) is connected with the liquid-phase outlet of LPG separator (8), the tube side outlet of regeneration gas subcooler (6) is connected with LPG efferent duct, and the input port of LPG separator (8) is connected with LPG input pipe.
4. a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling according to claim 3, it is characterized in that: described LPG separator (8) is provided with and controls ball valve (10), described LPG efferent duct is provided with LPG flowmeter (11), described control ball valve (10) and LPG flowmeter (11) parametric linkage.
5. a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling according to claim 3, it is characterized in that: described regeneration gas subcooler (6) shell side inlet, shell-side outlet are equipped with stop valve (17,18), the outlet of regeneration gas subcooler (6) tube-side inlet, tube side is equipped with cryogenic liquid stop valve (15,16).
6. a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling according to claim 1, it is characterized in that: described natural gas input channel is provided with air intake control valve (1), the port of export of described regeneration gas separator (7) is provided with regeneration air stream gauge (2), described regeneration air stream gauge (2) is connected with the port of export of air intake control valve (1), regeneration air stream gauge (2) and the parametric linkage of air intake control valve (1), regulate package unit Operation Conditions.
7. a kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling according to claim 1, it is characterized in that: the entrance point of described drying tower (3A, 3B) and the port of export, the entrance point of predrying tower (3C) and the port of export have been respectively equipped with the magnetic valve of drying tower (3A, 3B) and the mutual absorption/regenerative process switched of predrying tower (3C).
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| CN201520290004.8U CN204710072U (en) | 2015-05-07 | 2015-05-07 | A kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling |
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| CN201520290004.8U CN204710072U (en) | 2015-05-07 | 2015-05-07 | A kind of drying device utilizing LPG cold energy to coagulate for regenerating molecular sieve air cooling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218595A (en) * | 2019-05-30 | 2019-09-10 | 中石化石油机械股份有限公司研究院 | A kind of three tower dehydration devices and technique of natural gas |
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2015
- 2015-05-07 CN CN201520290004.8U patent/CN204710072U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218595A (en) * | 2019-05-30 | 2019-09-10 | 中石化石油机械股份有限公司研究院 | A kind of three tower dehydration devices and technique of natural gas |
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Address after: The western part of central Sichuan city of Leshan province Elu Le 614000 No. 231 Patentee after: Sichuan Zhongyou music instrument energy equipment manufacturing Limited by Share Ltd Address before: 614013 Sichuan city of Leshan Province town Suji back street shop village seven Patentee before: Leshan Thermo Technical Instruments Co., Ltd. |