CN215404071U - Device for preventing methane liquefaction cold box from freezing and blocking - Google Patents
Device for preventing methane liquefaction cold box from freezing and blocking Download PDFInfo
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- CN215404071U CN215404071U CN202120738659.2U CN202120738659U CN215404071U CN 215404071 U CN215404071 U CN 215404071U CN 202120738659 U CN202120738659 U CN 202120738659U CN 215404071 U CN215404071 U CN 215404071U
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Abstract
The utility model provides a device for preventing a methane liquefaction cold box from being frozen and blocked, belonging to the technical field of medium-pressure methanation synthesis; the problem that a cold box is frozen and blocked due to the fact that moisture contained in gas exceeds the standard before the gas enters a cryogenic system at present is solved; the technical scheme includes that the device comprises a gas-liquid separator, wherein the gas-liquid separator comprises a closed cylinder body, an inlet, an outlet and a liquid outlet, a plurality of downward-inclined baffle plates are arranged on two sides of the inner wall of the gas-liquid separator in a staggered mode from top to bottom at intervals, the upper ends of the baffle plates are flat, the lower ends of the baffle plates are corrugated, the inlet is connected with a methanation water cooler, the outlet is connected with a dryer through a pipeline, one end, far away from the outlet, of the dryer is connected with a cryogenic system, an online moisture detector is arranged between the outlet and the dryer, an electromagnetic valve is arranged on the pipeline, the online moisture detector is electrically connected with a controller, and the electromagnetic valve is electrically connected with the controller; the utility model has the technical effects that the utility model can monitor the moisture in the gas in real time and avoid the freezing and blocking of the cold box.
Description
Technical Field
The utility model belongs to the technical field of medium-pressure methanation synthesis, and particularly relates to a device for preventing a methane liquefaction cold box from being frozen and blocked.
Background
In recent years, the export of coke oven gas in the coking industry of China becomes the key for the survival and development of independent coking enterprises, the hot topic of preparing natural gas through methanation of coke oven gas is greatly concerned by industry people, the energy results of China at present show that the methanol capacity is excessive, the supply and demand of natural gas are seriously insufficient, new clean energy is developed, the preparation of liquefied natural gas through methanation of coke oven gas is an important development direction, the investment is saved, the energy utilization rate is higher, the energy-saving effect is obvious, more obvious economic benefits and social benefits can be generated, and the important significance for promoting the sustainable development of the technology and industry of the coking industry is realized.
In the existing process of preparing liquefied natural gas by methanation of coke oven gas, due to the reasons of process operation and the like in the methanation process, the water content in the gas in a cryogenic system is possibly over standard, so that a cold box is frozen and blocked, and the problem of cold box freezing and blocking treatment is time-consuming and labor-consuming.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of the prior art, provides a device for preventing a methane liquefaction cold box from being frozen and blocked, and aims to solve the problem that the cold box is frozen and blocked because the moisture contained in the gas exceeds the standard before the gas enters a cryogenic system at present.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
The utility model provides a prevent methane liquefaction cooler from freezing stifled device, includes vapour and liquid separator, vapour and liquid separator includes confined barrel, be provided with entry, export and leakage fluid dram on the barrel, the crisscross baffling board that is provided with a plurality of downward slopings in top-down interval in vapour and liquid separator's inner wall both sides, the upper end of baffling board is the plane, and the shape of lower extreme is the corrugate, the entry linkage has the methanation water cooler, there is the desicator export through the pipe connection, the desicator is kept away from the one end of export is connected with cryogenic system, the export with be provided with online moisture detector between the desicator, be provided with the solenoid valve on the pipeline, online moisture detector electricity is connected with the controller, the solenoid valve with the controller electricity is connected.
Further, the dryer adopts a 3A molecular sieve drying agent.
Further, the baffle plates are uniformly arranged.
Compared with the prior art, the utility model has the following beneficial effects: the online moisture detector provided by the utility model can monitor the moisture in the gas in real time, can ensure the normal, safe and stable operation of the next process, and avoids the freezing and blocking of the cold box.
Drawings
The utility model is further described below with reference to the accompanying drawings;
FIG. 1 is a schematic view of a process for producing liquefied natural gas by methanation of coke oven gas;
FIG. 2 is a schematic view of a gas-liquid separator;
FIG. 3 is a schematic view of a baffle plate;
wherein, 1 is a second boiler feed water preheater, 2 is a super-fine purifier, 3 is a gas-gas mixer, 4 is a first-section preheater, 5 is a second-section preheater, 6 is a first-section start-up electric heater, 7 is a first-section methanation reactor, 8 is a steam water separator, 9 is a first-section steam generator, 10 is a second-section steam generator, 11 is a second-section methanation reactor, 12 is a second-section start-up electric heater, 13 is a second-section outlet 31 heat exchanger, 14 is a third-section methanation reactor, 15 is a third-section preheater B, 16 is a third-section preheater A, 17 is a circulating gas heater, 18 is a circulating gas compressor, 19 is a first boiler feed water preheater, 20 is a desalted water preheater, 21 is a first methanation water cooler, 22 is a second gas-liquid separator, 23 is a methanation water cooler, 24 is an online moisture detector 25, 26 is a dryer, 27 is a cryogenic system, the reference numeral 28 denotes a solenoid valve 28, 29 denotes a baffle plate, 30 denotes an inlet, 31 denotes an outlet, and 32 denotes a drain outlet.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings, it is to be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention, and the technical solutions of the present invention are described in detail with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereby.
The device for preventing the freezing blockage of the methane liquefaction cold box comprises a gas-liquid separator 24, as shown in figure 2, the gas-liquid separator 24 comprises a closed cylinder body, an inlet 30, an outlet 31 and a liquid discharge port 32 are arranged on the cylinder body, a plurality of downward-inclined baffle plates 29 are uniformly arranged on two sides of the inner wall of the gas-liquid separator 24 in a staggered mode from top to bottom at intervals, as shown in fig. 3, the upper end of the baffle 29 is a plane, the lower end is corrugated, the inlet 30 is connected with the methanation water cooler 23, the outlet 31 is connected with the dryer 26 through a pipeline, the dryer 26 adopts 3A molecular sieve drying agent, one end of the dryer 26 far away from the outlet 31 is connected with the cryogenic system 27, the online moisture detector 25 is arranged between the outlet 31 and the dryer 26, the pipeline is provided with the electromagnetic valve 28, the online moisture detector 25 is electrically connected with a controller, and the electromagnetic valve 28 is electrically connected with the controller.
The working principle of the gas-liquid separator 24 is that a gas-liquid two-phase mixture enters the cylinder from the inlet 30 and moves from bottom to top, when the gas is blocked by the baffle plate 29, the gas can flow back and move away, the liquid phase is attached to the wall of the baffle plate 29, because the lower end of the baffle plate 29 is corrugated, the flow direction at the corrugated part can change, the contact area between the liquid phase and the baffle plate 29 is increased, more liquid phases are blocked by the baffle plate 29, the gas-liquid separation effect is improved, the content of the liquid phase mixed in the gas phase is reduced, the liquid phase is converged under the action of gravity and is discharged from the liquid discharge port 32, the gas phase is discharged from the outlet 31, and because the upper end of the baffle plate 29 is a plane, the liquid phase on the lower wall of the upper baffle plate 29 can slide down smoothly.
As shown in figure 1, the working process of preparing the liquefied natural gas by methanation of the coke oven gas comprises the steps of enabling purified coke oven gas to enter a second boiler feed water preheater 1, exchanging heat to 170 ℃, enabling the purified coke oven gas to enter an ultra-fine purifier 2, and enabling the total sulfur at an outlet 31 to be less than or equal to 0.02 ppm; qualified coke oven gas is divided into two paths according to the proportion requirement, and the two paths are respectively sent to a first-stage methanation reactor 7 and a second-stage methanation reactor 11.
The coke oven gas of the demethanization first-stage methanation reactor 7 is firstly mixed with the circulating gas pressurized by the circulating compressor 18 in the gas-gas mixer 3, the mixed gas is heated by the first-stage preheater 4, the temperature of the mixed gas rises to 295-fold temperature of 325 ℃, the mixed gas is mixed with the process steam from the steam water separator 8, the temperature of the mixed gas rises to 290 ℃ after the mixed gas is heated by the first-stage power-on electric heater 6, and the mixed gas enters the first-stage methanation reactor 7 for methanation reaction.
The high-temperature gas from the first-stage methanation reactor 7 is firstly subjected to a first-stage steam generator 9 to produce a byproduct of saturated steam of 2.5Mpa, then the temperature is reduced to 320-355 ℃, and then the high-temperature gas is mixed with the purified coke oven gas from the other path of the ultra-fine purifier 2, the mixed gas is heated by a second-stage on-stream electric heater 12, the temperature of the mixed gas is controlled to be 250-300 ℃, and the methanation reaction is continuously carried out.
The high-temperature reaction gas (temperature-505 ℃) from the second-stage methanation reactor 11 firstly passes through a second-stage steam generator 10 to produce saturated steam with 2.5Mpa, then the temperature is reduced to 325-350 ℃, and then the high-temperature reaction gas enters a second-stage outlet 31 heat exchanger 13 to preheat process gas entering a third-stage methanation reactor 14; the gas from the heat exchanger 13 of the second-stage outlet 31 enters a first-stage preheater 4 and is heated to enter the mixed gas of the first-stage methanation reactor 7, the gas from the first-stage preheater 4 enters the second-stage preheater 5, and then passes through the circulating gas heater, the first boiler feed water preheater 19 and the desalted water preheater 20 in sequence to recover heat and reduce temperature, then the condensed water is separated by the first gas-liquid separator 24, enters the first methanation water cooler 21, is separated by the second gas-liquid separator 22, is divided into two paths, one path is sent to the recycle gas compressor for compression and pressure raising, then is sent to the gas mixer 3 by the recycle gas heater 17, the other path exchanges heat by the three-section preheater A16 and the three-section preheater B15, and the reaction gas enters the three-section methanation reactor 14 after exchanging heat with the heat exchanger 13 of the second-section outlet 31, enters the three-section preheater B15 and the three-section preheater A16 for exchanging heat, and enters the methanation water cooler 23.
The blender enters into vapour and liquid separator 24 from methanation water cooler 23, separate through vapour and liquid separator 24, liquid is discharged by leakage fluid dram 32, gaseous passing through the pipeline enters into cryrogenic system 27 after the desicator 26 is dried, online moisture detector 25 detects the moisture content that contains in the gas from the sample in the pipeline, when moisture content does not reach standard, online moisture detector 25 gives the controller with signal transmission, controller control solenoid valve 28 closes, gaseous transmission is cut off, so that the gas that moisture content exceeds standard enters into cryrogenic system 27 and causes the freezing stifled to the cold box, the manual work goes to the process before overhauing vapour and liquid separator 24, after the moisture content adjustment in the gas reaches standard, open solenoid valve 28 and normally work.
The gas-liquid separator 24 of the utility model improves the effect of separating gas phase from liquid phase, reduces the content of liquid phase mixed in the gas phase, and can ensure the normal safe and stable operation of the next process because the online moisture detector 25 monitors the moisture in the gas in real time, thereby preventing the gas with over-standard moisture from entering the deep cooling system 27.
While the utility model has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (3)
1. The utility model provides a prevent methane liquefaction cooler from freezing stifled device, its characterized in that, includes vapour and liquid separator, vapour and liquid separator includes confined barrel, be provided with entry, export and leakage fluid dram on the barrel, the crisscross baffling board that is provided with a plurality of downward slopings of inner wall both sides top-down interval of vapour and liquid separator, the upper end of baffling board is the plane, and the shape of lower extreme is the corrugate, the entry linkage has the methanation water cooler, there is the desicator export through the pipe connection, the desicator is kept away from the one end of export is connected with cryogenic system, the export with be provided with online moisture detector between the desicator, be provided with the solenoid valve on the pipeline, online moisture detector electricity is connected with the controller, the solenoid valve with the controller electricity is connected.
2. The device for preventing the freezing and blocking of the methane liquefaction cold box according to claim 1, wherein the dryer adopts a 3A molecular sieve drying agent.
3. The device for preventing the freezing blockage of the methane liquefaction cold box as claimed in claim 1, wherein the baffles are uniformly arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120738659.2U CN215404071U (en) | 2021-04-13 | 2021-04-13 | Device for preventing methane liquefaction cold box from freezing and blocking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120738659.2U CN215404071U (en) | 2021-04-13 | 2021-04-13 | Device for preventing methane liquefaction cold box from freezing and blocking |
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| Publication Number | Publication Date |
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| CN215404071U true CN215404071U (en) | 2022-01-04 |
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| CN202120738659.2U Active CN215404071U (en) | 2021-04-13 | 2021-04-13 | Device for preventing methane liquefaction cold box from freezing and blocking |
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- 2021-04-13 CN CN202120738659.2U patent/CN215404071U/en active Active
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